Zero-field relaxation and exchange interactions in magnetic thin films

被引：9

作者：

Khapikov, AF ^{[1
]}

Wang, S ^{[1
]}

Xu, B ^{[1
]}

Harrell, JW ^{[1
]}

机构：

[1] Univ Alabama, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.63.020401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A zero-field relaxation phenomenon has been observed and studied in a series of CoPtCrB thin-film samples with progressively decreasing grain size. In particular, a nonmonotonic time dependence of the magnetization has been measured in zero external magnetic field after partial de demagnetization of the samples. The zero-field relaxation rate becomes increasingly strong as grain sizes approach the superparamagnetic limit. The phenomenon is ascribed to a cooperative influence of intergranular interactions and thermal effects and is described using an extended Preisach-type model that includes thermal relaxation effects.

引用

页数：4

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