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Journal of Applied Physics / Volume 109 / Issue 7 / PROCEEDINGS OF THE 55TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Spin Transfer Torque

J. Appl. Phys. 109, 07C920 (2011); http://dx.doi.org/10.1063/1.3565396 (3 pages)

Effect of disorder on spin-transfer torque in magnetic tunnel junctions

Y.-H. Tang1,2, Nicholas Kioussis1, Alan Kalitsov1, and Roberto Car3

1Department of Physics, California State University, Northridge, California 91330-8268, USA
2Department of Physics, National Central University, Jung-Li 32001, Taiwan
3Department of Chemistry, Princeton University, Princeton, New Jersey 08544-0001, USA

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(Received 25 September 2010; accepted 21 December 2010; published online 14 April 2011)

We have generalized the nonequilibrium Green’s functions Keldysh formalism to study the effect of interfacial disorder on the average spin transfer torque, 〈T∥〉, in magnetic tunnel junctions (MTJs). We find a sinusoidal angular behavior of the average 〈T∥〉 as in ideal MTJs. We demonstrate for the first time that the general expression of the bias behavior of the average 〈T∥〉 in terms of the interplay of average spin current densities in collinear configurations is valid even in the presence of disorder. This explains the strong enhancement and sign reversal of 〈T∥〉 in the positive bias region, due to the disorder-induced resonance states at interface which selectively assist the transmission of right-coming electrons.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. METHOD
  3. RESULTS AND DISCUSSION
  4. CONCLUSION
  5. ACKNOWLEDGMENTS

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KEYWORDS and PACS

Keywords

Green's function methods, magnetic tunnelling, spin polarised transport

PACS

  • 72.25.Mk

    Spin transport through interfaces

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

  • 02.30.-f

    Function theory, analysis

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3565396

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

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    T. Birol and P. W. Brouwer, Phys. Rev. B. 80, 014434 (2009).

    A. Kalitsov, A. Coho, N. Kioussis, A. Vedyayev, M. Chshiev, and A. Granovsky, Phys. Rev. Lett. 93, 046603 (2004).


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