Appl. Phys. A 51, 255-263 (1990)
Magnetic Anisotropies in Fe(110) films on W(110)
H. J. Elmers and U. gradmann

Magnetic anisotropies in epitaxial Fe(100) films on W(110) were analyzed 
using torsion magnetometry (TOM) in situ in UHV. Films with clean surfaces 
and films coated by Cu, Ag, and Au were analyzed. Out-of-plane 
anisotropies were determined by standard TOM methods, in-plane 
anisotropies from hard-axis magnetization loops. Since all anisotropies 
showed a clear linear dependence on reciprocal film-thickness, a 
straightforward separation of volume and surface type anisotropy could be 
performed. Volume anisotropies can be explained as a superposition of 
standard fourth-order magnetocrystalline and strain anisotropies, caused 
by residual strain of the Fe coincidence lattice on W. Surface 
anisotropies, both in-plane and out-of-plane, are related by Neel's model 
to the bulk magnetoelastic constants, to a surprisingly good 
approximation.