Thermal Stability in Uniaxial Nanomagnets Driven by Spin-Polarized Currents

Author

Serpico, C. ; Bonin, R. ; Bertotti, G. ; Mayergoyz, I.D. ; Aquino, M.D.

Author_Institution

Dipt. di Ingegneria Elettrica, Univ. di Napoli

Volume

42

Issue

10

fYear

2006

Firstpage

2679

Lastpage

2681

Abstract

Nanomagnets with uniaxial symmetry driven by spin-polarized currents are considered, in which anisotropy, applied field, and spin polarization are all aligned along the symmetry axis. Thermal fluctuations are taken into account by adding a Gaussian white noise stochastic term to the equation for the deterministic dynamics. The corresponding Fokker-Planck equation is derived. It is shown that the deterministic dynamics and the thermal relaxation are both governed by an effective potential including the effect of current injection

Keywords

Fokker-Planck equation; Gaussian noise; magnetic anisotropy; magnetic multilayers; spin polarised transport; thermal stability; white noise; Fokker-Planck equation; Gaussian white noise; Landau-Lifshitz-Gilbert equation; anisotropy; spin polarization; spin torque; spin-polarized currents; thermal fluctuations; thermal relaxation; thermal stability; uniaxial nanomagnets; uniaxial symmetry; Anisotropic magnetoresistance; Electrons; Equations; Fluctuations; Magnetic analysis; Polarization; Saturation magnetization; Temperature; Thermal stability; Torque; Landau–Lifshitz–Gilbert equation; spin torque; thermal fluctuations;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.879732

Filename

1704403