Title :
First principles calculations of the electronic structure of Fe1-xCoxPt
Author :
Maclaren, J.M. ; Willoughby, S.D. ; McHenry, M.E. ; Ramalingam, B. ; Sankar, S.G.
Author_Institution :
Dept. of Phys., Tulane Univ., New Orleans, LA, USA
fDate :
7/1/2001 12:00:00 AM
Abstract :
The L10 alloys CoPt and FePt have strong uniaxial magneto-crystalline anisotropy as a consequence of the layering of Co or Fe and Pt planes. This makes these compounds of interest in permanent magnet applications. In this work we present the results of a study of the magnetic properties of the L10 alloys Fe1-xCo xPt for the range of compositions from FePt to CoPt. Local spin density calculations using the coherent potential approximation are used to follow trends in the magneto-crystalline anisotropy and magnetic moments across the composition range. Total energy calculations of ordered and disordered alloys are used to develop a pseudo-binary phase diagram of the Fe/Co layer predicting regions of phase separation in this layer at temperatures below 650°C
Keywords :
CPA calculations; cobalt alloys; electronic density of states; ferromagnetic materials; iron alloys; magnetic anisotropy; magnetic moments; phase diagrams; phase separation; platinum alloys; total energy; Fe-Co-Pt; Fe1-xCoxPt; L10 alloys; coherent potential approximation; disordered alloys; electronic structure; first principles calculations; local spin density calculations; magnetic moments; magnetic properties; ordered alloys; permanent magnet applications; phase separation regions; plane layering; pseudo-binary phase diagram; total energy calculations; uniaxial magneto-crystalline anisotropy; Anisotropic magnetoresistance; Cobalt alloys; Iron alloys; Magnetic anisotropy; Magnetic moments; Magnetic properties; Magnetic separation; Permanent magnets; Perpendicular magnetic anisotropy; Platinum alloys;
Journal_Title :
Magnetics, IEEE Transactions on
