Low-temperature properties of thin iron films prepared by DC magnetron sput
tering on single-crystal GaAs (001) substrates have been investigated by me
ans of FMR measurements. It was found in the presence of both the fourfold
and twofold anisotropy. Both of them depend strongly on the thickness of th
e film. It means that the surface anisotropy determines not only the value
of the twofold anisotropy but also the fourfold one. (C) 2000 Elsevier Scie
nce B.V. All rights reserved.