Dipolar interaction and magnetic ordering in granular metallic materials

被引：17

作者：

Altbir, D

Vargas, P

Castro, JDE

Raff, U

机构：

[1] Univ Santiago Chile, Dept Fis, Santiago 2, Chile

[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[3] Univ Fed Fluminense, Inst Fis, BR-24210340 Niteroi, RJ, Brazil

来源：

PHYSICAL REVIEW B | 1998年 / 57卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.57.13604

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The coupling between magnetic clusters in granular metals is investigated assuming a classical dipolar interaction to couple the clusters. It is shown that in general the dipolar interaction energy is well described by replacing the clusters by an effective magnetic moment located at the center of mass of the cluster. The magnetization and reduced magneto resistance of these systems are described as a function of an external magnetic field for a variety of cluster distributions. An experimental design that yields a system with high reduced magnetoresistance is suggested.

引用

页码：13604 / 13609

页数：6

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