Magnetic properties of FePt1−xIrx alloys and applications of the thin films

Abstract In the pseudobinary FePt1−xIrx (0⩽x⩽0.6) alloys with CuAuI-type structure, Ir substitution destroys ferromagnetism of FePt rapidly and the alloys become antiferromagnetic for x>0.35. The alloy films of FePt1−xIrx made from FePt/FeIr bilayer films on fused silica substrates by diffusion grow preferably with a characteristic direction of 0 0 1 . The film of FePt deposited onto the FePt1−xIrx film have a characteristic of magnetic perpendicularity and high coercivity.