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

Giant magnetoimpedance (GMI) was measured in Joule heated Co 68.18Fe 4.32Si 12.5B 15 amorphous wires. Samples heat treated in open air showed an asymmetric giant magnetoimpedance (AGMI) behaviour. The AGMI profile, measured at selected frequency values and bias circumferential fields, can be related...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2006-04, Vol.299 (2), p.419-424
Main Authors: Duque, J.G.S., De Araújo, A.E.P., Knobel, M.
Format: Article
Language:English
Subjects:
Asymmetric magnetoimpedance
Bias field
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Giant magnetoresistance
Joule heating
Magnetic properties and materials
Magnetotransport phenomena, materials for magnetotransport
Physics
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Summary:Giant magnetoimpedance (GMI) was measured in Joule heated Co 68.18Fe 4.32Si 12.5B 15 amorphous wires. Samples heat treated in open air showed an asymmetric giant magnetoimpedance (AGMI) behaviour. The AGMI 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.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2005.05.001