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

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Abstract

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 Δr(Fe)=0.04±0.02 and Δr(Co)=0.06±0.02 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.

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Authors and Affiliations

  1. Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55099, Mainz, Germany

    H.J. Elmers, G.H. Fecher, G. Jakob & G. Schönhense

  2. Institut für Anorganische und Analytische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10–14, 55099, Mainz, Germany

    S. Wurmehl & C. Felser

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  1. H.J. Elmers
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  2. S. Wurmehl
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  3. G.H. Fecher
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  4. G. Jakob
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  6. G. Schönhense
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Correspondence to H.J. Elmers.

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75.50.Cc; 71.20.Lp; 78.40.Kc

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Elmers, H., Wurmehl, S., Fecher, G. et al. Field dependence of orbital magnetic moments in the Heusler compounds Co2FeAl and Co2Cr0.6Fe0.4Al. Appl. Phys. A 79, 557–563 (2004). https://doi.org/10.1007/s00339-003-2366-3

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  • DOI: https://doi.org/10.1007/s00339-003-2366-3

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