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.
Received: 21 October 2008
Revised: 04 November 2008
Accepted manuscript online:
PACS:
75.70.Cn
(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: 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
Cite this article:
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) Symmetry ensemble theory of the spin wave emitting effect driven by current in nanoscale magnetic multilayer 2009 Chin. Phys. B 18 2006
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