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Development of Magnetic Nanopartides with High Surface Anisotropy for High Density Recording

Research Project

Project/Area Number 13650331
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionTohoku University

Principal Investigator

KITAKAMI Osamu  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Associate Professor, 多元物質科学研究所, 助教授 (70250834)

Co-Investigator(Kenkyū-buntansha) SHIMADA Yutaka  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Professor, 多元物質科学研究所, 教授 (00006157)
OKAMOTO Satoshi  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Assistant Professor, 多元物質科学研究所, 助手 (10292278)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
Keywordsmagnetic memory / nanoparticles / thermal agitation / surface anisotropy / magnetic recording / hydrogenation
Research Abstract

We have studied magnetic surface anisotropy (MSA) at 3d transition metals (TM)/Pd, Pt, SiO_2 interfaces, and investigated the surface effect on the effective magnetic anisotropy of nanopartocles.
1. MSA at TM/Pd, Pt, interfaces The MSA strongly depends on the valence electron number of TM and reaches a maximum of 〜0.5 erg/cm^2 for TM = Co, which is consistent with the first principles calculation so far reportd. R is also found that addition of very small amount of rare earth elements (RE) into TM omsiderahly enhanoes the MSA due to the enhancement of orbital moment of Co.
2. MSA at TM/nonmagnetic oxide (SiO_2) The MSA at TM/SiO_2 strongly depends on the valence electron number of TM. With increasing the valence electron number from TM = Fe, Co to Ni the easy axis changes from the film normal to the film plane. The maximum perpendicular anisotropy reaches 0.4〜0.8 erg/cm2 for TM = Fe, Co, which is one order of magnitude higher than the magnetocrystalline anisotropy of bulk bcp Co. The dep … More endence of the MSA on the valence electron number of TM has been successfully explained by considering the electronic states of TM combined with SiO_2 at the interface.
3. MSA in TM/ nonmagnetic oxide granular films It is found that Fe/SiO_2 granular films (Fe particle size 5〜30 nm) exhibit very high coercibity of Hc〜500 Oe which is much higher than the anisotropy field (〜100 Oe) of bulk bccFe. By considering the measured MSA of 0.4 erg/cm^2 for Fe/SiO_2 we have quantitatively explained their large Hc and the particle size dependence. This result indicates that MSA effectively enhances the magnetic anisotropy of nanoparticles embedded in granular films.
4. MSA in TM nanoparticles We have prepared isolated TM (Fe, Co, Ni) nanopartides with the diameter of D = 5〜30 nm and determined their magnetic anisotropy by the newly developed anisotropy measurement method. It is found that all the nanoparticles exhibit strong uniaxial magnetic anisotropy compared with that of bulk materials. Such anisotropy enhanoement is mainly due to the surface effect. From the micromagnetic calculations and experiments, we have confirmed that the magnetic behaviors of the nanopartivles perfectly follows the coherent rotation (Stoner Wohlfarth) model when the particle diameter Dis less than 15 nm.
All the results mentioned above indicate that magnetic surface anisotropy significantly enhanoes the effective magnetic anisotropy of nanopartocles even when the bulk anisotropy is quite small. Such nanoparticles with large surface anisotropy would be very promising for development of ultra high density recording media. Less

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (124 results)

All Other

All Publications (124 results)

  • [Publications] K.Oikawa et al.: "Thermodynamic calculations of phase equilibria of Co-Cr-Pt ternary system and magnetically induced phase separation into the fcc and hcp phases"Journal of Magnetism and Magnetic Materials. 236. 220-233 (2001)

    • Description
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    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Koike et al.: "Magnetic block array for patterned magnetic media"Applied Physics Letters. 78. 784-786 (2001)

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      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] O.Kitakami et al.: "Low temperature ordering of Ll_o-CoPt thin films promoted by Sn, Pb, Sb, and Bi"Applied Physics Letters. 78. 1104-1106 (2001)

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    • Related Report
      2002 Final Research Report Summary
  • [Publications] J.W.Cai et al.: "Large coercivity and surface anisotropy in MgO/Co multilayer films"Physical Review B. 63. 104418-1-104418-7 (2001)

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      2002 Final Research Report Summary
  • [Publications] T.Ito et al.: "Enhanced phase separation of magnetic granular films"Journal of Magnetism and Magnetic Materials. 235. 165-168 (2001)

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      2002 Final Research Report Summary
  • [Publications] 及川勝成 他: "Co基合金の磁気的に誘起される2相分離に関する熱力学計算(総説)"日本応用磁気学会誌. 25. 478-485 (2001)

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      2002 Final Research Report Summary
  • [Publications] 島田寛 他: "白金族磁性合金の高密度記録媒体および高機能磁気素子への応用(解説)"日本金属学会報まてりあ. 40. 247-251 (2001)

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      2002 Final Research Report Summary
  • [Publications] 島田寛: "ナノスケール磁性体の現状と問題点(解説)"日本金属学会報まてりあ. 40. 770-773 (2001)

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      2002 Final Research Report Summary
  • [Publications] 北上修 他: "Ll_o-(Co, Fc)Ptナノ構造薄膜媒体の開発に向けて(解説)"日本金属学会報まてりあ. 40. 786-791 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] N.Kikuchi et al.: "Magnetic anisotropy and behaviors of Fe nanoparticles"IEEE Transactions on Magnetics. 37. 2082-2084 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Ibusuki et al.: "Magnetic anisotropy and behaviors of Fe nanoparticles"IEEE Transactions on Magnetics. 37. 2223-2225 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Ibusuki et al.: "Synthesis of CO_<1-x>Pt_x alloy fine particles with high coercivity"IEEE Transactions on Magnetics. 37. 1295-1297 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Ibusuki et al.: "Magnetic characteiization of Co-Pt particles produced by sputtering (Invited)"Scripta Materialia. 44. 1327-1331 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] V.Novosad et al.: "Nucleation and annihilation of magnetic vortices in sub-micron FeNi dots"IEEE Transactions on Magnetics. 37. 2088-2090 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.endo et al.: "Lowering of ordering temperature for fct-FePt in Fe/Pt multilayers"Journal of Applied Physics. 89. 7065-7068 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S.Okamoto et al.: "Enhancement of surface anisotropy of Co/Pt, Pd multilayers by Sm addition"Journal of Applied Physics. 90. 4085-4088 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] O.Kitakami et al.: "On magnetization reversal of Co-Cr films with perpendicular anisotropy"Japanese Journal of Applied Physics. 40. 4019-4022 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Oikawa et al.: "Prediction of magnetically induced phase separation in Co-Cr-based magnetic recording media"Applied Physics Letters. 79. 644-646 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Yamaguchi et al.: "Effects of B and C on the ordering of L1_o-CoPt thin films"Applied Physics Letters. 79. 2001-2003 (2001)

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      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] N.Kikuchi et al.: "Vertical bi-stable switching of spin vortex in a circular magnetic dot"Journal of Applied Physics. 90. 6548-6459 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 遠藤恭 他: "多層化によるFe-PtL1_o相の低温合成"日本応用磁気学会誌. 25. 835-838 (2001)

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      「研究成果報告書概要(和文)」より
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      2002 Final Research Report Summary
  • [Publications] 岡本聡 他: "水素雰囲気中のPd/Co/Pd三層膜の磁気特性"日本応用磁気学会誌. 25. 839-842 (2001)

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      2002 Final Research Report Summary
  • [Publications] 阪上博充 他: "MgO下地膜上のFGPt極薄膜の初期成長過程"日本応用磁気学会誌. 25. 847-850 (2001)

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      2002 Final Research Report Summary
  • [Publications] 菊池伸明 他: "Co/Pd人工格子ドットの磁気特性"日本応用磁気学会誌. 25. 859-862 (2001)

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    • Related Report
      2002 Final Research Report Summary
  • [Publications] V.Novosad et al.: "Effect of interdot magnetostatic interaction on magnetization reversal in circular dot arrays"Physical Review B. 65. 060402-1-060402-4 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Shinia et al.: "Magnetization reversal in magnetostatically coupled dot arrays"Journal of Applied Physics. 91. 6952-6954 (2002)

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      2002 Final Research Report Summary
  • [Publications] S.Okamoto, et al.: "CheinicaL-ordcr-dcpendcnt magnetic anisotropy and exchange stiffness constant of FePt(001) epitaxial films"Physical Review B. 66. 024413-1-024413-9 (2002)

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      2002 Final Research Report Summary
  • [Publications] K.Oikawa et al.: "Magnetically induced two-phase separation in Co-Ge and Co-Si systems"Journal of Magnetism and Magnetic Materials. 239. 409-411 (2002)

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  • [Publications] S.Okamoto et al.: "Enhancement of magnetic anisotropy of hydrogenated Pd/CO/Pd trilayers"Journal of Magnetism and Magnetic Materials. 239. 313-315 (2002)

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  • [Publications] T.Saito, et al.: "Grain growth and L1_o ordering in FePt-SiO_2 granular film"Journal of Magnetism and Magnetic Materials. 239. 310-312 (2002)

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  • [Publications] K.Oikawa et al.: "Thermodynamic calculations of the effect of B and Ta on magnetically induced phase separation in Co-Cr-Pt alloys"Applied Physics Letters. 80. 2704-2706 (2002)

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  • [Publications] O.Kiakanii et al.: "A simple analysis for magnetic behaviors of exchange-coupled granular/continuous perpendicular magnetic recording media"Japanese Journal of Applied Physics. 41. L455-L457 (2002)

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  • [Publications] 甲野藤真 他: "高密度パターンドメディア用磁性微粒子アレイの作製"日本応用磁気学会誌. 26. 243-247 (2002)

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      2002 Final Research Report Summary
  • [Publications] 宮崎孝道 他: "Bi下地によるFePt規則相の低温合成"日本応用磁気学会誌. 26. 430-433 (2002)

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      2002 Final Research Report Summary
  • [Publications] H.Shima, et al.: "Pinning of magnetic vortex in microfabricated permailoy disk"Journal of Applied Physics. 92. 1473-1476 (2002)

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      2002 Final Research Report Summary
  • [Publications] 菊池伸明 他: "スピンボルテクスのbi-stable磁化反転(解説)"日本応用磁気学会誌. 26. 188-194 (2002)

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      2002 Final Research Report Summary
  • [Publications] 北上修 他: "L1_o-Fept微粒子薄膜の作製(解説)"日本応用磁気学会誌. 26. 1047-1053 (2002)

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      2002 Final Research Report Summary
  • [Publications] 岡本聡 他: "パターンドメディアの技術動向(解説)"マテリアルステージ. 2. 1-6 (2002)

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      2002 Final Research Report Summary
  • [Publications] A.Yoshihara, et al.: "Brillouin light scattering from spin waves in epitaxial hcp Co films"Physical Review B. 67. 134435-1-134435-7 (2003)

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      2002 Final Research Report Summary
  • [Publications] S.Okanioto, et al.: "Size dependence of magnetic properties and switching behavior in FePt L1_o nanopatticles"Physical Review B. 67. 094422-1-094422-7 (2003)

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  • [Publications] O.Kitakami, et al.: "Energy barrier enhanced by higher-order magnetic anisotropy terms"Japanese Journal of Applied Physics. 42. L455-L457 (2003)

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      2002 Final Research Report Summary
  • [Publications] N.Kikuchi, et al.: "Sensitive detection of irreversible switching in a single FePt nano-sized dot"Applied Physics Letters. (in press). (2003)

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  • [Publications] S.Okamoto, et al.: "Anisotropy field of FePt L1_o nanoparticles controlled by a very thin Pt layer"Applied Physics Letters. (in press). (2003)

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  • [Publications] T.Miyazaki, et al.: "Fabrication of two-dimensional assembly of L1_o FePt"Journal of Applied Physics. (in press). (2003)

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      2002 Final Research Report Summary
  • [Publications] 北上修 他: "磁気記録媒体の基礎解析(招待)"日本応用磁気学会研究会資料「磁気ストレージ技術の趨勢はどこに」. 128. 93-103 (2003)

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      2002 Final Research Report Summary
  • [Publications] 岡木聡 他: "磁性体の熱揺らぎ評価(解説)"日本金属学会報まてりあ. (in press). (2003)

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      2002 Final Research Report Summary
  • [Publications] K. Oikawa et al.: "Themodynamic calculations of phase equilibria of Co-Cr-Pt ternary system and magnetically induced phase separation into the fcc and hdp phases"Journal of Magnetism and Magnetic Materials. 236. 220-233 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Koike et al.: "Magbetic block array for patterned magnetic media"Applied Physics Letters. 78. 784-786 (2001)

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    • Related Report
      2002 Final Research Report Summary
  • [Publications] O. Kitakami et al.: "Low temperature ordering of LI0-CoPt thin films promoted by Sn, Pb, Sb, and Bi"Applied Physics Letters. 78. 1104-1106 (2001)

    • Description
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    • Related Report
      2002 Final Research Report Summary
  • [Publications] J. W. Cai et al.: "Large coercivity and surface anisotropy in MgO/Co multilayer films"Physical Review B. 63. 104418-1-7 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Ito et al.: "Enhanced phase separation of magnetic granular film"Journal of Magnetism and Magnetic Materials. 235. 165-168 (2001)

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    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Oilawa et al.: "Thermodynamic calculation of magnetically induced phase separation in Co based alloys (Review article)"Journal of Magnetics Society in Japan. 25. 478-485 (2001)

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      2002 Final Research Report Summary
  • [Publications] Y. Shimada et al.: "Application of platinum group magnetic alloys to high density magnetic recording media and high performance magnetic devices (Review article)"Materia Japan. 40. 247-251 (2001)

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  • [Publications] Y. Shimada et al.: "Recent researches and developments of nanostructured ferromagnets with highd density memory feasibility (Review article)"Materia Japan. 40. 770-773 (2001)

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      2002 Final Research Report Summary
  • [Publications] O. Kitakmi et al.: "For development of nanostructured LI0 (Co, Fe)-Pt thin Film media (Review article)"Materia Japan. 40. 786-791 (2001)

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  • [Publications] N. Kikuchi et al.: "Vertical magnetization process in sub-micron permalloy dots"IEEE Transactions on Magnetics. 37. 2082-2084 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Ibusuki et al.: "Magnetic anisotropy and behaviors of Fe nanoparticles"IEEE Transactions on Magnetics. 37. 2223-2225 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Ibusuki et al.: "Synthesis of Co1-xPtx alloy fine particles with high coercivity"IEEE Transactions on Magnetics. 37. 1295-1297 (2001)

    • Description
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    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Ibusuki et al.: "Magnetic characterization of Co-Pt particles produced by sputtering (invited)"Scripta Materialia. 44. 1327-1331 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] V. Novosad et al.: "Nucleation and annihilation of magnetic vortices in sub-micron FeNi dots"IEEE Transactions on Magnetics. 37. 2088-2090 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Endo et al.: "Lowering of ordering temperature for fct-FePt in Fe/Pt multilayers"Journal of Applied Physics. 89. 7065-7068 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Okamoto et al.: "Enhancement of surface anisotropy of Co/Pt, Pd multilayers by Sm addition"Journal of Applied Physics. 90. 4085-4088 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] O. Kitakami et al.: "On magnetization reversal of Co-Cr films with perpendicular anisotropy"Japanese Journal of Applied Physics. 40. 4019-4022 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Oikawa et al.: "Prediction of magnetically induced phase separation in Co-Cr-based magnetic recording media"Applied Physics Letters. 79. 644-646 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Yamaguchi et al.: "Effects of B and C on the ordering of LI0-CoPt thin films"Applied Physics Letters. 79. 2001-2003 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Kikuchi et al.: "Vertical bi-stable switching of spin vortex in a circular magnetic dot"Journal of Applied Physics. 90. 6548-6549 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Endo et al.: "Low temperature LI0 formation of Fe/Pt multilayers"Journal of Magnetics Society in Japan. 25. 835-838 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Okamoto et al.: "Magnetic properties of Pd/Co/Pd trilayers in hydrogen gas atmosphere"Journal of Magnetics Society in Japan. 25. 839-842 (2001)

    • Description
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      2002 Final Research Report Summary
  • [Publications] H. Sakaue et al.: "Initial growth process for FePt ultra-thin films on MgO underlayers"Journal of Magnetics Society in Japan. 25. 847-850 (2001)

    • Description
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      2002 Final Research Report Summary
  • [Publications] N. Kikuchi et al.: "Magnetic properties of Co/Pt multiplayer dots"Journal of Magnetics Society in Japan. 25. 859-862 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] V. Novosad et al.: "Effect of interdot magnetostatic interaction on magnetization reversal in circular dot arrays"Physical Review B. 65. 060402-1-4 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Shima et al.: "Magnetization reversal in magnetostatically coupled dot arrays"Journal of Applied Physics. 91. 6952-6954 (2002)

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    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Okamoto et al.: "Chemical-order-dependent magnetic anisotropy and exchange stiffiness constant of FePt(001) epitaxial films"Physical Review B. 66. 024413-1-9 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Oikawa et al.: "Magnetically induced two-phase separation in Co-Ge and Co-Si systems"Journal of Magnetism and Magnetic Materials. 239. 409-411 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Okamoto et al.: "Enhancement of magnetic anisotropy of hydrohenated Pd/Co/Pd trilayers"Journal of Magnetism and Magnetic Materials. 239. 313-315 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Saito et al.: "Grain growth and LI0 ordering in FePt-SiO2 granular film"Journal of Magnetism and Magnetic Materials. 239. 310-312 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Oikawa et al.: "Thermodynamic calculations of the effect of B and Ta on magnetically induced phase separation in Co-Cr-Pt alloys"Applied Physics Letters. 80. 2704-2706 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] O. Kitakami et al.: "A Simple analysis for magnetic behaviors of exchange-coupled granular/continuous perpendicular magnetic recording"Japanese Journal of Applied Physics. 41. 455-457 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Konoto et al.: "Fabrication of a magnetic block array for high-density patterned media"Journal of Magnetics Society in Japan. 26. 243-247 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Miyazaki et al.: "Low-temperature formation of order phase in FePt film with Bi underlayer"Journal of Magnetics Society in Japan. 26. 430-433 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] N. Kikuchi et al.: "Vertical magnetization process of spin-vortex structure (Review article)"Journal of Magnetics Society in Japan. 26. 188-194 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] O. Kitakami et al.: "Fabrication of LI0 FePt nanoparticles (Review article)"Journal of Magnetics Society in Japan. 26. 1047-1053 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Okamoto et al.: "Recent advances in patterned media (Review article)"Material Stage. 2. 1-6 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Shima et al.: "Pinning of magnetic vortex in microfabricated permalloy disk"Journal of Applied Physics. 92. 1473-1476 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A. Yoshihara et al.: "Brilloin light scattering from spin waves in epitaxial bcp Co films"Physical Review B. 67. 134435-1-7 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Okamoto et al.: "Size dependence of magnetic properties and switching behavior in FePtLI0 nanoparticles"Physical Review B. 67. 094422-1-7 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] O. Kitakami et al.: "Energy barrier enhanced by higher-order magnetic anisotropy terms"Japanese Journal of Applied Physics. 42. 455-457 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] N. Kikuchi et al.: "Sensitive detection of irreversible switching in a single FePt nano-sized dot"Applied Physics Letters. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Okamoto et al.: "Anisotropy field of FePtLI0 nanoparticles controlled by a very thin Pt layer"Applied Physics Letters. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Miyazaki et al.: "Fabrication of two-dimensional assembly of LI0 FePt"Journal of Applied Physics. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] O. Kitakami et al.: "Basic analysis of magnetic recording media (Invited)"Journal of Magnetics Society in Japan "Future trend in storage technology". 128. 93-103 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Okamoto et al.: "Evaluation of thermal fluctuation in magnetic particles (Review article)"Materia Japan. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] V.Novosad, et al.: "Effect of interdot magnetostatic interaction on magnetization reversal in circular dot arrays"Physical Review B. 65. 060402-1-060402-4 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Shima, et al.: "Magnetization reversal in magnetostatically coupled dot arrays"Journal of Applied Physics. 91. 6952-6954 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Okamoto, et al.: "Chemical-order-dependent magnetic anisotropy and exchange stiffness constant of FePt(001)epitaxial films"Physical Review B. 66. 024413-1-024413-9 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Oikawa, et al.: "Magnetically induced two-phase separation in Co-Ge and Co-Si systems"Journal of Magnetism and Magnetic Materials. 239. 409-411 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Okamoto, et al.: "Enhancement of magnetic anisotropy of hydrogenated Pd/Co/Pd trilayers"Journal of Magnetism and Magnetic Materials. 239. 313-315 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Saito, et al.: "Grain growth and L1_0 ordering in FePt-SiO_2 granular film"Journal of Magnetism and Magnetic Materials. 239. 310-312 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Oikawa, et al.: "Thermodynamic calculations of the effect of B and Ta on magnetically induced phase separation in Co-Cr-Pt alloys"Applied Physics Letters. 80. 2704-2706 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] O.Kitakami, et al.: "A simple analysis for magnetic behaviors of exchange-coupled granular/continuous perpendicular magnetic recording media"Japanese Journal of Applied Physics. 41. L455-L457 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 甲野藤真他: "高密度パターンドメディア用磁性微粒子アレイの作製"日本応用磁気学会誌. 26. 243-247 (2002)

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      2002 Annual Research Report
  • [Publications] 宮崎孝道他: "Bi下地によるFePt規則相の低温合成"日本応用磁気学会誌. 26. 430-433 (2002)

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      2002 Annual Research Report
  • [Publications] H.Shima, et al.: "Pinning of magnetic vortex in microfabricated permalloy disk"Journal of Applied Physics. 92. 1473-1476 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 菊池伸明他: "スピンボルテクスのbi-stable磁化反転(解説)"日本応用磁気学会誌. 26. 188-194 (2002)

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      2002 Annual Research Report
  • [Publications] 北上修他: "L1_0-FePt微粒子薄膜の作製(解説)"日本応用磁気学会誌. 26. 1047-1053 (2002)

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  • [Publications] 岡本聡他: "パターンドメディアの技術動向(解説)"マテリアルステージ. 2. 1-6 (2002)

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  • [Publications] Y.Yoshihara, et al.: "Brillouin light scattering from spin waves in epitaxial hcp Co films"Physical Review B. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Okamoto, et al.: "Size dependence of magnetic properties and switching behavior in FePt L1_0 nanoparticles"Physical Review B. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] N.Kikuchi, et al.: "Sensitive detection of irreversible switching in a single FePt nano-sized dot"Applied Physics Letters. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Okamoto, et al.: "Anisotropy field of FePt L1_0 nanoparticles controlled by a very thin Pt layer"Applied Physics Letters. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] O.Kitakami, et al.: "Energy barrier enhanced by higher-order magnetic anisotropy terms"Japanese Journal of Applied Physics. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Miyazaki, et al.: "Fabrication of two-dimensional assembly of L1_0 FePt"Journal of Applied Physics. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 北上修他: "磁気記録媒体の基礎解析(招待)"日本応用磁気学会研究会資料 「磁気ストレージ技術の趨勢はどこに」. 128. 93-103 (2003)

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  • [Publications] 岡本聡他: "磁性体の熱揺らぎ評価(解説)"日本金属学会報まてりあ. (in press). (2003)

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  • [Publications] J.W.Cai et al.: "Large coercivity and surface anisotropy in MgO/Co multilayer films"Physical Review B. 63. 104418-1 (2001)

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      2001 Annual Research Report
  • [Publications] T.Ibusuki et al.: "Magnetic anisotropy and behaviors of Fe nanoparticles"IEEE Transactions on Magnetics. 37・4. 2223-2225 (2001)

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      2001 Annual Research Report
  • [Publications] T.Ibusuki et al.: "Synthesis of Co_<1-x>Pt_x alloy fine particles with high coercivity"IEEE Transactions on Magnetics. 37・4. 1295-1297 (2001)

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      2001 Annual Research Report
  • [Publications] T.Ibusuki et al.: "Magnetic characterization of Co-Pt particles produced by sputtering (Invited Paper)"Scripta Materialia. 44・8/9. 1327-1331 (2001)

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      2001 Annual Research Report
  • [Publications] S.Okamoto et al.: "Enhancement of surface anisotropy of Co/Pt, Pd multilayers by Sm addition"Journal of Applied Physics. 90・8. 4085-4088 (2001)

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      2001 Annual Research Report
  • [Publications] 菊地伸明 他: "Co/Pd人工格子ナノドットの磁気特性"日本応用磁気学会誌. 25・4. 859-862 (2001)

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      2001 Annual Research Report
  • [Publications] 岡本聡 他: "水素雰囲気中のPd/Co/Pd三層膜の磁気特性"日本応用磁気学会誌(印刷中). 25・4. 839-842 (2001)

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      2001 Annual Research Report
  • [Publications] V.Novosad et al.: "Effect of interdot magnetostatic interaction on magnetization reversal in circular dot arrays"Physical Review B. 65・. 060402-1-060402-4 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Okamoto et al.: "Enhancement of magnetic anisotropy of hydrogenated Pd/Co/Pd trilayers"Journal of Magnetism and Magnetic Materials. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 菊地伸明 他: "スピンボルテクスのbi-stable磁化反転(解説)"日本応用磁気学会誌. 26・4(印刷中). (2002)

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      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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