Correlation effects among nanometre-sized clusters in Cu-Co melt-spun alloys with giant magnetoresistance

被引：5

作者：

Allia, P ^{[1
]}

Tiberto, P ^{[1
]}

Vinai, F ^{[1
]}

机构：

[1] Politecn Torino, IST NAZL FIS MAT, I-10129 TURIN, ITALY

来源：

PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES | 1997年 / 76卷 / 04期

关键词：

D O I：

10.1080/01418639708241109

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic correlation effects in nearly superparamagnetic granular Cu100-xCox systems exhibiting giant magnetoresistance (GMR) are studied by analysing the flat-top parabolae obtained when the GMR is plotted as a function of reduced magnetization. The nature of GMR in granular metallic systems is discussed in detail, taking into account the typical time constants involved in the short-time dynamics of magnetic moments in a local magnetic field. An outline of a theory providing the first quantitative explanation of the effect of magnetic correlation on GMR is given. The role of Co content in the sizes and distances of Co particles and in their degree of magnetic correlation are discussed, examining, for studied composition each, the samples characterized by the best GMR values.

引用

页码：447 / 455

页数：9

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