Research Papers in Physics and Astronomy


Date of this Version

March 1994


Copyright 1994 1EEE. Published by IEEETRANSACTIONS ON MAGNETICS, VOL. 30, NO. 2, MARCH 1994.Permission to use.


Fine cobalt and silver powders have been ball-milled to yield a granular solid of composition Co30Ag70 in the form of coarse powder. The material is an intimate mixture of grains of fcc CO in a silver matrix. The cobalt is in the single-domain size range, and the samples exhibit coercivity (0.07 T at 296 K) and unusual thermomagnetic effects, including field-induced unidirectional anisotropy. There is a large, isotropic negative magnetoresistance, which exceeds 10 95 at 4.2 K.

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