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Thickness dependence and the role of spin transfer torque in nonlinear giant magnetoresistance of permalloy dual spin valves

Banerjee, N. and Aziz, A. and Ali, M. and Robinson, J. W. A. and Hickey, B. J. and Blamire, M. G. (2010) Thickness dependence and the role of spin transfer torque in nonlinear giant magnetoresistance of permalloy dual spin valves. Physical review b, 82 (22). ISSN 1098-0121

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    Abstract

    The recent discovery of nonlinear current-dependent magnetoresistance in dual spin valve devices [A. Aziz, O. P. Wessely, M. Ali, D. M. Edwards, C. H. Marrows, B. J. Hickey, and M. G. Blamire, Phys. Rev. Lett. 103, 237203 (2009)] opens up the possibility for distinct physics which extends the standard model of giant magnetoresistance. When the outer ferromagnetic layers of a dual spin valve are antiparallel, the resulting accumulation of spin in the middle ferromagnetic layer strongly modifies its bulk and interfacial spin asymmetry and resistance. Here, we report experimental evidence of the role of bulk spin accumulation in this nonlinear effect and show that interfacial spin accumulation alone cannot account for the observed dependence of the effect on the thickness of the middle ferromagnetic layer. It is also shown that spin torque acting on the middle ferromagnetic layer combined with the nonlinear effect might be useful in understanding the dynamical features associated with the nonlinear behavior.

    Item Type: Article
    Journal or Publication Title: Physical review b
    Additional Information: © 2010 The American Physical Society
    Uncontrolled Keywords: TRANSPORT ; MULTILAYERS ; LAYERED MAGNETIC-STRUCTURES ; Nonlinear GMR ; Spintronics ; Nanomagnets ; Fabrication ; spin transfer torque
    Subjects:
    Departments: Faculty of Science and Technology > Physics
    ID Code: 63530
    Deposited By: ep_importer_pure
    Deposited On: 19 Apr 2013 11:16
    Refereed?: Yes
    Published?: Published
    Last Modified: 21 Nov 2017 18:31
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/63530

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