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Development and Application cf Bistability in Molecule-based Magnetic Mterials

Research Project

Project/Area Number 13304054
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 機能・物性・材料
Research InstitutionNagoya University

Principal Investigator

AWAGA Kunio  Nagoya University, Dept.of Chem., Prof., 大学院・理学研究科, 教授 (10202772)

Co-Investigator(Kenkyū-buntansha) FUJITA Wataru  Nagoya University, Research Center of Materials Science, Research Associate, 物質科学国際研究センター, 助手 (50292719)
和田 信雄  名古屋大学, 大学院・理学研究科, 教授 (90142687)
Project Period (FY) 2001 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥53,820,000 (Direct Cost: ¥41,400,000、Indirect Cost: ¥12,420,000)
Fiscal Year 2004: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2003: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2002: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
Fiscal Year 2001: ¥31,590,000 (Direct Cost: ¥24,300,000、Indirect Cost: ¥7,290,000)
KeywordsMolecular magnetism / Bistability / nanomagnet / Single Molecule Magnet / 双安定性 / 分子磁性体 / 有機ラジカル / 高スピン金属クラスター / 量子効果
Research Abstract

The science and technology of spin electronic devices have attracted much interest. In this project, we developed molecule-based magnetic materials for future spintronics.
1)Thiazyl radicals possess chemical stability and strong intermolecular interactions. We carried out a systematic study, namely, chemical syntheses, structural analyses, and physical measurements on this radical family, and discovered room-temperature magnetic bistability, photo-induced phase transition, organic ferromagnetism, etc.
2)Development of molecular-/nano-magnets is a key issue for spintronics. Some of transition-metal cluster complexes exhibit a hysteresis loop on magnetization curve, so that they are called single molecule magnets(SMM). In this project, we performed chemical modifications on SMM, in order to elucidate the magneto-structural correlation and to control the classical and quantum magnetic relaxations. The magneto-structural correlation in SMM was revealed.
We also developed synthesis of novel nanomagnets. We succeeded in uniform coating of polystyrene beads (O.D.300-1000 nm) with cobalt hydroxides, and obtained spherical hollow nanomagnets of fee Co and spinel Co_3O_4.

Report

(5 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (33 results)

All 2004 2002 Other

All Journal Article (17 results) Publications (16 results)

  • [Journal Article] Crystal structure and magnetic properties of a thiazyl organic ferromagnet, BBDTA・GaCl_4 with T_c=7.0 K2004

    • Author(s)
      W.Fujita, K.Awaga
    • Journal Title

      Chem.Phys.Lett. 388

      Pages: 186-189

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Packing Motifs and Magneto-Structural Correlations in Crystal structures of Metallo-Tetrakis(1,2,5-thiadiazole)porphyrazine Series, TTDPzM(M=H_2,Fe,Co,Ni,Cu,Zn)2004

    • Author(s)
      Y.Suzuki, M.Fujimori, H.Yoshikawa, K.Awaga
    • Journal Title

      Chem.Euro.J. 10

      Pages: 5158-5164

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Structure and magnetic properties of single-molecule magnet [Mn_<11>CrO_<12>(O_2CCH_3)_<16>(H_2O)_4]・2CH_3COOH・4H_2O : Magnetization manipulation and dipolar-biased tunneling in Mn11Cr/Mn12 mixed crystal2004

    • Author(s)
      H.Hachisuka, K.Awaga, T.Yokoyama, T.Kubo, T.Goto, H.Nojiri
    • Journal Title

      Phys.Rev.B 70

      Pages: 104427-104427

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] "Preparation and Magnetic Properties of Hollow Nano-Spheres of Cobalt and Cobalt Oxide : Drastic Cooling-Field Effects on Remnant Magnetization of Antiferromagnet2004

    • Author(s)
      H.Yoshikawa, K.Hayashida, Y.Kozuka, A.Horiguchi, K.Awaga, S.Bandow, S.Iijima
    • Journal Title

      Appl.Phys.Lett. 85

      Pages: 5287-5289

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Crystal structure and magnetic properties of a thiazyl organic ferromagnet, BBDTA-GaCl_4 with T_c=7.0 K2004

    • Author(s)
      W.Fujita W, K.Awaga
    • Journal Title

      Chem.Phys.Lett. 388

      Pages: 186-189

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Packing Motifs and Magneto-Structural Correlations in Crystal structures of Metallo-Tetrakis(1,2,5-thiadiazole)porphyrazine Series, TTDP zM (M=H_2,Fe,Co,Ni,Cu,Zn)2004

    • Author(s)
      Y.Suzuki, M.Fujimori, H.Yoshikawa, K.Awaga
    • Journal Title

      Chem.Euro.J. 10

      Pages: 5158-5164

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Structure and magnetic properties of single-molecule magnet [Mn_<11> CrO_<12>(O_2CCH_3)_<16>(H_2O)_4]-2CH_3COOH・4H_2O : Magnetization manipulation and dipolar-biased tunneling in Mn_<11>Cr/Mn12 mixed crystal2004

    • Author(s)
      H.Hachisuka, K.Awaga, T.Yokoyama, T.Kubo, T.Goto, H.Nojiri
    • Journal Title

      Phys.Rev.B 70

      Pages: 104427-104427

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Preparation and Magnetic Properties of Hollow Nano-Spheres of Cobalt and Cobalt Oxide : Drastic Cooling-Field Effects on Remnant Magnetization of Antiferromagnet2004

    • Author(s)
      H.Yoshikawa, K.Hayashida, Y.Kozuka, A.Horiguchi, K.Awaga, S.Bandow, S.Iijima
    • Journal Title

      Appl.Phys.Lett. 85

      Pages: 5287-5289

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Crystal structure and magnetic properties of a thiazyl organic ferromagnet, BBDTA-GaCl_4 with T_c=7.0 K2004

    • Author(s)
      W.Fujita W, K.Awaga
    • Journal Title

      Chem.Phys.Lett 388

      Pages: 186-189

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Structural phase transition in two-dimensional kagome antiferromagnet m-N-methylpyridinium α-nitronyl nitroxide・BF_4・1/3(Acetone)2004

    • Author(s)
      T.Kambe, Y.Nogami, K.Oshima, W.Fujita, K.Awaga
    • Journal Title

      J.Phys.Soc.Japan 73

      Pages: 796-799

    • NAID

      110001974346

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Pressure effects on magnetic bistability in a heterocyclic thiazyl radical TTTA2004

    • Author(s)
      T.Tanaka, W.Fujita, K.Awaga
    • Journal Title

      Chem.Phys.Lett 393

      Pages: 150-152

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Packing Motifs and Magneto-Structural Correlations in Crystal structures of Metallo-Tetrakis(1,2,5-thiadiazole)porphyrazine Series, TTDPzM (M = H_2, Fe, Co, Ni, Cu, Zn)2004

    • Author(s)
      Y.Suzuki, M.Fujimori, H.Yoshikawa, K.Awaga
    • Journal Title

      Chem.Euro.J 10

      Pages: 5158-5164

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Preparation and Magnetic Properties of Hollow Nano-Spheres of Cobalt and Cobalt Oxide : Drastic Cooling-Field Effects on Remnant Magnetization of Antiferromagnet2004

    • Author(s)
      H.Yoshikawa, K.Hayashida, Y.Kozuka, A.Horiguchi, K.waga, S.Bandow, S.Iijima
    • Journal Title

      Appl.Phys.Lett 85

      Pages: 5287-5289

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Room-temperature magnetic bistability in organic radical crystals : Paramagnetic-diamagnetic phase transition in 1,3,5-trithia-2,4,6-triazapentalenyl2002

    • Author(s)
      W.Fujita, K.Awaga, H.Matsuzaki, H.Okamoto
    • Journal Title

      Phys.Rev. B65

      Pages: 64434-64434

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Magnetic anisotropy, tunneling effects, high-frequency EPR, and molecular structure of fast-relaxation species of Mn_<12>2002

    • Author(s)
      K.Takeda, K.Awaga, T.Inabe, A.Yamaguchi, H.Ishimoto, T.Tomita, H.Mitamura, T.Goto, N.Mori, H.Nojiri
    • Journal Title

      Phys.Rev. B65

      Pages: 94424-94424

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Room-temp erature magnetic bistability in organic radical crystals : Paramagn etic-diamagnetic phase transition in 1,3,5-trithia-2,4,6-triazapental enyl2002

    • Author(s)
      W.Fujita, K.Awaga, H.Matsuzaki, H.Okamoto
    • Journal Title

      Phys.Rev.B 65

      Pages: 64434-64434

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Magnetic anisotropy, tunneling effects, high-frequency EPR, and niolecular structure of fast-relaxation species of Mn_<12>2002

    • Author(s)
      K.Takeda, K.Awaga, T.Inabe, A.Yamaguchi, H.Ishimolo, T.Tomita, H.Mitamura, T.Goto, N.Mori, H.Nojiri
    • Journal Title

      Phys.Rev.B 65

      Pages: 94424-94424

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] T.Goto, T.Koshiba, T.Kubo, K.Awaga: "Transverse and longitudinal relaxations of Mn-55 in the molecular cluster magnet Mn_<12>O_<12>(CH_3COO)_<16>(H_2O)_4"Phys.Rev.B. 67. 104408 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Suzuki, K.Takeda, K.Awaga: "Enhancement of Jahn-Teller isomerism in Mn12Ac under high quasi-hydrostatic pressure"Phys.Rev.B. 67. 132402 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Matsuzaki, W.Fujita, K.Awaga, H.Okamoto: "Photoinduced phase transition in an organic radical crystal with room-temperature optical and magnetic bistability"Phys.Rev.Lett. 91. 017403 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Fujimori, Y.Suzuki, H.Yoshikawa, K.Awaga: "Packing Motifs in Porphyrazine Macrocycles Carrying Peripherally-Annulated Thiadiazole Rings : Crystal Growths of Metal-Free and Cobalt Tetrakis(1,2,5-thiadiazole)porphyrazines"Angew.Chem.Int.Ed.. 42. 5780-5786 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] W.Fujita, K.Awaga, H.Matsuzaki, H.Okamoto: "Room-temperature magnetic bistability in organic radical crystals : Paramagnetic-diamagnetic phase transition in 1,3,5-trithia-2,4,6-triazapentalenyl"Phys.Rev. B65. 064434 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] W.Fujita, K.Awaga, Y.Nakazawa, K.Saito K, M.Sorai: "Complex phase transitions in stable thiazyl radicals: spin-gap, antiferromagnetic ordering and double melting"Chem.Phys.Lett.. 352. 348-352 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Takeda, K.Awaga, T.Inabe, A.Yamaguchi, H.Ishimoto, T.Tomita, H.Mitamura, T.Goto, N.Mon, H.Nojiri: "Magnetic anisotropy, tunneling effects, high-frequency EPR, and molecular structure offast-relaxation species of Mn-12"Phys.Rev. B65. 094424 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] W.Fujita, K.Awaga: "Organic ferromagnetism of T_c=6.7 K driven by evaporation of crystal solvent"Chem.Phys.Lett.. 357. 385-388 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Kubo, T.Goto, T.Koshiba, K.Takeda, K.Awaga: "Mn-55 NMR in Mn-12 acetate: Hyperfine interaction and magnetic relaxation of the cluster"Phys.Rev. B65. 224425 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] W.Fujita, K.Awaga, M.Takahashi, M.Takeda, T.Yamazaki: "Spontaneous magnetization below 44 K in (benzo[l,2-d : 4,5-d']bis[1,3,2]dithiazole) center dot FeCl4 driven by evaporation of crystal solvent"Chem.Phys.Lett.. 362. 97-102 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] W. Fujita, K. Awaga: "Ferromagnetic Coordination Polymer Composed of Heterocyclic Thiazyl Radical, 1,3,5-Trithia-2,4,6-triazapentalenyl (TTTA), and Bis(hexafluoroacetylacetonato) copper (II) (Cu(hfac)_2)"J. Am. Chem. Soc. 123. 3601-3602 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] W. Fujita, K. Awaga: "Novel magnetic properties of heterocyclic thiazyl radicals"Polyhedron. 20. 1517-1519 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] A. Yamaguchi, K. Awaga: "Inner- and outer-sphere magnetic moments in cobalt-quinone valence tautomeric system"J. Mater. Chem.. 11. 2142-2145 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T. Otsuka, M. Yoshimaru, K. Awaga, H. Imai, T. Inabe, N. Wada, M. Ogata: "Magnetic Conversion Induced by Non-Magnetic Impurities in a Molecular Spin Ladder System, ρ-EPYNN・[Ni(dmit)_2]"J. Phys. Soc. Japan. 70. 2711-2716 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] W. Fujita, K. Awaga: "Room-Temperature Magnetic Bistability in Organic Crystals : A Comparison with Spin Crossover Transitions"J. Solid State Chem.. 159. 451-454 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T. Akutagawa, N. Takamatsu, K. Shitagami, T. Hasegawa, T. Nakamura, T. Inabe, W. Fujita, K. Awaga: "Diversity in the 1/2 spin arrangement of [Ni(dmit)_2] anions in divalent Ca^<2+>(crown ether) supramolecular cation salts"J. Mater. Chem.. 11. 2119-2125 (2001)

    • Related Report
      2001 Annual Research Report

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

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