Using the fully relativistic spin-polarized screened Korringa-Kohn-Rostoker method the magnetic properties of bulk NicFe1-c alloys, their free surfaces, and (free surfaces) of related spin valves of the type NicFe1-c/Co4Cu5Co4/ NicFe1-c are calculated. It is found that in the bulk systems the phase transition between transition between fcc and bcc can be described very well in terms of spin and orbital magnetic moments, but also in terms of the magnetic anisotropy energy. The free surfaces and the spin-valve systems differ considerably from the corresponding bulk systems: free surfaces show a reorientation transition from a perpendicular orientation of the magnetization to in-plane at about 60% Ni, whereas the overall in-plane magnetization found in permalloy related spin valves can be mainly related to the contributions of the Co slabs to the band energy part of the magnetic anisotropy energy. In all cases investigated the (spin and orbital) magnetic moments for the free surfaces are considerably enhanced at the surface with similar effects pertaining at the interfaces and the surface of the spin valves.
|Number of pages||7|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2001|
ASJC Scopus subject areas
- Condensed Matter Physics