Magnetoresistance in bulk Cu-Co based alloys

Author

Wecker, J. ; ven Helmolt, R. ; Schultz, L. ; Samwer, K.

Author_Institution

Siemens AG, Erlangen, Germany

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

3087

Lastpage

3089

Abstract

An enhanced magnetoresistance of up to 11% at room temperature is found in granular Cu_1-xCo_x (0.1⩽x⩽0.5) alloys, which are prepared by melt-spinning and a subsequent annealing treatment. The rapid solidification extends the solubility of Co in Cu, i.e., the as-quenched state consists of a supersaturated Cu matrix with some quenched-in Co-precipitates. During subsequent heat treatment, the size and the density of the precipitates can be varied. Since the precipitates behave superparamagnetically at room temperature, the average particle sizes and the amount of precipitated Co can be estimated from magnetization curves

Keywords

annealing; cobalt alloys; copper alloys; ferromagnetic properties of substances; magnetic properties of fine particles; magnetisation; melt spinning; precipitation; rapid solidification; superparamagnetism; annealing treatment; as-quenched state; average particle sizes; bulk Cu-Co based alloys; density; granular Cu_1-xCo_x; heat treatment; magnetization curves; magnetoresistance; melt-spinning; quenched-in Co-precipitates; rapid solidification; size; solubility; superparamagnetically; supersaturated Cu matrix; Annealing; Copper; Enhanced magnetoresistance; Heat treatment; Magnetic field measurement; Magnetic fields; Magnetic materials; Magnetic separation; Magnetization; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.280891

Filename

280891