Title :
Magnetoresistance in bulk Cu-Co based alloys
Author :
Wecker, J. ; ven Helmolt, R. ; Schultz, L. ; Samwer, K.
Author_Institution :
Siemens AG, Erlangen, Germany
fDate :
11/1/1993 12:00:00 AM
Abstract :
An enhanced magnetoresistance of up to 11% at room temperature is found in granular Cu1-xCox (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 Cu1-xCox; 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;
Journal_Title :
Magnetics, IEEE Transactions on
