A study on magnetization reversal of nano-magnet using magnetic tunnel junctions

• Project/Area Number: 16K18084
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Electron device/Electronic equipment
• Research Institution: Tohoku University
• Principal Investigator: Sato Hideo 東北大学, スピントロニクス学術連携研究教育センター, 准教授 (80599514)
• Research Collaborator: IGARASHI Junta
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 磁化反転 / 磁気トンネル接合 / スピン移行トルク / 垂直容易軸 / 磁化反転磁界 / ナノ磁性体

Outline of Final Research Achievements

Magnetization reversal of nanomagnet has been studied by using magnetic tunnel junction with junction diameter of about 20 nm. In particular, the relationship between the magnetization reversal and device-processing conditions was studied. It was revealed that magnetization reversal of the nanomagnet changes depending on the device-processing conditions. It was also revealed that the change in the magnetization reversal can be explained by introducing reduction of magnetic anisotropy at the vicinity of the device edge by using micromagnetic simulation.

Research Products

• [Journal Article] Magnetic-field-angle dependence of coercivity in CoFeB/MgO magnetic tunnel junctions with perpendicular easy axis (2017)
  • Author(s): Igarashi J.、Llandro J.、Sato H.、Matsukura F.、Ohno H.
  • Journal Title: Applied Physics Letters Volume: 111 Issue: 13 Pages: 132407-132407
  • DOI: 10.1063/1.5004968
  • Peer Reviewed
• [Presentation] Dependence of switching current on out-of-plane field in CoFeB/MgO magnetic tunnel junctions with perpendicular easy axis at low temperature (2018)
  • Author(s): Junta Igarashi
  • Organizer: 第78回応用物理学会秋季学術講演会
• [Presentation] Magnetic-field-angle dependence of coercivity in a nanoscale CoFeB-MgO magnetic tunnel junction with perpendicular easy axis at various temperatures (2017)
  • Author(s): J. Igarashi
  • Organizer: 第64回応用物理学会春季学術講演会
  • Place of Presentation: パシフィコ横浜 (神奈川県横浜市)
  • Year and Date: 2017-03-14
• [Presentation] Out-of-plane field dependence of switching current in CoFeB/MgO magnetic tunnel junctions with perpendicular easy axis at low temperature (2017)
  • Author(s): Junta Igarashi
  • Organizer: 62nd Magnetism and Magnetic Materials
  • Int'l Joint Research
• [Presentation] Magnetic field angle dependence of switching field in CoFeB-MgO Magnetic tunnel junction with perpendicular easy axis at low temperature (2016)
  • Author(s): J. Igarashi
  • Organizer: 2016 Solid State Devices and Materials
  • Place of Presentation: つくば国際会議場 (茨城県つくば市)
  • Year and Date: 2016-09-26
  • Int'l Joint Research
• [Presentation] Magnetic field angle dependence of switching field in CoFeB-MgO Magnetic tunnel junction with perpendicular easy axis (2016)
  • Author(s): J. Igarashi
  • Organizer: 電子材料シンポジウム
  • Place of Presentation: ラフォーレ琵琶湖 (滋賀県守山市)
  • Year and Date: 2016-07-06