Dynamic M-H loop study of energy losses in thin Ni-Fe films
- 1 September 1967
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 3 (3) , 290-293
- https://doi.org/10.1109/tmag.1967.1066065
Abstract
Dynamic energy losses in thin Ni-Fe films during magnetization reversal under sinusoidal magnetic drive fields of 15-Oe peak at frequencies up to 50 kHz have been studied by direct observation of the dynamic M-H loop. Empirically it is found that the energy losses depend neither upon frequency alone nor peak drive fieId alone, but rather upon the slopeSin Oe/s of the drive field at the instant of magnetization reversal. Energy losses are proportional to(S)^{1/2}for smallSand toSfor largeSup toS = 5 \times 10^{6}Oe/s, the apparatus limit. Simultaneous observation of easy-axis and hard-axis pick-up loop voltage waveforms indicates that magnetization reversal occurs by coherent rotation for largeSand by domain-wall motion for smallS. Observed behavior of the energy losses is shown to be in conformity with the classical descriptions of domain-wall motion and coherent rotation.Keywords
This publication has 2 references indexed in Scilit:
- Switching of Thin Anisotropic Magnetic Films as a Function of the Rate and Amplitude of the Applied FieldJournal of Applied Physics, 1965
- Static and Dynamic Behavior of Thin Permalloy FilmsJournal of Applied Physics, 1958