Large training effects in magnetic relaxation and anisotropic magnetoresistance in nanocrystalline exchange-biased Ni80Fe20/Co-O bilayers -: art. no. 052402

被引：25

作者：

Pina, E ^{[1
]}

Prados, C ^{[1
]}

Hernando, A ^{[1
]}

机构：

[1] CSIC, UCM, RENFE, Inst Magnetismo Aplicado, Madrid, Spain

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.69.052402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetization curves, magnetic kinetics, and anisotropic magnetoresistance of nanocrystalline Ni80Fe20/CoO bilayers have been studied after field cooling through the blocking temperature of the antiferromagnetic oxide. Exponential decay together with low magnetoresistance ratio is found to govern the first magnetization reversal after field cooling. Second and consecutive reversals present typical logarithm behavior of a constant distribution of activation energies together with high values of the magnetoresistance ratio. These results are attributed to large training effects that, decreasing the number of noncompensated sites, induce a transition in the reversal magnetization processes from a single wall motion process to multiple rotations.

引用

页数：4

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