Research on low spin-damping magnetic materials for the power-efficient spin-controlled devices

• Project/Area Number: 23560384
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Electron device/Electronic equipment
• Research Institution: Yamagata University
• Principal Investigator: TAKAHASHI Yutaka 山形大学, 理工学研究科, 准教授 (00260456)
• Co-Investigator(Renkei-kenkyūsha): INABA Nobuyuki 山形大学, 大学院理工学研究科, 教授 (50396587)
• Project Period (FY): 2011 – 2013
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2011: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: スピントロニクス / 磁気記録 / 強磁性共鳴 / 磁気緩和係数 / 3d強磁性遷移金属 / rfマグネトロンスパッタリング / 強磁性共鳴測定 / 3d遷移金属 / RFマグネトロンスパッタリング

Research Abstract

Spin damping is an important phenomenon which affects the speed of hard disk drives and the power consumption of spin-memory devices under development. Understanding its physical origin is mandatory for the material design of these devices. We have investigated the spin (Gilbert) damping coefficients of Fe thin films with dilute concentrations of Co or Ni, which are 3d transition metals and are widely-used magnetic materials. The films were fabricated in high-vacuum and later some of them were annealed to improve the crystallinity. The Gilbert damping coefficients were measured by the ferromagnetic resonance spectroscopy. It is found that the damping coefficients reduce slightly after annealing. It is theoretically anticipated that the spin damping depends on the scattering rate of electrons in metals. Our findings infer that damping of the films reduces because the scattering rate lowers as the crystallinity improves.

Research Products

• [Journal Article] Ferromagnetic Resonance Study of Fe_<100->xCo_x/GaAs(001) (x < 11) Deposited by RF Magnetron Sputtering (2013)
  • Author(s): Y. Wada, Y. Takahashi, N. Inaba, F. Kirino, M. Ohtake, M. Futamoto
  • Journal Title: Journal of the Magnetic Society of Japan Volume: 37 (3-2)(Proceedings of ICAUMS 2012) Pages: 166-170
  • Peer Reviewed
• [Journal Article] Ferromagnetic Resonance Study of Fe_100-<i>x</i>Co_<i>x</i>/GaAs(001) (<i>x</i> &lt; 11) Deposited by RF Magnetron Sputtering (2013)
  • Author(s): Y. Wada
  • Journal Title: Journal of the Magnetics Society of Japan Volume: 37 Issue: 3-2 Pages: 166-170
  • DOI: 10.3379/msjmag.1212R003
  • NAID: 130004502832
  • ISSN: 1882-2924, 1882-2932
  • Peer Reviewed
• [Journal Article] Q-Band Ferromagnetic Resonance Study of Fe Thin Films on GaAs(001) Deposited by RF Magnetron Sputtering (2011)
  • Author(s): Y. Takahashi, H. Ikeya, N. Inaba, F. Kirino, M. Ohtake, M. Futamoto
  • Journal Title: IEEE Transactions on Magnetics Volume: 47 (12) Pages: 4682-4685
  • Peer Reviewed
• [Journal Article] Q-band Ferromagnetic Resonance Study of Fe Thin Films on GaAs (001) Deposited by RF Magnetron Sputtering (2011)
  • Author(s): Y. Takahashi, H. Ikeya, N, Inaba, F. Kirino, M. Ohtake, M. Futamoto
  • Journal Title: IEEE Transactions on Magnetics Volume: Vol.47 Issue: 12 Pages: 4682-4585
  • DOI: 10.1109/tmag.2011.2158847
  • Peer Reviewed
• [Presentation] Angular dependence of ferromagnetic resonance line width for Fe_<100-x>Co_x(001) single crystal thin films with bcc and fcc crystal structure (2014)
  • Author(s): M. Tsuruike, H. Fujita, Y. Takahashi, N. Inaba, M. Ohtake, M. Futamoto, F. Kirino
  • Organizer: Intermag Europe 2014
  • Place of Presentation: Dresden, Germany(ES-15)
  • Year and Date: 2014-05-07
• [Presentation] Angular dependence of ferromagnetic resonance line width for Fe(100-x)Co(x)(001) single crystal thin films with bcc and fcc crystal structure (2014)
  • Author(s): M. Tsuruike, H. Fujita, Y. Takahashi, N. Inaba, M. Ohtake, M. Futamoto, F. Kirino
  • Organizer: Intermag Europe 2014
  • Place of Presentation: International Congress Center Dresden (Germany)
• [Presentation] スパッタ法により作製したGaAs上FeCo単結晶薄膜のアニーリング効果 (2013)
  • Author(s): 草岡昭成, 高橋豊, 稲葉信幸, 桐野文良, 大竹充, 二本正昭
  • Organizer: 応用物理学会東北支部第68回学術講演会
  • Place of Presentation: 山形大学工学部(米沢市)
  • Year and Date: 2013-12-06
• [Presentation] RFスパッタ法により作製したGaAs基板上FeNi合金薄膜の結晶および磁気特性 (2013)
  • Author(s): 木村純, 高橋豊, 稲葉信幸, 桐野文良, 大竹充, 二本正昭
  • Organizer: 応用物理学会東北支部第68回学術講演会
  • Place of Presentation: 山形大学工学部(米沢市)
  • Year and Date: 2013-12-06
• [Presentation] スパッタ法により作製したGaAs上FeCo単結晶薄膜のアニーリング効果 (2013)
  • Author(s): 草岡昭成，高橋豊，稲葉信幸，桐野文良，大竹充，二本正昭
  • Organizer: 応用物理学会東北支部第68回学術講演会
  • Place of Presentation: 山形大学工学部（米沢）
• [Presentation] RFスパッタ法により作製したGaAs基板上FeNi合金薄膜の結晶および磁気特性 (2013)
  • Author(s): 木村純，高橋豊，稲葉信幸，桐野文良，大竹充，二本正昭
  • Organizer: 応用物理学会東北支部第68回学術講演会
  • Place of Presentation: 山形大学工学部（米沢）
• [Presentation] 強磁性共鳴法による各種強磁性単結晶薄膜の磁気緩和定数評価 (2012)
  • Author(s): 稲葉信幸, 高橋豊, 桐野文良, 大竹充, 二本正昭
  • Organizer: 日本磁気学会第186回研究会
  • Place of Presentation: 中央大学駿河台記念館(東京)
  • Year and Date: 2012-11-02
• [Presentation] RFスパッター法によるGaAs(001)上への微量Co添加Fe薄膜成長 (2011)
  • Author(s): 和田祐也, 高橋豊, 稲葉信幸, 桐野文良, 大竹充, 二本正昭
  • Organizer: 応用物理学会東北支部第66回学術講演会
  • Place of Presentation: いわて県民情報交流センター(盛岡)
  • Year and Date: 2011-12-01
• [Presentation] RFスパッター法によるGaAs(001)上への微量Co添加Fe薄膜成長 (2011)
  • Author(s): 和田裕也
  • Organizer: 応用物理学会東北支部第66回学術講演会
  • Place of Presentation: いわて県民情報交流センター
• [Remarks]
  • URL: http://takahashilab.yz.yamagata-u.ac.jp/
• [Remarks] 高橋研究室
  • URL: http://takahashilab.yz.yamagata-u.ac.jp/
• [Remarks] 高橋研究室
  • URL: http://takahashilab.yz.yamagata-u.ac.jp/
• [Remarks]
  • URL: http://takahashilab.yz.yamagata-u.ac.jp/