TY - JOUR
T1 - Magnetic dichroism study on Mn1.8Co1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy
AU - Ouardi, Siham
AU - Fecher, Gerhard H.
AU - Kubota, Takahide
AU - Mizukami, Shigemi
AU - Ikenaga, Eiji
AU - Nakamura, Tetsuya
AU - Felser, Claudia
N1 - Publisher Copyright:
© 2015 IOP Publishing Ltd.
PY - 2015/4/29
Y1 - 2015/4/29
N2 - Using circularly polarised radiation and a combination of bulk-sensitive hard x-ray photoelectron spectroscopy and x-ray-absorption spectroscopy (XAS) we studied the electronic and magnetic structure of epitaxial Mn1.8Co1.2Ga thin films. Spin-resolved Bloch spectral functions, density of states as well as charge and magnetisation densities were investigated by a first-principles analysis of full potential, fully relativistic Korringa-Kohn-Rostoker calculations of the electronic structure. The valence states were experimentally investigated by using linear dichroism in the angular distribution and comparing the results to spin-resolved densities of states. The linear dichroism in the valence band enabled a symmetry analysis of the contributing states. The spectra were in good agreement with the theoretical partial density of states. The element-specific, spin-resolved, unoccupied densities of states for Co and Mn were analysed by using XAS and x-ray magnetic circular dichroism (XMCD) at the L3,2 edges. The spectra were influenced by strong correlation effects. XMCD was used to extract the site-resolved magnetic moments. The experimental values of mMn = 0.7 μB and mCo = 1.05 μB agree very well with the calculated magnetic moments. Magnetic circular dichroism in angle-resolved photoelectron spectroscopy at the Mn and Co 2p core level exhibited a pronounced magnetic dichroism and confirmed the localised character of the Mn d valence states.
AB - Using circularly polarised radiation and a combination of bulk-sensitive hard x-ray photoelectron spectroscopy and x-ray-absorption spectroscopy (XAS) we studied the electronic and magnetic structure of epitaxial Mn1.8Co1.2Ga thin films. Spin-resolved Bloch spectral functions, density of states as well as charge and magnetisation densities were investigated by a first-principles analysis of full potential, fully relativistic Korringa-Kohn-Rostoker calculations of the electronic structure. The valence states were experimentally investigated by using linear dichroism in the angular distribution and comparing the results to spin-resolved densities of states. The linear dichroism in the valence band enabled a symmetry analysis of the contributing states. The spectra were in good agreement with the theoretical partial density of states. The element-specific, spin-resolved, unoccupied densities of states for Co and Mn were analysed by using XAS and x-ray magnetic circular dichroism (XMCD) at the L3,2 edges. The spectra were influenced by strong correlation effects. XMCD was used to extract the site-resolved magnetic moments. The experimental values of mMn = 0.7 μB and mCo = 1.05 μB agree very well with the calculated magnetic moments. Magnetic circular dichroism in angle-resolved photoelectron spectroscopy at the Mn and Co 2p core level exhibited a pronounced magnetic dichroism and confirmed the localised character of the Mn d valence states.
KW - electronic structure
KW - Heusler thin films
KW - localised magnetic moment
KW - magnetic circular dichroism
KW - photoelectron spectroscopy
KW - x-ray absorption spectroscopy
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U2 - 10.1088/0022-3727/48/16/164007
DO - 10.1088/0022-3727/48/16/164007
M3 - Article
AN - SCOPUS:84928920071
SN - 0022-3727
VL - 48
JO - Journal Physics D: Applied Physics
JF - Journal Physics D: Applied Physics
IS - 16
M1 - 164007
ER -