Characterization of high spin polarization materials using soft x-ray magnetic circular dichroism and soft x-ray scattering

2009 Fiscal Year Self-evaluation Report

• Project Area: Creation and control of spin current
• Project/Area Number: 19048012
• 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: FUJIMORI Atsushi The University of Tokyo, 大学院・理学系研究科, 教授 (10209108)
• Project Period (FY): 2007 – 2010
• Keywords: 磁性半導体 / 超構造 / 軟X線磁気円二色性 / 軟X線共鳴散乱 / 光電子分光

Research Abstract

放射光軟X線を用いた磁気円二色性(XMCD)測定により,元素ごとの磁性,強磁性・常磁性・反強磁性成分に関与する原子の価数・結晶場を明らかにする,また,軟X線共鳴散乱の測定により,特定の元素・価数・結晶場・磁性をもつ遷移金属原子の空間分布,伝導電子の空間分布を逆格子空間で調べる.XMCD測定は高エネルギー加速器研究機構Photon Facotry (KEK-PF)とSPring-8で行う.軟X線共鳴散乱の装置開発と測定はPFで行う.研究対象は次の通りである:
(1) 化学組成・キャリアー数を制御した磁性半導体,高温強磁性が報告されている半導体のXMCDによるキャラクタリゼーション.
(2) 界面・超構造の磁性の,XMCDを用いたキャラクタリゼーション.
(3) ホイスラー合金を中心とした金属系高スピン偏極材料の元素選択的XMCD.
(4) 軟X共鳴散乱を用いた半導体・合金系高スピン偏極材料中の不均一な元素・価数・磁化・キャリアー分布の研究,界面・超構造における元素・価数・磁化・キャリアー分布の研究.

Research Products

• [Journal Article] Electronic Structure and Magnetism of the Diluted Magnetic Semiconductor Fe-Doped ZnO Nano-Particles (2010)
  • Author(s): T. Kataoka, M. Kobayashi, Y. Sakamoto, G.S. Song, A. Fujimori, F.-H. Chang, H.-J. Lin, D.J. Huang, C.T. Chen, T. Ohkochi, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, A. Tanaka, S.K. Mandal, T.K. Nath, D. Karmakar, I. Dasgupta
  • Journal Title: J. Appl. Phys. 107 Pages: 033718-1-7
  • Peer Reviewed
• [Journal Article] Antiferromagnetic Interaction between Paramagnetic Co Ions in the Diluted Magnetic Semiconductor Zn1-xCoxO (2010)
  • Author(s): M. Kobayashi. Y. Ishida, J.I. Hwang, Y. Osafune, A. Fujimori, Y. Takeda, T. Okane, Y. Saitoh, K. Kobayashi, H. Saeki, T. Kawai, H. Tabata
  • Journal Title: Phys. Rev. B 81 Pages: 075204-1-7
  • Peer Reviewed
• [Journal Article] Nature of Magnetic Coupling between Mn Ions in As-Grown Ga1-xMnxAs Studied by X-Ray Magnetic Circular Dichroism (2008)
  • Author(s): Y. Takeda, M. Kobayashi, T. Okane, T. Ohkochi, J. Okamoto, Y. Saitoh, K. Kobayashi, H. Yamagami, A. Fujimori, A. Tanaka, J. Okabayashi, M. Oshima, S. Ohya, P.N. Hai, M. Tanaka
  • Journal Title: Phys. Rev. Lett. 100 Pages: 247202-1-4
  • Peer Reviewed
• [Journal Article] X-Ray Magnetic Circular Dichroism Characterization of GaN/Ga1-xMnxN Digital Ferromagnetic Heterostructure (2007)
  • Author(s): J.I. Hwang, M. Kobayashi, G.S. Song, A. Fujimori, A. Tanaka, Z.S. Yang, H.-J. Lin, D.J. Huang, C.T. Chen, H.C. Jeon, T.W. Kang
  • Journal Title: Appl. Phys. Lett. 91 Pages: 072507-1-3
  • Peer Reviewed
• [Presentation] (2010)
  • Author(s): 藤森淳
  • Organizer: 放射光分光を用いたスピン源材料の磁性と電子状態の評価金属学会2010年度春期大会
  • Place of Presentation: 筑波大学
  • Year and Date: 2010-03-28
• [Presentation] Spectroscopic characterization of diluted ferromagnetic oxides and semiconductors, in "Magnetism, Superconductivity and Phase Transitions in Novel and Complex Materials" (2009)
  • Author(s): A. Fujimori
  • Place of Presentation: Kolkata
  • Year and Date: 20091111-20091114
• [Presentation] XMCD characterization of complex ferromagnetism in magnetic semiconductors and heterostructures, in "Polish-Japanese Joint Seminar "Ferromagnetism and Magnetic Nanostructures in Semiconductors" (2007)
  • Author(s): A. Fujimori
  • Place of Presentation: Warsaw
  • Year and Date: 20070927-20090928
• [Book] スピントロニクスの基礎と材料・応用技術の最前線(高梨弘毅監修, 放射光を用いたスピントロニクス材料の電子状態評価, 第25章) (2009)
  • Author(s): 藤森淳
  • Total Pages: 297
  • Publisher: シーエムシー出版