Electrical control of magnetization

2011 Fiscal Year Final Research Report

• Project/Area Number: 21681021
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Microdevices/Nanodevices
• Research Institution: Kyoto University
• Principal Investigator: CHIBA Daichi 京都大学, 化学研究所, 准教授 (10505241)
• Project Period (FY): 2009 – 2011
• Keywords: スピンデバイス / 磁化制御 / 磁気メモリ / 磁気異方性 / 電界効果

Research Abstract

To control magnetism and magnetization direction by electrical means is main purpose of this research. By using ferromagnetic semiconductors, an electric-field induced ferromagnetic phase transition and magnetization switching have been achieved. Furthermore, we observed ferromagnetic phase transition by applying an electric field even in a ferromagnetic metal for the first time at room temperature.

Research Products

• [Journal Article] Electrical control of Curie temperature in cobalt using an ionic liquid film (2012)
  • Author(s): K. Shimamura, D. Chiba, S. Ono, S. Fukami, N. Ishiwata, M. Kawaguchi, K. Kobayashi, and T. Ono
  • Journal Title: Applied Physics Letters Volume: 100 Pages: 122402(1)-(3)
  • DOI: DOI:10.1063/1.3695160.
  • Peer Reviewed
• [Journal Article] Electrical control of the ferromagnetic phase transition in cobalt at room temperature (2011)
  • Author(s): D. Chiba, S. Fukami, K. Shimamura, N. Ishiwata, K. Kobayashi, T. Ono
  • Journal Title: Nature Materials Volume: 10 Pages: 853-586
  • DOI: DOI:10.1038/NMAT3130.
  • Peer Reviewed
• [Journal Article] Electrically defined ferromagnetic nanodots (2010)
  • Author(s): D. Chiba, F. Matsukura, and H. Ohno
  • Journal Title: Nano Letters Volume: 10 Pages: 4505-4508
  • DOI: DOI:10.1021/nl102379h.
  • Peer Reviewed
• [Journal Article] Simulation of magnetization switching by electric-field manipulation of magnetic anisotropy (2010)
  • Author(s): D. Chiba, Y. Nakatani, F. Matsukura, and H. Ohno
  • Journal Title: Applied Physics Letters Volume: 96 Pages: 192506(1)-(3)
  • DOI: DOI:10.1063/1.3428959
  • Peer Reviewed
• [Journal Article] Anomalous Hall Effect in Field-Effect Structures of(Ga, Mn) As (2010)
  • Author(s): D. Chiba, A. Werpachowska, M. Endo, Y. Nishitani, F. Matsukura, T. Dietl, and H. Ohno
  • Journal Title: Physical Review Letters Volume: 104 Pages: 106601(1)-(4)
  • DOI: DOI:10.1103/PhysRevLett.104.106601.
  • Peer Reviewed
• [Journal Article] Curie temperature versus hole concentration in field-effect structures of Ga1-xMnxAs (2010)
  • Author(s): Y. Nishitani, D. Chiba, M. Endo, M. Sawicki, F. Matsukura, T. Dietl, and H. Ohno
  • Journal Title: Physical Review B Volume: 81 Pages: 045208(1)-(8)
  • DOI: DOI:10.1103/PhysRevB.81.045208.
  • Peer Reviewed
• [Journal Article] (2010)
  • Author(s): M. Endo, D. Chiba, H. Shimotani, F. Matsukura, Y. Iwasa, and H. Ohno
  • Journal Title: Applied Physics Letters Volume: 96 Pages: 022515(1)-(3)
  • DOI: DOI:10.1063/1.3277146.
  • Peer Reviewed
• [Presentation] Electric field control of ferromagnetism in III-V ferromagnetic semiconductor structures (2011)
  • Author(s): D. Chiba, K. Kobayashi, T. Ono, F. Matsukura, H. Ohno
  • Organizer: Moscow International Symposium on Magnetism
  • Place of Presentation: モスクワ・ロシア
  • Year and Date: 2011-08-23
• [Presentation] Modulation of coercivity by electric fields in Co/Pt ultra-thin films (2011)
  • Author(s): D. Chiba, S. Fukami, K. Shimamura, N. Ishiwata, K. Kobayashi, T. Ono
  • Organizer: 5th International Workshop on Spin Currents
  • Place of Presentation: 仙台国際センター
  • Year and Date: 2011-07-25
• [Presentation] Magnetization switching and nano-dot formation by electric field in(Ga, Mn) As structure (2010)
  • Author(s): D. Chiba, K. Kobayashi, T. Ono, F. Matsukura, and H. Ohno
  • Organizer: Super-PIRE/Reimei/MWN Joint Kickoff Meeting
  • Place of Presentation: ノックスビル・米国
  • Year and Date: 2010-10-30
• [Presentation] Electric-field manipulation of magnetic anisotropy in(Ga, Mn) As (2009)
  • Author(s): D. Chiba, M. Sawicki, Y. Nishitani, Y. Nakatani, T. Ono, F. Matsukura, and H. Ohno
  • Organizer: Advances in Magnetic Nanostructures
  • Place of Presentation: ヴェイル・米国
  • Year and Date: 2009-10-08
• [Presentation] Electric-field manipulation of magnetization vector in(Ga, Mn) As (2009)
  • Author(s): D. Chiba, M. Sawicki, Y. Nishitani, Y. Nakatani, T. Ono, F. Matsukura, and H. Ohno
  • Organizer: The 18th International Conference on Electronic Properties of Two-Dimensional Systems
  • Place of Presentation: 神戸国際会議場
  • Year and Date: 2009-07-21
• [Presentation] Electric field manipulation of magnetic anisotropy in ferromagnetic semiconductors (2009)
  • Author(s): D. Chiba, M. Sawicki, Y. Nishitani, Y. Nakatani, T. Ono, F. Matsukura, and H. Ohno
  • Organizer: International Magnetics Conference
  • Place of Presentation: サクラメント・米国
  • Year and Date: 2009-05-05
• [Remarks] 報道関連情報(1) 2011年10月3日,京都新聞朝刊22面,"永久磁石の磁力完全オフ"
• [Remarks] (2) 2011年10月3日,朝日新聞朝刊34面,"薄い磁石に電圧磁力消えた"
• [Remarks] (3) 2011年10月3日,日本経済新聞朝刊11面,"室温で磁力ゼロに"
• [Remarks] (4) 2011年10月3日,毎日新聞朝刊21面,"室温で磁性をオン・オフ"
• [Remarks] (5) 2011年10月3日,中日新聞朝刊32面,"コバルトに電圧金属の磁性消す"
• [Patent(Industrial Property Rights)] 電圧駆動型電磁石 (2011)
  • Inventor(s): 千葉大地、小野輝男
  • Industrial Property Rights Holder: 千葉大地、小野輝男
  • Filing Date: 2011-09-09
  • Overseas