Analytical study of magnetization dynamics driven by spin-polarized currents

被引：20

作者：

Bonin, R. ^{[1
]}

Serpico, C. ^{[2
]}

Bertotti, G. ^{[1
]}

Mayergoyz, I. D. ^{[3
]}

d'Aquino, M. ^{[4
]}

机构：

[1] Ist Nazl Ric Metrol, I-10135 Turin, Italy

[2] Univ Naples Federico II, Dipartimento Ingn Elettr, I-80125 Naples, Italy

[3] Univ Maryland, Dept Elect & Comp Engn, College Pk, MD 20742 USA

[4] Univ Napoli Parthenope, Dipartimento Tecnol, I-80133 Naples, Italy

来源：

EUROPEAN PHYSICAL JOURNAL B | 2007年 / 59卷 / 04期

关键词：

D O I：

10.1140/epjb/e2007-00051-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

An analytical approach is presented for the study of magnetization dynamics driven by spin-polarized currents. Two cases are considered: (i) magnetic layers with in-plane uniaxial anisotropy; (ii) magnetic layers with uniaxial anisotropy and applied field perpendicular to the layer plane. Theoretical predictions are obtained for the existence of stationary modes and self-oscillations of magnetization by solving the deterministic Landau-Lifshitz-Gilbert equation with Slonczewski spin-torque term. Thermal fluctuations are studied by deriving the corresponding Fokker-Planck equation for the magnetization probability distribution. Analytical procedures to estimate the effective potential barrier separating selfoscillatory regimes and/or stationary modes are proposed.

引用

页码：435 / 445

页数：11

共 42 条

[1] EFFECT OF A MAGNETIC FIELD ON SUPERPARAMAGNETIC RELAXATION TIME [J].