Abstract
Studies to determine the effects of alternating layers of positive-magnetostriction a-CoTi and negative-magnetostriction a-CoNb, to investigate the consequences for the film magnetic properties, and to elucidate the Nb-Ti interdiffusion mechanism, are described. Co 80 Ti 20 /Co 80 Nb 20 and Co 80 Ti 20 /Co 70 Si 15 B 15 films, compositionally modulated with wavelengths of 30 to 60 A, were prepared by sputtering. The CoTi/CoNb coercivity was found to be increased compared with CoNb, CoTi, and CoNbTi films. The compositionally modulated structure changes to a simple periodic structure through low-temperature heat treatment, but this transition is apparently reversible at higher temperatures through some anomalous diffusion mechanism.
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