Research on 3 dimensional magnetic recording for high-capacity and low power consuming storage technologies

• Project/Area Number: 23360160
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Electron device/Electronic equipment
• Research Institution: Keio University
• Principal Investigator: NOZAKI Yukio 慶應義塾大学, 理工学部, 准教授 (30304760)
• Co-Investigator(Kenkyū-buntansha): MATSUYAMA Kimihide 九州大学, 大学院・システム情報科学研究院, 教授 (80165919) ; 山口 明啓 産業技術総合研究所, ナノスピントロニクス・研究センター, 研究員 (70423035)
• Project Period (FY): 2011-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥20,280,000 (Direct Cost: ¥15,600,000、Indirect Cost: ¥4,680,000); Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2012: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2011: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
• Keywords: 磁気記録 / 強磁性共鳴 / 垂直磁化膜 / マイクロ波 / 垂直磁気記録 / マイクロ波アシスト記録 / 3次元記録 / 垂直磁気異方性

Research Abstract

A three-dimensional magnetic recording in a multi-layered stacked magnetic pillar was investigated using micromagnetic simulation. Selective magnetization switching is possible with the assistance of a circularly polarized microwave field with an adequate corresponding frequency. The value of the saturation magnetization of the magnetic layers is critical in suppressing selective magnetization switching errors caused by magnetostatic fields. A large saturation magnetization of up to 600 emu/cm3 in the second layer allows successful three-dimensional magnetic recording. Microwave-assisted recording on a 500-Gbpsi-class perpendicular medium was experimentally demonstrated at room temperature. A frequency-dependent reduction in the switching field was clearly observed in response to a microwave impulse 50 ns in duration. A significant reduction of up to 30% in the coercive field was achieved by applying a microwave impulse with an amplitude of 25 dBm and a frequency of 15 GHz.

Research Products

• [Journal Article] Frequency dependence of critical switching asteroid of CoCrPt-SiO2 granular film under 50-ns microwave impulse (2013)
  • Author(s): N. Ishida, Y. Soeno, K. Sekiguchi, and Y. Nozaki
  • Journal Title: J. Appl. Phys Volume: 114, 043915 Issue: 4 Pages: 1439081-6
  • DOI: 10.1063/1.4816778
  • Peer Reviewed
• [Journal Article] Selective Magnetization Switching with Microwave Assistance for Three-Dimensional Magnetic Recording (2013)
  • Author(s): T. Tanaka, Y. Otsuka, Y. Furomoto, K. Matsuyama, and Y. Nozaki
  • Journal Title: J. Appl. Phys Volume: 113 Issue: 14
  • DOI: 10.1063/1.4801888
  • Peer Reviewed
• [Journal Article] Micromagnetic Study of Microwave-Assisted Magnetization Reversals of Exchange-Coupled Composite Nanopillars (2013)
  • Author(s): T. Tanaka, N. Narita, A. Kato, Y. Nozaki, Y.-K. Hong, and K. Matsuyama
  • Journal Title: IEEE Trans. Magn Volume: 49 Issue: 1 Pages: 562-566
  • DOI: 10.1109/tmag.2012.2211030
  • Peer Reviewed
• [Journal Article] 高出力マイクロ波による強磁性共鳴を利用したCoCrPtグラニュラー膜の磁化反転 (2013)
  • Author(s): 能崎 幸雄, 石田 尚子, 添野 佳一, 小林 尚史, 関口 康爾
  • Journal Title: 磁気学会研究会資料 Volume: 188 Pages: 11-14
  • NAID: 10031143723
• [Journal Article] マイクロ波磁場による垂直媒体の保磁力低減効果 (2013)
  • Author(s): 能崎 幸雄, 石田 尚子, 添野 佳一, 関口 康爾
  • Journal Title: IEICE Technical Report Volume: MR2013-6 Pages: 1-6
• [Journal Article] Room temperature microwaveassisted recording on 500-Gbpsi-class perpendicular medium (2012)
  • Author(s): Y. Nozaki, N. Ishida, Y. Soeno, and K. Sekiguchi
  • Journal Title: J. Appl. Phys Volume: 112 Issue: 8 Pages: 83912-83912
  • DOI: 10.1063/1.4759169
  • Peer Reviewed
• [Journal Article] 高強度マイクロ波インパルスによる垂直媒体保磁力の非線形減少 (2012)
  • Author(s): 能崎幸雄ら
  • Journal Title: 電気学会研究会資料 Volume: Mag-12-169~180 Pages: 1-6
  • NAID: 10031142021
• [Journal Article] 強磁性薄膜パターンに閉じ込められた磁気渦対の共振スペクトルを用いたスピンダンピング機構の解析 (2012)
  • Author(s): 能崎幸雄ら
  • Journal Title: 日本磁気学会研究会資料 Volume: 183 Pages: 31-36
  • NAID: 10030543184
• [Journal Article] Microwave-assisted magnetic recording simulation on exchange-coupled composite medium (2012)
  • Author(s): T.Tanaka, A.Kato, Y.Furomoto, A.F.Md Nor, Y.Kanai, Kimihide Matsuyama
  • Journal Title: Journal of Applied Physics Volume: 111 Issue: 7
  • DOI: 10.1063/1.3678450
  • Peer Reviewed
• [Journal Article] マイクロ波アシスト磁化反転の周波数選択性を利用した多値記録に関する基礎検討 (2012)
  • Author(s): 大塚勇人ら
  • Journal Title: IEICE Technical Report Volume: 112 Pages: 11-16
• [Journal Article] マイクロ波アシスト磁気記録過程のマイクロマグネティック計算 (2012)
  • Author(s): 田中輝光ら
  • Journal Title: IEICE Technical Report Volume: 112 Pages: 17-22
• [Journal Article] Ferromagnetic resonance properties of granular Co-Cr-Pt films measured by micro-fabricated coplanar waveguides (2011)
  • Author(s): T. Kobayashi, N. Ishida, K. Sekiguchi, and Y. Nozaki
  • Journal Title: J. Appl. Phys Volume: 111 Issue: 7
  • DOI: 10.1063/1.3679411
  • Peer Reviewed
• [Journal Article] Micromagnetic study on microwave-assisted magnetic recording in perpendicular medium with intergrain exchange coupling (2011)
  • Author(s): Yukio Nozaki, Ayumu Kato, Kenji Noda, Yasushi Kanai, Terumitsu Tanaka, Kimihide Matsuyama
  • Journal Title: Journal of Applied Physics Volume: 109 Issue: 12
  • DOI: 10.1063/1.3596805
  • Peer Reviewed
• [Journal Article] Electric spectroscopy of vortex states and dynamics in magnetic disks (2011)
  • Author(s): M.Goto, et al
  • Journal Title: Physical Review B Volume: 84 Issue: 6
  • DOI: 10.1103/physrevb.84.064406
  • Peer Reviewed
• [Journal Article] Electrical detection of vortex states in a ferromagnetic disk using the rectifying effect (2011)
  • Author(s): M.Goto, et al
  • Journal Title: Journal of Applied Physics Volume: 109 Issue: 7
  • DOI: 10.1063/1.3536390
  • Peer Reviewed
• [Journal Article] 微細加工したコプレーナ線路を用いたマイクロ波アシスト磁化反転実験 (2011)
  • Author(s): 能崎幸雄, ら
  • Journal Title: 映像情報メディア学会技術報告 Volume: 35 Pages: 39-46
  • NAID: 110008688903
• [Journal Article] Detection of ferromagnetic resonance in a single-crystalline Fe wire using a rectifying effect (2011)
  • Author(s): Y.Kasatani, et al
  • Journal Title: Journal of Physics : Conference Series Volume: 266 Pages: 012013-012013
  • DOI: 10.1088/1742-6596/266/1/012013
  • Peer Reviewed
• [Journal Article] Detection of vortex-core dynamics using current-induced self-bistable rectifying effect (2011)
  • Author(s): M.Goto, et al
  • Journal Title: Journal of Physics : Conference Series Volume: 266 Pages: 012080-012080
  • DOI: 10.1088/1742-6596/266/1/012080
  • Peer Reviewed
• [Journal Article] Fourfold in-plane magnetic anisotropy in sputtered (100) MgO/Fe epitaxial films (2011)
  • Author(s): K.Noda, et al
  • Journal Title: Journal of Physics : Conference Series Volume: 266 Pages: 012014-012014
  • DOI: 10.1088/1742-6596/266/1/012014
  • Peer Reviewed
• [Presentation] Pulse duration dependence of microwave-assisted magnetization reversal in CoCrPt-based granular medium (2013)
  • Author(s): Y. Nozaki, N. Ishida, Y. Soeno, and K. Sekiguchi
  • Organizer: 12th Joint MMM-Intermag conference
  • Place of Presentation: Cicago (USA)
  • Year and Date: 2013-01-16
• [Presentation] Composition dependence of the intrinsic Gilbert damping of Co3-xFexSi Heusler alloy films. (2013)
  • Author(s): Y. Kasatani, S. Yamada, H. Itoh, M. Miyao, K. Hamaya and Y. Nozaki
  • Organizer: The 8th International Symposium on Metallic Multilayers (MML2013)
  • Place of Presentation: Kyoto (Japan)
• [Presentation] マイクロ波磁場による垂直媒体の保磁力低減効果 (2013)
  • Author(s): 能崎幸雄, 石田 尚子, 添野 佳一, 関口 康爾
  • Organizer: 電子情報通信学会 磁気記録・情報ストレージ研究会(MRIS)
  • Place of Presentation: 中央大学
  • Invited
• [Presentation] 次世代磁気記録へのマイクロ波技術の応用 (2013)
  • Author(s): 能崎幸雄
  • Organizer: 電気学会マグネティクス研究会
  • Place of Presentation: 金沢大学
• [Presentation] Fe単結晶薄膜におけるダンピング定数の結晶方位依存性 (2013)
  • Author(s): 笠谷雄一, 能崎幸雄
  • Organizer: 第37回 日本磁気学会学術講演会
  • Place of Presentation: 北海道大学
• [Presentation] CoCrPtグラニュラー媒体の臨界スイッチング曲線の周波数依存性 (2013)
  • Author(s): 能崎幸雄, 石田尚子, 添野佳一, 関口康爾
  • Organizer: 九州・山口・沖縄磁気セミナー
  • Place of Presentation: 屋久島環境文化村センター
• [Presentation] Pulse duration dependence of microwave-assisted magnetization reversal in CoCrPt-based granular medium. (2013)
  • Author(s): Y. Nozaki et al.
  • Organizer: 12th Joint MMM-Intermag conference
  • Place of Presentation: Cicago (USA)
• [Presentation] 高出力マイクロ波による強磁性共鳴を利用したCoCrPtグラニュラー膜の磁化反転 (2013)
  • Author(s): 能崎幸雄ら
  • Organizer: 日本磁気学会第188回研究会
  • Place of Presentation: 中央大学
  • Invited
• [Presentation] Microwave-power dependence of switching field required for MAMR in CoCrPt-SiO2 perpendicular medium (2012)
  • Author(s): N. Ishida, Y. Soeno, K. Sekiguchi, and Y. Nozaki
  • Organizer: ICAUMS 2012
  • Place of Presentation: Nara (Japan)
  • Year and Date: 2012-10-03
• [Presentation] Selective magnetization switching by microwave assistance for layered magnetic pillar (2012)
  • Author(s): T. Tanaka, Y. Otsuka, Y. Furumoto, K. Matsuyama, and Y. Nozaki
  • Organizer: ICM 2012
  • Place of Presentation: Busan (Korea)
  • Year and Date: 2012-07-12
• [Presentation] Selective magnetization switching with microwave assistance for 3 dimensional magnetic recording (2012)
  • Author(s): T. Tanaka ,Y. Otsuka, Y. Furumoto, K. Matsuyama, and Y. Nozaki
  • Organizer: Intermag 2012
  • Place of Presentation: Vancouver (Canada)
  • Year and Date: 2012-05-09
• [Presentation] Experimental study on microwave-assisted writing of 500 Gbpsi-class perpendicular medium (2012)
  • Author(s): N. Ishida, Y. Soeno, K. Sekiguchi, and Y. Nozaki
  • Organizer: Intermag 2012
  • Place of Presentation: Vancouver (Canada)
  • Year and Date: 2012-05-09
• [Presentation] 垂直磁化グラニュラー膜のマイクロ波アシスト磁化反転実験 (2012)
  • Author(s): 石田尚子, ら
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-26
• [Presentation] 強磁性薄膜パターンに閉じ込められた磁気渦対の共振スペクトルを用いたスピンダンピング機構の解析 (2012)
  • Author(s): 能崎幸雄, ら
  • Organizer: 日本磁気学会第183回研究会
  • Place of Presentation: 明治大学(招待講演)
  • Year and Date: 2012-03-22
• [Presentation] Ferromagnetic resonance properties of granular Co-Cr-Pt films measured using micro-fabricated coplanar waveguides (2011)
  • Author(s): T. Kobayashi , N. Ishida and Y. Nozaki
  • Organizer: The 56th Magnetism and Magnetic Materials Conference
  • Place of Presentation: Scottsdale (USA)
  • Year and Date: 2011-11-01
• [Presentation] 強磁性複合膜細線中におけるスピン波の共鳴周波数変調 (2011)
  • Author(s): 笠谷雄一, ら
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 新潟国際会議場
  • Year and Date: 2011-09-29
• [Presentation] コプレーナ線路を用いた強磁性薄膜パターンの高感度FMR検出に関する研究 (2011)
  • Author(s): 小林尚史, ら
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 新潟国際会議場
  • Year and Date: 2011-09-28
• [Presentation] グラニュラーCoCrPt薄膜の強磁性共鳴スペクトル測定 (2011)
  • Author(s): 石田尚子, ら
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 新潟国際会議場
  • Year and Date: 2011-09-28
• [Presentation] マイクロ波整流効果を用いたナノスケール磁性体の磁気ダイナミクス検出 (2011)
  • Author(s): 山口明啓, ら
  • Organizer: 電気学会マグネティクス研究会
  • Place of Presentation: KKR鳥羽(三重県)(招待講演)
  • Year and Date: 2011-09-19
• [Presentation] Measurement of complex susceptibility using vector network analyzer FMR spectroscopy (2011)
  • Author(s): T.Kobayashi, et al
  • Organizer: SPINTECH 6
  • Place of Presentation: Matsue (Japan)
  • Year and Date: 2011-08-04
• [Presentation] Ferromagnetic resonance measurement of Co/Ni perpendicular magnetized multilayers (2011)
  • Author(s): S.Kanda, et al
  • Organizer: SPINTECH 6
  • Place of Presentation: Matsue (Japan)
  • Year and Date: 2011-08-04
• [Presentation] Study on magnetization dynamics induced by current and field in a magnetic wire using rectifying effect (2011)
  • Author(s): A.Yamaguchi, et al
  • Organizer: SPINTECH 6
  • Place of Presentation: Matsue (Japan)
  • Year and Date: 2011-08-04
• [Presentation] Measurement of complex susceptibility using vector network analyzer FMR spectroscopy (2011)
  • Author(s): T. Kobayashi,H. Ueda, A. Yamaguchi and Y. Nozaki
  • Organizer: SPINTECH 6, FP-64
  • Place of Presentation: Matsue (Japan)
  • Year and Date: 2011-08-03
• [Presentation] 微細磁気構造の制御とデバイス応用 (2011)
  • Author(s): 松山公秀, ら
  • Organizer: 日本磁気学会第178回研究会
  • Place of Presentation: 明治大学(招待講演)
  • Year and Date: 2011-05-20
• [Remarks]
  • URL: http://www.phys.keio.ac.jp/guidance/labs/nozaki/index.html
• [Remarks]
  • URL: http://www.phys.keio.ac.jp/guidance/labs/nozaki/index.html