Competition between dipolar and exchange interparticle interactions in magnetic nanoparticle films

被引：83

作者：

Kechrakos, D ^{[1
]}

Trohidou, KN ^{[1
]}

机构：

[1] NCSR Demokritos, Inst Mat Sci, GR-15310 Athens, Greece

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2003年 / 262卷 / 01期

关键词：

magnetic nanoparticles; hysteresis; blocking temperature; interparticle interactions; Monte Carlo simulation;

D O I：

10.1016/S0304-8853(03)00029-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The concentration dependence of the remanence, the coercivity and the blocking temperature of a three-dimensional random assembly of ferromagnetic nanoparticles interacting via exchange and dipolar forces is studied by Monte Carlo simulations. We find that interactions always suppress the coercivity, while they have opposite effects on the remanence of the sample. The crossover from dipolar-coupled to exchange-coupled behavior occurs when the two types of interactions have comparable strengths. The blocking temperature is always enhanced due to interactions, except for the case that particles coalesce and the sample is above the percolation threshold. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：107 / 110

页数：4

共 10 条

[1] Magnetic behavior of nanostructured films assembled from preformed Fe clusters embedded in Ag [J].

Binns, C ;

Maher, MJ ;

Pankhurst, QA ;

Kechrakos, D ;

Trohidou, KN .

PHYSICAL REVIEW B, 2002, 66 (18) :1-12

[2] Calculations of the susceptibility of interacting superparamagnetic particles [J].

Chantrell, RW ;

Walmsley, N ;

Gore, J ;

Maylin, M .

PHYSICAL REVIEW B, 2001, 63 (02)

[3]

Cullity B.D., 1972, Introduction to Magnetic Materials

[4]

Dormann JL, 1997, ADV CHEM PHYS, V98, P283, DOI 10.1002/9780470141571.ch4

[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]

Jensen PJ, 2002, PHYS STATUS SOLIDI A, V189, P527, DOI 10.1002/1521-396X(200202)189:2<527::AID-PSSA527>3.0.CO

[7]

2-C

[8] Magnetic properties of dipolar interacting single-domain particles [J].

Kechrakos, D ;

Trohidou, KN .

PHYSICAL REVIEW B, 1998, 58 (18) :12169-12177

[9]

POLITI P, ARXIVCONDMAT0208097

[10] Computational model of the magnetic and transport properties of interacting fine particles [J].

Verdes, C ;

Ruiz-Diaz, B ;

Thompson, SM ;

Chantrell, RW ;

Stancu, A .

PHYSICAL REVIEW B, 2002, 65 (17) :1744171-17441710

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