Magnetic Properties of Tetragonally Distorted Fe_3Pt and the Hybrid Structure Fe_3Pt/Fe

Abstract

To investigate the magnetic performance of a hybrid structure oftransition metals, we consider the Fe₃Pt/Fe system and examine theeffects both of the tetragonal distortion of L1₂ type Fe₃Pt andthe hybridization with bcc-Fe on the magnetic properties, usingLMTO-ASA method in the framework of LSD. The magnetic moment ofFe₃Pthas a maximum stationary value of 8.85 μ _B/cell atc/a=1/√2. The hypothetical struc-ture of Fe₂₀Pt₄ is supposed by combining Fe₃Pt of c/a=1/√2 and bcc-Fe lattice. It is predicted that the magnetizationreaches 2.27 T with the magnetic anisotropy constant of 11×10⁵ J/m³. With using the coherent rotation model formagnetization reversal process, we get maximum energy product(BH)_max=10.2 MJ/m³.