Abstract
Seeking new materials for high-density magnetic recording media, we investigated the magnetic anisotropy and phase separation of Co-Mo and Co-W binary alloy thin films. Both alloys exhibit much larger magnetic anisotropy than does Co-Cr. Thermodynamic calculations on phase equilibria of Co-X (X = Cr, Mo, W) binary systems predict that magnetically induced two-phase separation can occur in these binary alloys as has been experimentally observed in Co-Cr. In fact, their saturation magnetization and Curie temperature are obviously enhanced by annealing or depositing them at high temperatures, suggesting the promotion of two- (ferro/para) phase separation. Microscopic compositional modulation due to the phase separation was confirmed in a Co-Mo film by micro EDX analysis. However, the amplitude of the compositional modulation is much weaker than the thermodynamic calculations, indicating that the miscibility gap is considerably narrowed probably due to large misfit energy at the ferro/para interface or due to very limited diffusion constants of Mo and W.
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