中国物理B ›› 2009, Vol. 18 ›› Issue (5): 2006-2011.doi: 10.1088/1674-1056/18/5/046

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Symmetry ensemble theory of spin wave emitting effectdriven by current in nanoscale magnetic multilayer

任敏, 张磊, 胡九宁, 董浩, 邓宁, 陈培毅   

  1. Institute of Microelectronics, Tsinghua University, Tsinghua National Laboratory for Information Science and Technology, Beijing 100084, China
  • 收稿日期:2008-10-21 修回日期:2008-11-04 出版日期:2009-05-20 发布日期:2009-05-20
  • 基金资助:
    Project supported by Major State Basic Research Development Program of China (Grant No 2006CB921106), the National Natural Science Foundation of China (Grant No 60606021) and the Specialized Research Fund for the Doctoral Program of Higher Education of Ch

Symmetry ensemble theory of the spin wave emitting effect driven by current in nanoscale magnetic multilayer

Ren Min(任敏), Zhang Lei(张磊), Hu Jiu-Ning(胡九宁), Dong Hao(董浩), Deng Ning(邓宁), and Chen Pei-Yi(陈培毅)†   

  1. Institute of Microelectronics, Tsinghua University, Tsinghua National Laboratory for Information Science and Technology, Beijing 100084, China
  • Received:2008-10-21 Revised:2008-11-04 Online:2009-05-20 Published:2009-05-20
  • Supported by:
    Project supported by Major State Basic Research Development Program of China (Grant No 2006CB921106), the National Natural Science Foundation of China (Grant No 60606021) and the Specialized Research Fund for the Doctoral Program of Higher Education of Ch

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摘要： This paper proposes a symmetry ensemble model for the magnetic dynamics caused by spin transfer torque in nanoscale pseudo-spin-valves, in which individual spin moments in the free layer are considered as subsystems to form a spinor ensemble. The magnetization dynamics equation of the ensemble was developed. By analytically investigating the equation, many magnetization dynamics properties excited by polarized current reported in experiments, such as double spin wave modes and the abrupt frequency jump, can be successfully explained. It is pointed out that an external field is not necessary for spin wave emitting (SWE) and a novel perpendicular configuration structure can provide much higher SWE efficiency in zero magnetic field.

关键词: symmetry ensemble model, spin wave emitting, spin transfer torque, nanoscale magnetic multilayer

Abstract: This paper proposes a symmetry ensemble model for the magnetic dynamics caused by spin transfer torque in nanoscale pseudo-spin-valves, in which individual spin moments in the free layer are considered as subsystems to form a spinor ensemble. The magnetization dynamics equation of the ensemble was developed. By analytically investigating the equation, many magnetization dynamics properties excited by polarized current reported in experiments, such as double spin wave modes and the abrupt frequency jump, can be successfully explained. It is pointed out that an external field is not necessary for spin wave emitting (SWE) and a novel perpendicular configuration structure can provide much higher SWE efficiency in zero magnetic field.

Key words: symmetry ensemble model, spin wave emitting, spin transfer torque, nanoscale magnetic multilayer

中图分类号:  (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))

  • 75.70.Cn
72.25.Mk (Spin transport through interfaces) 75.30.Ds (Spin waves) 75.40.Mg (Numerical simulation studies) 75.50.Tt (Fine-particle systems; nanocrystalline materials) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)