Current-induced spin torque in a nanomagnet

被引：25

作者：

Waintal, X ^{[1
]}

Parcollet, O ^{[1
]}

机构：

[1] CEA Saclay, Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.94.247206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In a nanomagnet, very small polarized currents can lead to magnetic reversal. Treating on the same footing the transport and magnetic properties of a nanomagnet connected to magnetic leads via tunneling barriers, we derive a closed equation for the time evolution of the magnetization. The interplay between Coulomb blockade phenomena and magnetism gives some additional structure to the current-induced spin torque. In addition to the possibility of stabilizing uniform spin precession states, we find that the system is highly hysteretic: up to three different magnetic states can be simultaneously stable in one region of the parameter space (magnetic field and bias voltage).

引用

页数：4

共 24 条

[1] Minimum field strength in precessional magnetization reversal [J].

Back, CH ;

Allenspach, R ;

Weber, W ;

Parkin, SSP ;

Weller, D ;

Garwin, EL ;

Siegmann, HC .

SCIENCE, 1999, 285 (5429) :864-867

[2] THEORY OF COULOMB-BLOCKADE OSCILLATIONS IN THE CONDUCTANCE OF A QUANTUM DOT [J].

BEENAKKER, CWJ .

PHYSICAL REVIEW B, 1991, 44 (04) :1646-1656

[3] Theory of transport through quantum-dot spin valves in the weak-coupling regime -: art. no. 195345 [J].

Braun, M ;

König, J ;

Martinek, J .

PHYSICAL REVIEW B, 2004, 70 (19) :1-12

[4] Theory of tunneling spectroscopy in ferromagnetic nanoparticles [J].

Canali, CM ;

MacDonald, AH .

PHYSICAL REVIEW LETTERS, 2000, 85 (26) :5623-5626

[5] Magnetic anisotropy variations and nonequilibrium tunneling in a cobalt nanoparticle -: art. no. 226801 [J].

Deshmukh, MM ;

Kleff, S ;

Guéron, S ;

Bonet, E ;

Pasupathy, AN ;

von Delft, J ;

Ralph, DC .

PHYSICAL REVIEW LETTERS, 2001, 87 (22) :art. no.-226801

[6] Spin-transfer effects in nanoscale magnetic tunnel junctions [J].

Fuchs, GD ;

Emley, NC ;

Krivorotov, IN ;

Braganca, PM ;

Ryan, EM ;

Kiselev, SI ;

Sankey, JC ;

Ralph, DC ;

Buhrman, RA ;

Katine, JA .

APPLIED PHYSICS LETTERS, 2004, 85 (07) :1205-1207

[7]

Gardiner C. W., 1983, HDB STOCHASTIC METHO

[8] Tunneling via individual electronic states in ferromagnetic nanoparticles [J].

Guéron, S ;

Deshmukh, MM ;

Myers, EB ;

Ralph, DC .

PHYSICAL REVIEW LETTERS, 1999, 83 (20) :4148-4151

[9] Observation of spin-transfer switching in deep submicron-sized and low-resistance magnetic tunnel junctions [J].

Huai, YM ;

Albert, F ;

Nguyen, P ;

Pakala, M ;

Valet, T .

APPLIED PHYSICS LETTERS, 2004, 84 (16) :3118-3120

[10] Magnetization reversal induced by spin accumulation in ferromagnetic transition-metal dots [J].

Inoue, J ;

Brataas, A .

PHYSICAL REVIEW B, 2004, 70 (14) :140406-1

← 1 2 3 →