Spin Dynamics in Heusler Alloy Pd2MnSn

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  • Kubo Yasunori
    Department of Physics, Faculty of Science, Kagoshima University
  • Ishida Shoji
    Department of Physics, Faculty of Science, Kagoshima University
  • Ishida Junji
    Department of Physics, Faculty of Science, Kagoshima University

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  • Spin Dynamics in Heusler Alloy Pd<SUB>2</SUB>MnSn

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The dynamical spin susceptibility in the ferromagnetic Heusler alloy X2MnY (Pd2MnSn) is evaluated on the basis of the realistic band structure. The theoretical results of spin wave spectra of Pd2MnSn are in good agreement with the experimental ones, as have been for Cu2MnAl. The correlation between the spin densities of d-electrons of Mn is important to the spin waves with small and large q in both Cu2MnAl and Pd2MnSn. In Pd2MnSn the correlation between the spin density of d-electrons of Mn and that of conduction electrons is important for the spin waves with small and large q, but in Cu2MnAl this correlation decreases significantly for those with large q. These different q dependences of the spin-density correlation for Cu2MnAl and Pd2MnSn are consistent with the strong dependence on X atom of the magnetic interactions pointed out by Ishikawa et al.

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