Thermally Assisted Current-Driven Dynamics in Asymmetric Spin Valves

• Authors: M. Gmitra , J. Barnaś , D. Horváth
• Languages of publication: EN

Abstracts

EN

Current-induced steady precessional modes in standard spin valves are usually excited as an interplay of spin-transfer torque, Gilbert damping, and external magnetic field. We propose an asymmetric spin valve, in which the spin current can excite stationary precessional modes also at zero external magnetic field. We also show that finite temperature can induce transitions between different dynamical modes. These transitions, in turn, lead to telegraph noise in magnetoresistance.

Keywords

EN

75.60.Ch; 75.70.Cn

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: 2008
• Volume: 113
• Issue: 1
• Pages: 31-34

Dates

published

2008-01

received

2007-07-09

Contributors

author

M. Gmitra

• Department of Theoretical Physics and Astrophysics, P.J.Šafárik University, Park Angelinum 9, 040 01 Košice, Slovak Republic
• Inst. for Theor. 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

author

D. Horváth

• Department of Theoretical Physics and Astrophysics, P.J.Šafárik University, Park Angelinum 9, 040 01 Košice, Slovak Republic

References

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• 2. J.A. Katine, F.J. Albert, R.A. Buhrman, E.B. Myers, D.C. Ralph, Phys. Rev. Lett. 84, 3149 (2000)
• 3. M. Gmitra, J. Barnaś, Phys. Rev. Lett. 96, 207205 (2006)
• 4. J.Z. Sun, Phys. Rev. B 62, 570 (2000)
• 5. J. Barnaś, A. Fert, M. Gmitra, I. Weymann, V.K. Dugaev, Phys. Rev. B 72, 024426 (2005)
• 6. Z. Li, S. Zhang, Phys. Rev. B 69, 134416 (2004)

Identifiers

DOI

10.12693/APhysPolA.113.31