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I. Turek, S. Blügel, G. Bihlmayer, P. Weinberger:
"Exchange interactions at surfaces of Fe, Co, and Gd ";
Czechoslovak Journal of Physics, 53 (2003), 81 - 88.

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-energydi .erences 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 sensitivityof exchange interactions at a Gd(0001) surface to relaxation of interlayer
distances. The calculated results do not provide support for recentlyo bserved surface
enhancement of the Curie temperature of the Gd metal.
PACS: 75.70.Rf
Key words: surface magnetism, exchange interactions, Curie temperature

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04405690

http://www.cms.tuwien.ac.at/publications/pdf2003/cjp53-81-03.pdf