Role of interparticle coupling on the tunneling magnetoresistance of granular films in interacting superparamagnetic system

被引：2
|
作者：
Mao, Zhongquan [1 ]
Chen, Dihu [1 ]
He, Zhenhui [1 ]
机构：
[1] Sun Yet Sen Univ, Sch Phys & Engn, Dept Phys, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 05期
基金：
中国国家自然科学基金;
关键词：
tunneling magnetoresistance; interaction; superparamagnetism; magnetization; correlation length;
D O I：
10.1016/j.jmmm.2007.07.028
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A phenomenological model is employed to explain the departure of H/T scaling of tunneling magnetoresistance (TMR) in Co-0.43(ZrO2)(0.57) granular films (see [B.J. Hattink, M. Garcia del Muro, Z. Konstantinovic, X. Batlle, A. Labarta, Phys. Rev. B 73 (2006) 045418]). The model bases on the modi. cation of Langevin function by taking into account the field-dependent correlation length, in the framework of Inoue-Maekawa model. Both TMR-H and TMR-H/T curves can be reproduced very well by this model, indicating that the interparticle coupling plays an important role on TMR in the interacting superparamagnetic systems. The influence of anisotropy and spin polarization of the magnetic particles on TMR-H/T curves is also discussed. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：642 / 645
页数：4
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