Effects of anisotropy and stress on the non-linear magnetic susceptibility of ferromagnets
Abstract
The magnetic susceptibility of ferromagnetic materials changes if mechanical stress is applied. This arises mainly because of the changes in the effective anisotropy arising from the magnetoelastic coupling. In order to correctly describe these changes theoretically by non-linear hysteresis modeling, the variation of these parameters with both anisotropy and stress must be understood. The interpretation of the underlying physics behind these variations as well as the means for determining the changes in theoretical parameters are important issues in hysteresis modeling. We report studies undertaken using two non-linear hysteresis models, namely the Jiles-Atherton model and the Hauser energetic model. The study examined the initial magnetization curve at low magnetic fields - where domain wall displacements are dominant and the anhysteretic (hysteresis-free) magnetization at high fields - where most of the magnetization processes taking place are reversible. The results were verified by comparison with experimental results taken on amorphous Co77B23 ribbon under applied tensile stress. This research was supported by the US DoE, office of Basic Energy Science, Materials Science Division. Ames Laboratory is operated for the US DoE by ISU under contract number W-7405-ENG-82.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARV27002M