Establishing novel methods for spin current generation and manipulation

2009 Fiscal Year Self-evaluation Report

• Project Area: Creation and control of spin current
• Project/Area Number: 19048013
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: OTANI Yoshichika The University of Tokyo, 物性研究所, 教授 (60245610)
• Project Period (FY): 2007 – 2010
• Keywords: スピントロニクス / スピン注入 / スピン蓄積

Research Abstract

スピン依存伝導を駆動原理とするスピントロニクス素子の開発には、スピン流の生成、輸送、操作、蓄積、そして検出する手法を確立することが必要不可欠である。本研究課題では、スピン流の生成・操作に着目して以下の3つの研究課題に取り組んでいる。
課題1: 強磁性金属を用いない新規なスピン流生成法の一つとして着目されている巨大なスピンホール効果を示す物質探索とその機構解明。
課題2: スピン流の自由度の一つであるスピン偏極ベクトルの電気的制御方法の確立。
課題3: スピン蓄積量の増幅手法の確立を目指した、常伝導体とは異なる電子状態を有する超伝導体へのスピン注入及びスピン蓄積信号の測定手法の確立。

Research Products

• [Journal Article] Spin Hall effect in Molybdenum wires (2009)
  • Author(s): M. Morota, K. Ohnishi, T. Kimura, Y. Otani
  • Journal Title: J. Appl. Phys. 105 Pages: 07C712-1～3
  • Peer Reviewed
• [Journal Article] Giant spin-accumulation signal and pure spin-current-induced reversible magnetization switching (2008)
  • Author(s): T. Yang, T. Kimura, Y. Otani
  • Journal Title: Nature Physics 4 Pages: 851-4
  • Peer Reviewed
• [Journal Article] Improvement of superconductive properties of mesoscopic Nb wires by Ti passivation layers (2008)
  • Author(s): K. Ohnishi, T. Kimura, Y. Otani
  • Journal Title: Appl. Phys. Exp. 1 Pages: 021701-1～3
  • Peer Reviewed
• [Journal Article] Temperature evolution of spin relaxation in NiFe/Cu lateral spin valve (2008)
  • Author(s): T. Kimura, T. Sato, Y. Otani
  • Journal Title: Phys. Rev. Lett. 100 Pages: 066602-1～4
  • Peer Reviewed
• [Journal Article] Current-excited magnetization reversal under in-plane magnetic field in a nanoscaled ferromagnetic wire (2008)
  • Author(s): Y. Togawa, T. Kimura, K. Harada, T. Matsuda, A. Tonomura, Y. Otani, T. Akashi
  • Journal Title: Appl. Phys. Lett. 92 Pages: 012505-1～3
  • Peer Reviewed
• [Journal Article] Spin current absorption and spin Hall effects in ferromagnetic / nonmagnetic hybrid structures(invited) (2008)
  • Author(s): T. Kimura, Y. Otani, L. Vila
  • Journal Title: J. Appl. Phys. 103 Pages: 07F310-1～4
  • Peer Reviewed
• [Presentation] Pure-spin-current induced switching and interface contribution (invited) (2010)
  • Author(s): Y. Otani, T. Yang, Y. Fukuma, L. Wang
  • Organizer: 11th Joint MMM-Intermag Conference
  • Place of Presentation: Washington, D.C., USA
  • Year and Date: 20100100
• [Presentation] Pure-spin-current induced magnetization switching (invited) (2009)
  • Author(s): Y. Otani
  • Organizer: International Workshop on Magnonics: From Fundamentals to Applications
  • Place of Presentation: Dresden, Germany
  • Year and Date: 20090800
• [Presentation] Efficient spin accumulation and pure-spin-current-induced magnetization switching (invited) (2009)
  • Author(s): Y. Otani
  • Organizer: 0th International Colloquium on Magnetic Films and Surfaces
  • Place of Presentation: Berlin, Germany
  • Year and Date: 20090700
• [Presentation] Reversible spin Hall effects in metallic nano-structures(invited) (2008)
  • Author(s): Y. Otani
  • Organizer: 421st Wilhelm and Else Heraeus Seminar on Spin Hall Effect
  • Place of Presentation: Bad Honnef, Germany
  • Year and Date: 20081000
• [Presentation] Spin current generation and manipulation in magnetic and non-magnetic hybrid nano-structures(invited) (2008)
  • Author(s): Y. Otani
  • Organizer: Spin Phenomena in Reduced Dimensions
  • Place of Presentation: Regensburg, Germany
  • Year and Date: 20080900
• [Patent(Industrial Property Rights)] メモリセル、ならびに、磁気メモリ素子 (2008)
  • Inventor(s): 福間康裕、楊涛、木村崇、大谷義近
  • Industrial Property Rights Holder: 独立行政法人理化学研究所
  • Industrial Property Number: 特願2008-270223
  • Filing Date: 2008-10-17