Effects of spin accumulation in magnetic multilayers

被引:28
作者
Heide, C [1 ]
机构
[1] NYU, Dept Phys, New York, NY 10003 USA
关键词
D O I
10.1103/PhysRevB.65.054401
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The diffusion equation for the spin accumulation in magnetic multilayers is extended to capture the time-dependent buildup of spin accumulation as well as the influence of an external field and arbitrary magnetization orientations on the spin accumulation. One obtains a consistent formulation for spin accumulation that can explain such important effects as spin injection, spin filtering, and spin transfer on an equal footing. Spin transfer is determined by the amount of spin accumulation at the interfaces whereas spin filtering by the departure from collinear magnetization orientations. The noncollinear magnetization orientations lead to a spatial decay of the spin accumulation in the transverse direction of the multilayer plane. Spin filtering can thus be associated with a new length scale in the transverse direction. Moreover, spin filtering is in correspondence with a biquadratic coupling between layers and changes in the angular dependence of the giant magnetoresistance. What is interesting is that spin filtering is not a prerequisite to spin transfer. Different scenarios for current-induced magnetization reversal are discussed in which, depending largely on the geometry of the magnetic. multilayer, either spin injection or spin transfer will be dominant.
引用
收藏
页码:1 / 17
页数:17
相关论文
共 55 条
[1]   Spin-polarized current switching of a Co thin film nanomagnet [J].
Albert, FJ ;
Katine, JA ;
Buhrman, RA ;
Ralph, DC .
APPLIED PHYSICS LETTERS, 2000, 77 (23) :3809-3811
[2]   Current hysteresis due to changes in magnetization of magnetic tunnel junctions by spin-polarized current [J].
Baranov, AM ;
Chmil, AI ;
Elliott, RJ ;
Feigin, LA ;
Gulyaev, YV ;
Heide, C ;
Krikunov, AI ;
Kudryavtsev, VV ;
Ogrin, YF ;
Sklizkova, VP ;
Stepina, ND ;
Zilberman, PE .
EUROPHYSICS LETTERS, 2001, 53 (05) :625-631
[3]   Modification of the Landau-Lifshitz equation in the presence of a spin-polarized current in colossal- and giant-magnetoresistive materials [J].
Bazaliy, YB ;
Jones, BA ;
Zhang, SC .
PHYSICAL REVIEW B, 1998, 57 (06) :R3213-R3216
[4]   New origin for spin current and current-induced spin precession in magnetic multilayers [J].
Berger, L .
JOURNAL OF APPLIED PHYSICS, 2001, 89 (10) :5521-5525
[5]   Emission of spin waves by a magnetic multilayer traversed by a current [J].
Berger, L .
PHYSICAL REVIEW B, 1996, 54 (13) :9353-9358
[6]   Spin coherence and dephasing in GaN [J].
Beschoten, B ;
Johnston-Halperin, E ;
Young, DK ;
Poggio, M ;
Grimaldi, JE ;
Keller, S ;
DenBaars, SP ;
Mishra, UK ;
Hu, EL ;
Awschalom, DD .
PHYSICAL REVIEW B, 2001, 63 (12)
[7]  
Callen H. B., 1960, THERMODYNAMICS
[8]   ELECTRON-TRANSPORT IN MAGNETIC INHOMOGENEOUS-MEDIA [J].
CAMBLONG, HE ;
LEVY, PM ;
ZHANG, SF .
PHYSICAL REVIEW B, 1995, 51 (22) :16052-16072
[9]   Angular dependence of the perpendicular giant magnetoresistance of multilayers [J].
Dauguet, P ;
Gandit, P ;
Chaussy, J ;
Lee, SF ;
Fert, A ;
Holody, P .
PHYSICAL REVIEW B, 1996, 54 (02) :1083-1087
[10]   THEORY OF THE EFFECT OF SPIN-ORBIT COUPLING ON MAGNETIC RESONANCE IN SOME SEMICONDUCTORS [J].
ELLIOTT, RJ .
PHYSICAL REVIEW, 1954, 96 (02) :266-279