Asymmetric impedance in field-annealed Co-based amorphous wires and its bias field dependence

被引：8
|
作者：
Duque, JGS [1 ]
De Araújo, AEP [1 ]
Knobel, A [1 ]
机构：
[1] Univ Estadual Campinas, UNICAMP, IFGW, BR-13083970 Campinas, SP, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2006年 / 299卷 / 02期
基金：
巴西圣保罗研究基金会;
关键词：
asymmetric magnetoimpedance; Joule heating; bias field;
D O I：
10.1016/j.jmmm.2005.05.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Giant magnetoimpedance (GMI) was measured in Joule heated Co68.18Fe4.32Si12.5B15 amorphous wires. Samples heat treated in open air showed an asymmetric giant magnetoimpedance (AGMI) behaviour. The AGM I profile, measured at selected frequency values and bias circumferential fields, can be related to the exchange bias interaction between the soft magnetic amorphous material and a harder magnetic crystalline phase formed on the surface of the wire. The present data show that AGMI behaviour take place owing to a soft magnetic layer With unidirectional anisotropy that develops in the surface of the wire. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：419 / 424
页数：6
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