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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.131: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Theoretical study of the influence of atomic disorder at the surfaces of magnetic Heusler alloys. — •Andrey Beznogov, Heike C. Herper, and Peter Entel — University of Duisburg-Essen, Campus Duiburg, Lotharstr. 1, 47048 Duisburg, Germany

We present first-principles calculation of atomic disorder effects at the surfaces of ferromagnetic Heusler alloys. Of particular interest are antisite defect structures at Co₂MnGa surfaces which are believed to be responsible for the reduction of the surface magnetic moments[1].

We compare results of calculations for Ni₂MnGa, which is of interest for magnetic shape memory technology, with corresponding results for Co₂MnGa, which is of interest for spintronic devices. The influence of disorder in half-metallic Heusler alloys was so far calculated for NiMnSb[2].

[1] J. Grabis, A. Bergmann, A. Nefedov, K. Westerholt, and H. Zabel, Phys. Rev. B 72, 024438 (2005)

[2] D. Orgassa, H. Fujiwara, T.C. Schulthess, and H.W. Butler, Phys. Rev. B 60, 13237 (1999)