Influence of interfacial roughness on exchange bias in core-shell nanoparticles

被引：61

作者：

Evans, R. F. L. ^{[1
]}

Bate, D. ^{[1
]}

Chantrell, R. W. ^{[1
]}

Yanes, R. ^{[2
]}

Chubykalo-Fesenko, O. ^{[2
]}

机构：

[1] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[2] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 09期

关键词：

MAGNETIC NANOSTRUCTURES; SUPERPARAMAGNETIC LIMIT; THERMAL FLUCTUATIONS; ANISOTROPY; FILMS;

D O I：

10.1103/PhysRevB.84.092404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Exchange bias is a phenomenon that has attracted a great deal of interest in the 50 years following its discovery, but that is still lacking a deep theoretical understanding of its origin in core-shell nanoparticles. We present calculations of ferro-antiferromagnetic core-shell nanoparticles with roughened interfaces and demonstrate a wide dispersion in the calculated exchange-bias field caused by the roughening. Furthermore, we show that the magnitude of the exchange-bias field is strongly correlated with the net interfacial moment in the antiferromagnet, proportional to the degree of the interfacial roughness. This provides new insight into the origins of exchange bias in core-shell nanoparticles.

引用

页数：4

共 20 条

[1] THERMAL FLUCTUATIONS OF A SINGLE-DOMAIN PARTICLE [J].

BROWN, WF .

PHYSICAL REVIEW, 1963, 130 (05) :1677-+

[2] 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)

[3] Magnetic nanostructures - Overcoming thermal fluctuations [J].

Eisenmenger, J ;

Schuller, IK .

NATURE MATERIALS, 2003, 2 (07) :437-438

[4] On beating the superparamagnetic limit with exchange bias [J].

Evans, R. F. L. ;

Yanes, R. ;

Mryasov, O. ;

Chantrell, R. W. ;

Chubykalo-Fesenko, O. .

EPL, 2009, 88 (05)

[5] Self-consistent Gaussian approximation for classical spin systems: Thermodynamics [J].

Garanin, DA .

PHYSICAL REVIEW B, 1996, 53 (17) :11593-11605

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

Iglesias, O ;

Batlle, X ;

Labarta, A .

PHYSICAL REVIEW B, 2005, 72 (21)

[7] Role of surface disorder on the magnetic properties and hysteresis of nanoparticles [J].

Iglesias, O ;

Labarta, A .

PHYSICA B-CONDENSED MATTER, 2004, 343 (1-4) :286-292

[8] Magnetic anisotropy of a single cobalt nanocluster [J].

Jamet, M ;

Wernsdorfer, W ;

Thirion, C ;

Mailly, D ;

Dupuis, V ;

Mélinon, P ;

Pérez, A .

PHYSICAL REVIEW LETTERS, 2001, 86 (20) :4676-4679

[9] Exchange bias theory [J].

Kiwi, M .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2001, 234 (03) :584-595

[10] Controlling exchange bias in Co-CoOx nanoparticles by oxygen content [J].

Kovylina, Miroslavna ;

Garcia del Muro, Montserrat ;

Konstantinovic, Zorica ;

Varela, Manuel ;

Iglesias, Oscar ;

Labarta, Amilcar ;

Batlle, Xavier .

NANOTECHNOLOGY, 2009, 20 (17)

← 1 2 →