Field dependence of orbital magnetic moments in the Heusler compounds Co2FeAl and Co2Cr0.6Fe0.4Al

Orbital and spin magnetic moments of the Heusler compounds Co2FeAl and Co2Cr0.6Fe0.4Al were measured by magnetic circular dichroism in X-ray absorption (XMCD). The orbital magnetic moments per spin are quite large (0.1--0.2) compared to bulk values of Fe and Co metals, indicating a considerable spin...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2004-08, Vol.79 (3), p.557-563
Main Authors: ELMERS, H. J, WURMEHL, S, FECHER, G. H, JAKOB, G, FELSER, C, SCHÖNHENSE, G
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dichroism
Errors
Exact sciences and technology
Iron
Joining
Localization
Magnetic moment
Metals. Metallurgy
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Orbitals
Other interactions of matter with particles and radiation
Physics
X-ray absorption and absorption edges
X-rays
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Summary:Orbital and spin magnetic moments of the Heusler compounds Co2FeAl and Co2Cr0.6Fe0.4Al were measured by magnetic circular dichroism in X-ray absorption (XMCD). The orbital magnetic moments per spin are quite large (0.1--0.2) compared to bulk values of Fe and Co metals, indicating a considerable spin--orbit coupling in these Heusler compounds. A strong localization of the 3d electron states might be responsible for this observation. The Co and Fe orbital to spin moment ratio shows a distinct decrease of {/content/UMMBVT61W0J7NFEM/xxlarge916.gif}r(Fe)=0.04c0.02 and {/content/UMMBVT61W0J7NFEM/xxlarge916.gif}r(Co)=0.06c0.02 with increasing external field for the ternary compound Co2FeAl, while the ratio is within error limits independent of the field for Co2Cr0.6Fe0.4Al. This is discussed in terms of a relation to magnetocrystalline anisotropies.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-003-2366-3