Current-Driven Magnetoresistance Oscillations in Asymmetric Spin Valves

• Authors: M. Gmitra , J. BarnaŚ
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

75.60.Ch; 75.70.Cn; 75.70.Pa

Discipline

• 75.60.Ch: Domain walls and domain structure(for magnetic bubbles and vortices, see 75.70.Kw)
• 75.70.Cn: Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 112
• Issue: 6
• Pages: 1267-1270

Dates

published

2007-12

received

2007-07-04

Contributors

author

M. Gmitra

• 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

author

J. BarnaŚ

• 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

References

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• 5. M. Gmitra, J. BarnaŚ, Phys. Rev. Lett. 96, 207205, (2006)
• 6. J. BarnaŚ, A. Fert, M. Gmitra, I. Weymann, V.K. Dugaev, Phys. Rev. B) 72, 024426, (2005)

Identifiers

DOI

10.12693/APhysPolA.112.1267