Confinement and enhancement of spin currents by using nano constricted structure

• Project/Area Number: 16K13617
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nanostructural physics
• Research Institution: Kyushu University
• Principal Investigator: Yuasa Hiromi 九州大学, システム情報科学研究院, 教授 (20756233)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2016: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: スピン流 / 熱流 / 狭窄構造 / 狭窄 / スピンゼーベック効果 / 磁化 / 酸化 / スピンエレクトロニクス / ナノコンタクト

Outline of Final Research Achievements

In this study, we examine the possibility of the spin current confinement and enhancement by using the nano constricted structure where magnetization rapidly changes in order to utilize the spin current for applications. The spin current created by the heat current was increased as decreasing the areal density of the nano constricted region. It suggests that the rapid magnetization change has the possibility to confine and enhance the spin current.

Research Products

• [Int'l Joint Research] University of York(英国)
• [Journal Article] Spin Seebeck coefficient enhancement by using Ta50W50 alloy and YIG/Ru interface (2018)
  • Author(s): Hiromi Yuasa, Fumiya Nakata, Ryohei Nakamura and Yuichiro Kurokawa
  • Journal Title: J. Phys. D: Appl. Phys. Volume: 50
  • Peer Reviewed / Open Access
• [Journal Article] Spin mixing conductance enhancement by increasing magnetic density (2017)
  • Author(s): Hiromi Yuasa, Kouki Tamae, and Norimasa Onizuka
  • Journal Title: AIP ADVANCES Volume: 7 Issue: 13 Pages: 134002-134002
  • DOI: 10.1088/1361-6463/aaaf89
  • Peer Reviewed
• [Presentation] Inserted layer effect on Spin Mixing Conductance in Spin Seebeck Effect (2018)
  • Author(s): H. Yuasa
  • Organizer: Reimei/GP-Spin/ICC-IMR International Workshop "New Excitations in Spintronics"
  • Int'l Joint Research / Invited
• [Presentation] Spintronic phenomena and devices ～past, current and future～ (2018)
  • Author(s): H. Yuasa
  • Organizer: Joint workshop btw SKKU and Kyushu University "Emerging materials and devices"
  • Int'l Joint Research / Invited
• [Presentation] スピンゼーベック効果における界面・材料の役割 (2018)
  • Author(s): 湯浅裕美
  • Organizer: 平成30年電気学会全国大会 シンポジウム 新規スピンデバイスに向けた光・熱・磁気間相互作用の基礎と応用
  • Invited
• [Presentation] pin Seebeck voltage enhancement by inserting Mn or IrMn at interface of YIG/Ta50W50 (2018)
  • Author(s): Fumiya Nakata, Ryohei Nakamura, Sho Inami, Yuichiro Kurokawa, Hiromi Yuasa
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] Oxidation state of non-magnetic material(Ta,W,TaW) contacted YIG (2018)
  • Author(s): Ryohei Nakamura, Fumiya Nakata, Takumi Niimura, Kurokawa Yuichiro, Hiromi Yuasa
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] YIG/非磁性金属層におけるスピンホール磁気抵抗効果の観察 (2018)
  • Author(s): 新村 拓未, 中村 瞭平, 中田 記矢, 黒川 雄一郎, 湯浅 裕美
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] Thermal induced voltage in magnetic layer with nano-constricted spin valves (2018)
  • Author(s): Sho Inami, Hiromi Yuasa, Yuichiro Kurokawa, Ryohei Nakamura, Fumiya Nakata
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] Increase of spin-current in nano-constricted spin valves (2017)
  • Author(s): 稲見 翔，中村 瞭平，中田 記矢，湯浅 裕美
  • Organizer: 応用物理学会学術講演会
  • Place of Presentation: パシフィコ横浜
  • Year and Date: 2017-03-14
• [Presentation] Enhancement of spin mixing conductance and spin Hall angle in spin Seebeck effect (2017)
  • Author(s): H. Yuasa
  • Organizer: Program of Core-to-Core and Spintronics Workshop 2017
  • Int'l Joint Research / Invited
• [Presentation] Enhancement of spin mixing conductance and utilizing large spin Hall angle in spin Seebeck effect (2017)
  • Author(s): H. Yuasa
  • Organizer: York-Tohoku-Kaiserslautern Research Symposium on“New-Concept Spintronics Devices”
  • Int'l Joint Research / Invited
• [Presentation] Enhancement of Spin Mixing Conductance Enhancement of Spin Mixing Conductance Enhancement of Spin Mixing Conductance (2017)
  • Author(s): H. Yuasa
  • Organizer: 3rd Japan-Korea Spintronics Workshop
  • Int'l Joint Research / Invited
• [Presentation] Control of spin mixing conductance by ferromagnetic layer insertion into YIG/Pt interface (2017)
  • Author(s): Ryohei Nakamura, Sho Inami, Fumiya Nakata, Hiromi Yuasa
  • Organizer: 第64回応用物理学会春季学術講演会
• [Presentation] Spin Seebeck voltage enhancement by large spin Hall angle materials (2017)
  • Author(s): Fumiya Nakata, Ryohei Nakamura, Sho Inami, Hiromi Yuasa
  • Organizer: 第64回応用物理学会春季学術講演会
• [Presentation] Increase of spin current in nano-constricted spin valves (2017)
  • Author(s): Sho Inami, Ryohei Nakamura, Fumyia Nakata, Hiromi Yuasa
  • Organizer: 第64回応用物理学会春季学術講演会
• [Presentation] Spin-current detection in magnetic multilayer with nano-constricted region (2017)
  • Author(s): Sho Inami, Ryohei Nakamura, Fumiya Nakata and Hiromi Yuasa
  • Organizer: SpinTECH IX
  • Int'l Joint Research
• [Presentation] Enhancement of spin mixing conductance by ferromagnetic layer (2017)
  • Author(s): Ryohei Nakamura，Sho Inami，Fumiya Nakata
  • Organizer: SpinTECH IX
  • Int'l Joint Research
• [Presentation] Spin Seebeck voltage enhancement by Ta50W50 with large spin Hall angle (2017)
  • Author(s): Fumiya Nakata, Ryohei Nakamura, Sho Inami, Hiromi Yuasa
  • Organizer: SpinTECH IX
  • Int'l Joint Research
• [Presentation] Measurement of XMCD and XAS of Pt in YIG/M/Pt (2017)
  • Author(s): Ryohei Nakamura, Fumiya Nakata, Gen Nagashima, Sho Inami, Yudai Hirayama, Motohiro Suzuki, Yuichiro Kurokawa, Hiromi Yuasa
  • Organizer: 第78回応用物理学会秋季学術講演会
• [Presentation] Spin Seebeck voltage enhancement by Ta50W50 with large spin Hall angle (2017)
  • Author(s): Fumiya Nakata, Ryohei Nakamura, Sho Inami, Hiromi Yuasa
  • Organizer: 強的秩序とその操作に関わる研究グループ第５回研究会
• [Presentation] Measurement of XMCD and XAS of Pt in YIG/M/Pt (M=Cr, Ni_80 Fe_20, Co_90 Fe_10, Fe_50 Co_50 and Fe) (2017)
  • Author(s): Ryohei Nakamura, Fumiya Nakata, Gen Nagashima, Sho Inami1, Yudai Hirayama, Motohiro Suzuki, Yuichiro Kurokawa, Hiromi Yuasa
  • Organizer: 強的秩序とその操作に関わる研究グループ第５回研究会
• [Presentation] 酸化物磁性体/非磁性金属界面へのRu挿入によるスピンゼーベック起電力の増加 (2017)
  • Author(s): 中田記矢，中村瞭平，稲見翔，湯浅裕美
  • Organizer: 第41回日本磁気学会学術講演会
• [Presentation] Spin Seebeck voltage enhancement by using Ta50W50 alloy and YIG/Ru interface (2017)
  • Author(s): H. Yuasa, F. Nakata, R. Nakamura, S. Inami and Y. Kurokawa
  • Organizer: MMM2017
  • Int'l Joint Research
• [Presentation] Spin Seebeck voltage improvement of Y3Fe5O12/ ultra-thin magnetic layer/Pt and XMCD and XAS investigation for Pt (2017)
  • Author(s): H. Yuasa, R. Nakamuram, M. Suzuki, F. Nakata, G. Nagashima, Y. Hirayama, S. Inami and Y. Kurokawa
  • Organizer: MMM2017
  • Int'l Joint Research