Rotating Anisotropies Without Superparamagnetic Grains in Exchange Bias Systems
Abstract
We introduce a random field model with anisotropic interfacial exchange for ferromagnet/antiferromagnet bilayers and calculate average coupling energies and coupling directions for different grain or domain sizes. The model is shown to reconcile Malozemoff's random field Ising model for exchange bias with the spinflop coupling mechanism. Furthermore, we find that for small and mid size domains, the average coupling direction strongly varies between different interfacial configurations. We show how this behavior can lead to rotating anisotropies in systems with very strong magnetocrystalline anisotropies, where the use of superparamagnetic grains or domains in the antiferromagnet is not justified.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2003
- Accession Number
- ADP014309
Entities
People
- T. C. Schultess
Organizations
- Oak Ridge National Laboratory