Current-induced dynamics in noncollinear dual spin valves

被引：17
作者：
Balaz, P. [1 ]
Gmitra, M. [2 ]
Barnas, J. [1 ,3 ]
机构：
[1] Adam Mickiewicz Univ Poznan, Dept Phys, PL-61614 Poznan, Poland
[2] Safarik Univ, Inst Phys, Kosice 04001, Slovakia
[3] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 17期
关键词：
critical currents; magnetic moments; magnetic multilayers; magnetic structure; magnetic thin films; spin dynamics; spin polarised transport; spin valves; MAGNETIC MULTILAYERS; DRIVEN;
D O I：
10.1103/PhysRevB.80.174404
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Spin-transfer torque and current-induced spin dynamics in spin-valve nanopillars with the free magnetic layer located between two magnetic films of fixed magnetic moments is considered theoretically. The spin-transfer torque in the limit of diffusive spin transport is calculated as a function of magnetic configuration. It is shown that noncollinear magnetic configuration of the outermost magnetic layers has a strong influence on the spin torque and spin dynamics of the central free layer. Employing macrospin simulations we make some predictions on the free layer spin dynamics in spin valves composed of various magnetic layers. We also present a formula for critical current in noncollinear magnetic configurations, which shows that the magnitude of critical current can be several times smaller than that in typical single spin valves.
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页数：6
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共 18 条
  • [1] Current-pulse-induced magnetic switching in standard and nonstandard spin-valves: Theory and numerical analysis
    Balaz, P.
    Gmitra, M.
    Barnas, J.
    [J]. PHYSICAL REVIEW B, 2009, 79 (14):
  • [2] From giant magnetoresistance to current-induced switching by spin transfer
    Barnas, J
    Fert, A
    Gmitra, M
    Weymann, I
    Dugaev, VK
    [J]. PHYSICAL REVIEW B, 2005, 72 (02)
  • [3] Multilayer configuration for experiments of spin precession induced by a dc current
    Berger, L
    [J]. JOURNAL OF APPLIED PHYSICS, 2003, 93 (10) : 7693 - 7695
  • [4] Emission of spin waves by a magnetic multilayer traversed by a current
    Berger, L
    [J]. PHYSICAL REVIEW B, 1996, 54 (13): : 9353 - 9358
  • [5] Shaped angular dependence of the spin-transfer torque and microwave generation without magnetic field
    Boulle, O.
    Cros, V.
    Grollier, J.
    Pereira, L. G.
    Deranlot, C.
    Petroff, F.
    Faini, G.
    Barnas, J.
    Fert, A.
    [J]. NATURE PHYSICS, 2007, 3 (07) : 492 - 497
  • [6] Microwave excitations associated with a wavy angular dependence of the spin transfer torque: Model and experiments
    Boulle, O.
    Cros, V.
    Grollier, J.
    Pereira, L. G.
    Deranlot, C.
    Petroff, F.
    Faini, G.
    Barnas, J.
    Fert, A.
    [J]. PHYSICAL REVIEW B, 2008, 77 (17):
  • [7] Current-driven destabilization of both collinear configurations in asymmetric spin valves
    Gmitra, M.
    Barnas, J.
    [J]. PHYSICAL REVIEW LETTERS, 2006, 96 (20)
  • [8] Current-induced dynamics in asymmetric spin valves
    Gmitra, Martin
    Barnas, Jozef
    [J]. APPLIED PHYSICS LETTERS, 2006, 89 (22)
  • [9] JAROMIRSKA E, ARXIV09073384CONDMAT
  • [10] Current-driven magnetization reversal and spin-wave excitations in Co/Cu/Co pillars
    Katine, JA
    Albert, FJ
    Buhrman, RA
    Myers, EB
    Ralph, DC
    [J]. PHYSICAL REVIEW LETTERS, 2000, 84 (14) : 3149 - 3152
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