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2007 | 112 | 6 | 1267-1270
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Current-Driven Magnetoresistance Oscillations in Asymmetric Spin Valves

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Within the macroscopic model we have calculated spin-transfer torque in asymmetric spin valves in the diffusive transport limit.Such systems exhibit a non-standard angular dependence of the torque, which leads to current-induced precessional modes at zero external magnetic field. We have found that the frequency of magnetoresistance oscillations exhibits hysteretic behavior when the system is driven between two steady precessional regimes. A finite temperature can suppress the irreversibility and give rise to bistable regime where, both the precessional regimes coexist.
  • Department of Theoretical Physics and Astrophysics, P.J. Š afárik University, Park Angelinum 9, 040 01 KoŠ ice, Slovak Republic
  • Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany
  • Department of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
  • Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland
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