MAGNETIC CIRCULAR DICHROISM IN THE SOFT X-RAY ABSORPTION SPECTRA OF Co-BASED HEUSLER ALLOYS

A. Yamasaki, S. Imada, S. Suga, T. Kanomata and S. Ishida
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A. Yamasaki: Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560-8531, Japan
S. Imada: Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560-8531, Japan
S. Suga: Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560-8531, Japan
T. Kanomata: Faculty of Engineering, Tohoku Gakuin University, Tagajo, Miyagi 985-8537, Japan
S. Ishida: Faculty of Science, Kagoshima University, Kagoshima 890-0065, Japan

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 955-960

Abstract: Magnetic circular dichroism (MCD) of core-level absorption spectra (XAS) in the soft X-ray region has been measured for the ferromagnetic Heusler alloysCo2TiSn,Co2ZrSn, andCo2NbSn. The Co2p → 3dXAS–MCD spectra show an obvious contribution of the orbital angular momentum component to the magnetic moment in these alloys. The ratio between the orbital and the spin magnetic moments derived from the MCD spectra varies by more than a factor of 2 within these alloys. The mechanism of this variation is discussed in comparison with the band structure calculation.

Date: 2002
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DOI: 10.1142/S0218625X02003275

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