The oxidation of sputtered NiFe(20 wt.%, Permalloy) thin films with a thick
ness of 180 mn was studied during annealing up to 400 degreesC for 2 h in a
ir. The composition and the thickness of the oxide layer and the compositio
nal change in the NiFe alloy laver as well as the microstructure of the fil
m were investigated by Auger electron spectroscopy, X-ray diffraction, and
transmission electron microscopy. Distinct oxidation starts at about 300 de
greesC. The formed oxide layer consists of Fe2O3. The Fe concentration in t
he NiFe layer decreases with the oxidation which leads to changes of the pr
operties of this layer. (C) 2001 Else-vier Science B.V. All rights reserved
.