Effects of magnetic interparticle coupling in the blocking temperature of granular Co multilayers

被引：11

作者：

Denardin, J. C. ^{[1
]}

Nunes, W. C.

Knobel, M.

机构：

[1] Univ Santiago Chile, Dept Fis, USACH, Santiago, Chile

[2] Univ Estadual Campinas, Dept Fis Mat Condensada, Inst Fis Gleb Wataghin, Campinas, SP, Brazil

来源：

PHYSICA B-CONDENSED MATTER | 2006年 / 384卷 / 1-2期

基金：

巴西圣保罗研究基金会;

关键词：

magnetic nanoparticles; dipolar interactions;

D O I：

10.1016/j.physb.2006.06.013

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In order to study the influence of magnetic interactions on the blocking temperature of magnetic nanoparticles, magnetization measurements were carried out on a discontinuous CO/SiO2 multilayer. The observed field dependence of the blocking temperature does not fit any of the non-interacting laws commonly used to describe this behavior. We applied a generalized model which considers a field-dependent magnetic correlation length. This model explains well the experimental results and can be used in other nanoparticulate systems. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：290 / 293

页数：4

共 19 条

[1] RANDOM ANISOTROPY IN AMORPHOUS FERROMAGNETS [J].

ALBEN, R ;

BECKER, JJ ;

CHI, MC .

JOURNAL OF APPLIED PHYSICS, 1978, 49 (03) :1653-1658

[2] Ordering effects of the dipolar interaction in lattices of small magnetic particles [J].

Bahiana, M ;

Nunes, JPP ;

Altbir, D ;

Vargas, P ;

Knobel, M .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2004, 281 (2-3) :372-377

[3] MAGNETIC AND TRANSPORT-PROPERTIES OF GRANULAR COBALT FILMS [J].

BARZILAI, S ;

GOLDSTEIN, Y ;

BALBERG, I ;

HELMAN, JS .

PHYSICAL REVIEW B, 1981, 23 (04) :1809-1817

[4] Structural, magnetic and transport properties of discontinuous granular multi-layers [J].

Denardin, JC ;

Knobel, M ;

Dorneles, LS ;

Schelp, LF .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2005, 294 (02) :206-212

[5] The nature of magnetic interactions in CoFe-Ag(Cu) granular thin films [J].

Franco, V ;

Batlle, X ;

Labarta, A ;

O'Grady, K .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2000, 33 (06) :609-613

[6] Comment on "Magnetic relaxation of interacting co clusters: Crossover from two- to three-dimensional lattices" [J].

Hansen, MF ;

Morup, S .

PHYSICAL REVIEW LETTERS, 2003, 90 (05)

[7] Thermal dependence of coercivity in soft magnetic nanocrystals [J].

Hernando, A ;

Marin, P ;

Vazquez, M ;

Barandiaran, JM ;

Herzer, G .

PHYSICAL REVIEW B, 1998, 58 (01) :366-370

[8] Magnetic versus structural properties of Co nanocluster thin films: A magnetic force microscopy study [J].

Koch, SA ;

Velde, RHT ;

Palasantzas, G ;

De Hosson, JTM .

APPLIED PHYSICS LETTERS, 2004, 84 (04) :556-558

[9] Magnetic correlations in nanostructured ferromagnets [J].

Löffler, JF ;

Braun, HB ;

Wagner, W .

PHYSICAL REVIEW LETTERS, 2000, 85 (09) :1990-1993

[10]

LUIS F, 2002, PHYS REV LETT, V88, P21725

← 1 2 →