Structural and Magnetic Properties of Permalloy Films
- 1 April 1959
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 30 (4), S274-S275
- https://doi.org/10.1063/1.2185927
Abstract
The wall motion coercive force and the rotational coercive force of thin electroplated nickel‐iron films are studied as a function of film roughness. Three types of roughness are considered : the first, periodic with a wavelength large compared to a domain wall width and an amplitude small compared with the film thickness; the second, of the order of size of a domain wall; and the third, a substrate roughness that is large compared to the film thickness. was found to be related to film thickness according to . This observation was predicted by Néel, except that his assumption of a form of roughness only of the first kind led to a single value for of . Electron micrographs showed that roughness of the second kind increased with film thickness, indicating that depends on this factor. Roughness of the third kind, as introduced by unidirectional polishing, results in an increase of , while and are not affected. This third type of roughness was observed to orient the easy magnetic axis parallel to the polishing grooves.
Keywords
This publication has 2 references indexed in Scilit:
- Coercive ForcevsThickness for Thin Films of Nickel-IronPhysical Review B, 1958
- Remarques sur la théorie des propriétés magnétiques des couches minces et des grains finsJournal de Physique et le Radium, 1956