First Principles Magnetic Properties of Disordered Fe_xPt_(1-x) Alloys

摘要

The electronic structure and magnetic properties of Fe_xPt_(1-x) disordered alloys have been studied by means of the tight-binding linear muffin-tin orbital method in the atomic sphere approximation and in conjunction with the coherent potential approximation. The iron magnetic moment depends linearly on composition. As the pressure increases there are phase transitions from magnetic to nonmagnetic states. The volume magnetostriction is evaluated within disordered local moment formalism. A good agreement with the experimental results is obtained in the Invar composition range. The volume magnetostriction rapidly decreases with increasing Pt content.