Dresden 2006 – wissenschaftliches Programm
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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)