Theoretical study on the magnetic structures at the interfaces of magnetic multi-layers and the spin dynamics

2008 Fiscal Year Final Research Report

• Project/Area Number: 19560006
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Applied materials science/Crystal engineering
• Research Institution: Tohoku University
• Principal Investigator: SAKUMA Akimasa Tohoku University, 大学院・工学研究科, 教授 (30361124)
• Co-Investigator(Kenkyū-buntansha): TSUCHIURA Hiroki 東北大学, 大学院・工学研究科, 助教 (30374961)
• Project Period (FY): 2007 – 2008
• Keywords: 磁性体 / スピントロニクス / 磁性薄膜 / GMT,TMR

Research Abstract

強磁性(FM)/非磁性(NM)あるいは強磁性(FM)/反強磁性(AF)界面における電子状態と磁気構造を明らかにする目的で、磁気モーメントのノンコリニア配列とスピン軌道相互作用の両者を効果を考慮した電子状態計算プログラムを作成した。本手法により、任意の磁気構造の予測とその安定性、および結晶磁気異方性エネルギーなどの評価が可能となった。

Research Products

• [Journal Article] Theoretical study on the stability of magnetic structures of Heusler alloys (2009)
  • Author(s): A. Sakuma, Y. Toga, and H. Tsuchiura
  • Journal Title: Co2MnAland Co2MnSi, Journal of Applied Physics 105 Pages: 07C910-1-07C910-3
  • Peer Reviewed
• [Journal Article] Spin-polarized electronic structures and transport properties of Fe-Co alloys (2009)
  • Author(s): Y. Kota, T. Takahashi, H. Tsuchiura and A. Sakuma
  • Journal Title: Journal of Applied Physics 105 Pages: 07B716-1-07B716-3
  • Peer Reviewed
• [Journal Article] First-Principles Calculation of the Crystal Field Parameter near the Surfaces and Interfaces of Nd2Fe14B (2009)
  • Author(s): H. Moriya, H. Tsuchiura, and A. Sakuma
  • Journal Title: Journal of Applied Physics 105 Pages: 07A740-1-07A740-3
  • Peer Reviewed
• [Journal Article] Ab-initio Study on the Magnetic Structures in the Ordered Mn3Pt Alloy (2008)
  • Author(s): Yohei Kota, Hiroki Tsuchiura, and Akimasa Sakuma
  • Journal Title: IEEE TRANSACTIONS ON MAGNETICS 44 (11) Pages: 3131-3133
  • Peer Reviewed
• [Journal Article] Evidence of local moment formation in Co-based Heusler alloys (2008)
  • Author(s): N. D. Telling, P. S. Keatley, G. van der Laan, R. J. Hicken, E. Arenholz, Y. Sakuraba, M. Oogane, Y. Ando, K. Takanashi, A. Sakuma and T. Miyazaki
  • Journal Title: Physical Review B 78 Pages: 184438-1-184438-7
  • Peer Reviewed
• [Journal Article] Critical Thickness of Antiferromagnetic Layer in Exchange Biasing Bilayer System (2008)
  • Author(s): C. Mitsumata, A. Sakuma, K. Fukamichi, M. Tsunoda, and M. Takahashi
  • Journal Title: Journal of the Physical Society of Japan 77(4) Pages: 044602-1-044602-6
  • Peer Reviewed
• [Journal Article] Impurity-induced states in inhomogeneous superconductivity in high-Tc cuprates Journal of Physics : Conference Series (2008)
  • Author(s): H. Tsuchiura, A. Sakuma and K. Takaki
  • Journal Title: 108 Pages: 012035-1 - 012035-4
  • Peer Reviewed
• [Journal Article] Uniaxial magnetic anisotropy in Co and Co-Pt based perpendicular olms in relation to lattice deformation (2008)
  • Author(s): T. Shimatsu, Y. Okazaki, H. Sato, H. Muraoka, H. Aoi, T. Sakurai, S. Okamoto, O. Kitakami, S. Tanii and A. Sakuma
  • Journal Title: Journal of Applied Physics 103 Pages: 07F524-1-07F524-3
  • Peer Reviewed
• [Journal Article] Magnetic properties, phase stability, electronic structure, and half-metallicity of L21-type Co2(V1-xMnx)Ga Heusler alloys (2008)
  • Author(s): R. Y. Umetsu, K. Kobayashi, A. Fujita, R. Kainuma, K. Ishida, K. Fukamichi, and A. Sakuma
  • Journal Title: Physical Review B 77 Pages: 104422-1-104422-8
  • Peer Reviewed
• [Journal Article] Electronic Structures and Magnetic Phase Stability of L10 and B2-Type MnRh Equiatomic Alloys (2007)
  • Author(s): R. Y. Umetsu, K. Fukamichi and A. Sakuma
  • Journal Title: Journal of the Physical Society of Japan 76(10) Pages: 104712-1-104712-6
  • Peer Reviewed
• [Journal Article] Theoretical study of a localized quantum spin reversal by the sequential injection of spins in a spin quantum dot (2007)
  • Author(s): S. Kokado, K. Ueda, K. Harigaya, and A. Sakuma
  • Journal Title: Physical Review B 76 Pages: 54451-1-54451-11
  • Peer Reviewed
• [Journal Article] Localized quantum spin reversal by spin injection in a spin quantum dot: A model calculation (2007)
  • Author(s): S. Kokado, K. Ueda, K. Harigaya, and A. Sakuma
  • Journal Title: phys. stat. sol. (a) 204(6) Pages: 1937-1943
  • Peer Reviewed
• [Journal Article] Decoherence processes of a quantum two-level system coupled to a fermionic environment (2007)
  • Author(s): N. Yamada, A. Sakuma and H. Tsuchiura
  • Journal Title: Journal of Applied Physics 101 Pages: 09C110-1-09C110-3
  • Peer Reviewed
• [Journal Article] Inhomogeneous electronic states due to out-of-plane disorder in the t-t'-J model (2007)
  • Author(s): H. Tsuchiura, K. Takaki, S. Kashiwaya, A. Sakuma
  • Journal Title: Journal of Magnetism and Magnetic Materials 310 Pages: 514-516
  • Peer Reviewed
• [Journal Article] Half-metallic band structure observed in Co2MnSi-based magnetic tunnel junctions (2007)
  • Author(s): Y Sakuraba, M Hattori, M Oogane, H Kubota, Y Ando, A Sakuma and T Miyazaki
  • Journal Title: Journal of Physics D : Applied Physics 40 Pages: 1221-1227
  • Peer Reviewed
• [Journal Article] Exchange Bias of Antiferromagnetic/Ferromagnetic Bilayer with Cubic Anisotropy in Antiferromagnetic Layer (2007)
  • Author(s): C. Mitsumata, A. Sakuma and K. Fukamichi
  • Journal Title: Journal of Physical Society of Japan 76 (2) Pages: 024704-1-024704-7
  • Peer Reviewed
• [Presentation] Nd_2Fe_<14>B磁石の界面における結晶場の第一原理的評価 (2009)
  • Author(s): 土浦宏紀, 栂裕太、守谷浩志、佐久間昭正
  • Organizer: 日本金属学会2009年春季大会
  • Place of Presentation: 東京
  • Year and Date: 2009-03-29
• [Presentation] 遷移金属合金の電気伝導度とスピン分極率の第一原理計算 (2009)
  • Author(s): 佐久間昭正、小田洋平、土浦宏紀
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 東京
  • Year and Date: 2009-03-28
• [Presentation] Nd_2Fe_<14>Bにおける結晶場パラメータの第一原理的評価 (2008)
  • Author(s): 守谷浩志、土浦宏紀, 佐久間昭正
  • Organizer: 応用物理学会東北支部第63回学術講演会
  • Place of Presentation: 仙台
  • Year and Date: 2008-12-05
• [Presentation] Microscopic description of the Gilbert damping coefficient based on the s-d model (2008)
  • Author(s): A. Sakuma, N. Yamada, and H. Tsuchiura
  • Organizer: MMM 53rd Magnetism and Magnetic Materials Conference
  • Place of Presentation: Austin, USA.
  • Year and Date: 2008-11-13
• [Presentation] First-principles calculations for the electrical conductivities of transition metal alloys (2008)
  • Author(s): A. Sakuma, T. Takahashi, Y. Kota, and H. Tsuchiura
  • Organizer: MMM 53rd Magnetism and Magnetic Materials Conference
  • Place of Presentation: Austin, USA.
  • Year and Date: 2008-11-12
• [Presentation] Spin-polarized electronic structures and transport properties of Fe-Co alloys : ab initio study (2008)
  • Author(s): Y. Kota, T. Takahashi, H. Tsuchiura, and A. Sakuma
  • Organizer: MMM 53rd Magnetism and Magnetic Materials Conference
  • Place of Presentation: Austin, USA.
  • Year and Date: 2008-11-12
• [Presentation] Brillouin Light Scattering Investigations on Co_2MnAl_xSi_<1-x> Heusler Thin Films (2008)
  • Author(s): T. Kubota, J. Hamrle, Y. Sakuraba, O. Gaier, M. Oogane, A. Sakuma, B. Hillebrands, K. Takanashi, and Y. Ando
  • Organizer: MMM 53rd Magnetism and Magnetic Materials Conference
  • Place of Presentation: Austin, USA.
  • Year and Date: 2008-11-12
• [Presentation] Theoretical study on the stability of magnetic structures of Heusler alloys (2008)
  • Author(s): A. Sakuma, Y. Toga, and H. Tsuchiura
  • Organizer: Co_2MnAland Co_2MnSi, MMM 53rd Magnetism and Magnetic Materials Conference
  • Place of Presentation: Austin, USA.
  • Year and Date: 2008-11-12
• [Presentation] irst-Principles Calculation of the Crystal Field Parameter near the Surfaces and Interfaces of Nd_2Fe_<14>B (2008)
  • Author(s): H. Moriya, H. Tsuchiura and A. Sakuma
  • Organizer: MMM 53rd Magnetism and Magnetic Materials Conference
  • Place of Presentation: Austin, USA.
  • Year and Date: 2008-11-12
• [Presentation] Nd_2Fe_<14>B/α-Fe交換スプリング磁石の界面近傍における磁気特性の第一原理計算 (2008)
  • Author(s): 栂裕太, 土浦宏紀, 佐久間昭正
  • Organizer: 第32回日本磁気学会学術講演会
  • Place of Presentation: 仙台
  • Year and Date: 2008-09-15
• [Presentation] Mn3Pt/Co界面の磁気構造に関する第一原理計算 (2008)
  • Author(s): 小田洋平, 土浦宏紀, 佐久間昭正
  • Organizer: 第32回日本磁気学会学術講演会
  • Place of Presentation: 仙台
  • Year and Date: 2008-09-15
• [Presentation] Fe_<1-x>NiX合金の電気伝導度の第一原理計算, (2008)
  • Author(s): 佐久間昭正、高橋智洋, 土浦宏紀
  • Organizer: 第32回日本磁気学会学術講演会
  • Place of Presentation: 仙台
  • Year and Date: 2008-09-14
• [Presentation] Ab initio study on the magnetic structures in the ordered Mn3Pt alloy (2008)
  • Author(s): Y.Kota, H. Tsuchiura and A. Sakuma
  • Organizer: INTERMAG 2008
  • Place of Presentation: Madrid, Spain
  • Year and Date: 2008-05-08
• [Presentation] Enhancement of Gilbert damping due to non-local spin-spin correlation via spin currents (2007)
  • Author(s): K. Hasu, H. Tsuchiura, and A. Sakuma
  • Organizer: 52nd Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Tampa Marriott Hotel, USA.
  • Year and Date: 2007-11-07