Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 26: Magnetic Thin Films I of 2

MA 26.9: Vortrag

Mittwoch, 13. März 2013, 11:45–12:00, H3

Influence of spin disorder on the relation between magnetic anisotropy and orbital magnetism. — •Leonid Sandratskii — Max-Planck-Institut für Mikrostrukturphysik Weinberg 2, D-06120 Halle, Germany

The close relation between the magnetic anisotropy and the anisotropy of the orbital moments is widely accepted. On the other hand, the question, how the temperature-induced spin-disorder influence the relation between magnetic anisotropy and orbital magnetism remains unknown. Using first-principles approach that takes into account both spin disordering and spin-orbit coupling we obtain principally different behavior of orbital magnetism and magnetic anisotropy for different films. While the magnetic anisotropy of the Co film tends to decrease with spin disordering, in the Fe film an opposite trend to an increase of the magnetic anisotropy is obtained. In FePt film we obtain complex interplay of the orbital and spin magnetism leading to the orthogonality of the spin and orbital moments of the Fe atoms at certain level of spin disorder. We explain the variety of behavior by different response of the electronic structure to the spin disordering and relate it to the variety of the experimentally detected temperature dependences of the magnetic anisotropy in thin films.