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Exchange Interactions at Surfaces of Fe, Co, and Gd

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Czechoslovak Journal of Physics Aims and scope

Abstract

Magnetic exchange interactions at low-index surfaces of bcc iron, hcp cobalt, and hcp gadolinium are studied using ab initio electronic structure calculations. Interlayer exchange couplings derived from total-energy differences are enhanced at the surfaces over their bulk counterparts. This trend is in contrast to a surface reduction of on-site exchange parameters formulated within a classical Heisenberg model. A particular attention is paid to the sensitivity of exchange interactions at a Gd(0001) surface to relaxation of interlayer distances. The calculated results do not provide support for recently observed surface enhancement of the Curie temperature of the Gd metal.

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Authors and Affiliations

  1. Acad. Sci. CR, Žižkova 22, Institute of Physics of Materials, CZ-61662, Brno, Czech Republic

    I. Turek

  2. Center for Computational Materials Science, Technical University of Vienna, Getreidemarkt 9/158, A-1060, Vienna, Austria

    P. Weinberger

Authors
  1. I. Turek
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  2. S. Blügel
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  3. G. Bihlmayer
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  4. P. Weinberger
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Turek, I., Blügel, S., Bihlmayer, G. et al. Exchange Interactions at Surfaces of Fe, Co, and Gd. Czechoslovak Journal of Physics 53, 81–88 (2003). https://doi.org/10.1023/A:1022363806047

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