A phenomenological theory of giant magnetoresistance in magnetic granular alloys

被引：1
|
作者：
Yang, WW [1 ]
Sun, H [1 ]
Zhu, XY [1 ]
Song, WJ [1 ]
机构：
[1] Suzhou Univ, Dept Phys, Suzhou 215006, Peoples R China
来源：
PHYSICA B | 2001年 / 299卷 / 1-2期
关键词：
giant magnetoresistance; spin-dependent scattering; superparamagnetism; ferromagnetism; inhomogeneous granular films;
D O I：
10.1016/S0921-4526(00)00594-9
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We combine effective medium theory (EMT) with the two-channel conducting model to study the magnetic granular concentration dependence of a giant magnetoresistance (GMR) in magnetic granular composites. The composite is composed of small magnetic granules (such as Co) embedded in an immiscible nonmagnetic metallic matrix (such as Ag). We consider the influence of granule size and concentration, respectively. Firstly, granules have a distribution in size, resulting in superparamagnetic (SPM) granules and ferromagnetic granules which have different contributions to conductance. Secondly, the effective surface scattering is changed with the changes of concentration. The calculated result of GMR is in agreement with the experimental data. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：77 / 82
页数：6
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