PROGRES ET PERSPECTIVES
J. Phys. IV France 02 (1992) C3-239-C3-244
Magnetic anisotropy in iron thin films evaporated under ultra-high vacuumJ.F. DINHUT1, J.P. EYMERY1 and R. KRISHNAN2
1 Laboratoire de Métallurgie Physique, 40 avenue du Recteur Pineau, 86022 Poitiers cedex, France
2 Laboratoire de Magnétisme et Matériaux Magnétiques, 1 place Aristide Briand, 92195 Meudon cedex, France
α-iron thin films with thickness ranging between 20 and 1500 nm have been evaporated using an electron gun under ultra-high vacuum conditions ( 5.10-7 Pa). The columnar structure observed in cross-sectional TEM is related to the large surface diffusion. From Mössbauer spectra the spin orientation is deduced and found to be influenced by the column axis. Spins can be obtained perpendicularly to the film plane by rotating the substrate during the deposition. The magnetization of the samples is reduced by about 30 % and the reduction attributed to the interstitial space which increases with the incident angle. The substrate rotation also decreases Ku(//) by a factor 2 and increases Ku(⊥).
© EDP Sciences 1992