Magnetic damping control of ferromagnetic thin films with negative spin polarization and development of highly efficient spin-current generator

• Project/Area Number: 24710154
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Microdevices/Nanodevices
• Research Institution: Fukushima National College of Technology
• Principal Investigator: ISOGAMI Shinji 福島工業高等専門学校, その他部局等, 准教授 (10586853)
• Research Collaborator: TSUNODA Masakiyo 東北大学, 大学院工学研究科, 准教授 (80250702) ; OOGANE Mikihiko 東北大学, 大学院工学研究科, 准教授 (50396454) ; SAKUMA Akimasa 東北大学, 大学院工学研究科, 教授 (30361124)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 窒化鉄 / スピン流 / スピンポンピング / 磁気緩和 / 窒化鉄薄膜 / 結晶構造 / Kerr効果 / スパッタ成膜 / 赤外線加熱プロセス

Outline of Final Research Achievements

Highly efficient spin-current generator was developed using Fe4N thin films with negative spin polarization. The high quality Fe4N/Pt bilayer films were fabricated by the reactive sputtering with Ar and N2 gas mixture during thermal treatment using the focused IR heating system. The electromotive force due to inverse spin-Hall effect generated by spin-pumping from the Fe4N films exhibited one order larger value, compared with the NiFe conventional films. The results implied that our developed Fe4N/Pt systems provided highly spin-current generator.

Research Products

• [Journal Article] Temperature and crystal orientation dependence of magnetic damping in epitaxial Fe4N thin film (2014)
  • Author(s): S. Isogami, M. Tsunoda, M. Oogane, A. Sakuma and M. Takahashi
  • Journal Title: Journal of Magnetics Society of Japan Volume: 38 Pages: 162-168
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Enhancement of Spin Pumping Efficiency in Fe_4N/Pt Bilayer Films (2013)
  • Author(s): S. Isogami, M. Tsunoda, M. Oogane, A. Sakuma, and M. Takahashi
  • Journal Title: Applied Physics Express Volume: 6 Issue: 6 Pages: 063004-063007
  • DOI: 10.7567/apex.6.063004
  • Peer Reviewed
• [Journal Article] The Enhancement of Magnetic Damping in Fe_4N Films with Increasing Thickness (2013)
  • Author(s): S. Isogami, M. Tsunoda, M. Oogane, A. Sakuma, and M. Takahashi
  • Journal Title: Japanese Journal of Applied Physics Volume: 52 Issue: 7R Pages: 073001-073003
  • DOI: 10.7567/jjap.52.073001
  • Peer Reviewed
• [Presentation] 多結晶Co薄膜におけるスピンポンピングへ及ぼす基板加熱中成膜法の効果 (2015)
  • Author(s): 磯上慎二，日向慎太郎
  • Organizer: 第62回応用物理学会春季学術講演会
  • Place of Presentation: 東海大学
  • Year and Date: 2015-03-11 – 2015-03-14
• [Presentation] Tunable spin pumping efficiency depending on crystallographic structures in hcp-Co/Pt films (2014)
  • Author(s): S. Isogami and S. Hinata
  • Organizer: 59th Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Hawaii (USA)
  • Year and Date: 2014-11-03 – 2014-11-07
• [Presentation] Generaton of spin current from ferromagnetic materials with negative spin polarization (2014)
  • Author(s): S. Isogami, M. Tsunoda, M. Oogane, A. Sakuma and M. Takahashi
  • Organizer: 0th International Magnetics Conference, Dresden
  • Place of Presentation: Dresden (Germany)
  • Year and Date: 2014-05-04 – 2014-05-08
• [Presentation] Generation of spin current by spin pumping technique from ferromagnetic materials with negative spin polarization (2014)
  • Author(s): S. Isogami, M. Tsunoda, M. Oogane, A. Sakuma, K. Kabara, and M. Takahashi
  • Organizer: IEEE International Magnetics Conference
  • Place of Presentation: Dresden, Germany
• [Presentation] 擬単結晶Fe4N膜における磁気緩和の温度および結晶方位依存性 (2013)
  • Author(s): 磯上慎二，角田匡清，大兼幹彦，佐久間昭正，古門聡士，高橋研
  • Organizer: 第37回日本磁気学会学術講演会
  • Place of Presentation: 北海道大学
• [Presentation] Logic gate using hybrid magntic tunnel junctions with normal and inverse tunneling magnetoresistive effect (2013)
  • Author(s): S. Isogami, T. Owada
  • Organizer: 58th Annual Magnetism & Magnetic Materials Conference
  • Place of Presentation: Denver, USA
• [Presentation] 負のスピン分極を示すFe4N薄膜からのスピン流生成とその物性に関する一考察 (2013)
  • Author(s): 磯上慎二
  • Organizer: 東北大学 電気通信研究所 平成25年度スピニクス研究会
  • Place of Presentation: 東北大学
  • Invited
• [Presentation] 磁化ダイナミクスによるFe4N薄膜からのスピン流生成 (2013)
  • Author(s): 磯上慎二，角田匡清，大兼幹彦，佐久間昭正，高橋研
  • Organizer: 東北大学電気通信研究所 共同プロジェクト研究会
  • Place of Presentation: 仙台
• [Presentation] Generation of spin current from Fe4N film (2012)
  • Author(s): S. Isogami, M. Tsunoda, M. Oogane, A. Sakuma and M. Takahashi
  • Organizer: International Conference of Asian Union Magnetics Societies
  • Place of Presentation: Nara, Japan
• [Patent(Industrial Property Rights)] 論理演算素子 (2013)
  • Inventor(s): 磯上慎二
  • Industrial Property Rights Holder: 磯上慎二
  • Industrial Property Rights Type: 特許
  • Filing Date: 2013-07-04