Effect of the surface anisotropy and the shape on the magnetization behavior in an egg-shaped nanoparticle

被引：5

作者：

Du, An ^{[1
]}

Xu, Yuanyuan ^{[1
]}

机构：

[1] Northeastern Univ, Coll Sci, Shenyang 110004, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 21期

关键词：

ferromagnetic nanoparticle; surface anisotropy; Monte Carlo simulation; exchange bias;

D O I：

10.1016/j.jmmm.2008.03.057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using the classical Heisenberg model and Monte Carlo simulation, we compute the magnetization behavior of a ferromagnetic nanoparticle with an egg-shape in an external magnetic field along the symmetry axis. The particle is in a single-domain state with a surface anisotropy axis perpendicular to the surface of the particle. At low temperature, it is found that exchange bias appears in the hysteresis loop, which does not exist in the spherical and ellipsoidal nanoparticles. The bias field produced by the frozen spins on the surface of the egg-shaped nanoparticle may be the reason to produce the phenomenon of the exchange bias. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：2567 / 2570

页数：4

共 22 条

[1] Surface anisotropy and surface-core interaction in Co-Ni-B and Fe-Ni-B dispersed amorphous nanoparticles [J].

De Biasi, E ;

Zysler, RD ;

Ramos, CA ;

Romero, H ;

Fiorani, D .

PHYSICAL REVIEW B, 2005, 71 (10)

[2] Metropolis algorithm for simulating hysteresis in ferromagnetic nanoparticles [J].

De Biasi, E ;

Ramos, CA ;

Zysler, RD ;

Fiorani, D .

PHYSICA B-CONDENSED MATTER, 2006, 372 (1-2) :345-349

[3] Large surface magnetic contribution in amorphous ferromagnetic nanoparticles [J].

De Biasi, E ;

Ramos, CA ;

Zysler, RD ;

Romero, H .

PHYSICAL REVIEW B, 2002, 65 (14) :1-8

[4] SPIN RELAXATION IN SMALL FREE IRON CLUSTERS [J].

DEHEER, WA ;

MILANI, P ;

CHATELAIN, A .

PHYSICAL REVIEW LETTERS, 1990, 65 (04) :488-491

[5] The hysteresis curves of nanoparticles obtained by Monte Carlo method based on the Stoner-Wohlfarth model [J].

Du, H. F. ;

Du, A. .

JOURNAL OF APPLIED PHYSICS, 2006, 99 (10)

[6] Effect of exchange and dipolar interactions on the hysteresis of magnetic nanoparticle systems [J].

Du, H. F. ;

Du, A. .

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 2007, 244 (04) :1401-1408

[7] Numerical study of the exchange bias effects in magnetic nanoparticles with core/shell morphology [J].

Eftaxias, E ;

Trohidou, KN .

PHYSICAL REVIEW B, 2005, 71 (13)

[8]

[9] Monte Carlo simulation study of exchange biased hysteresis loops in nanoparticles [J].

Iglesias, O ;

Labarta, A .

PHYSICA B-CONDENSED MATTER, 2006, 372 (1-2) :247-250

[10] Microscopic origin of exchange bias in core/shell nanoparticles [J].

Iglesias, O ;

Batlle, X ;

Labarta, A .

PHYSICAL REVIEW B, 2005, 72 (21)

← 1 2 3 →