Influence of magnetic properties on magnetization dynamics of high-ρ films

The influence of magnetic properties on the magnetization dynamics of high-resistivity amorphous CoZrTa thin films was investigated. A strong correlation with magnetic coercivity was found. Even small values of coercivity have an effect on the observed FMR frequency and the effective magnetic damping parameter α. The increased coercivity is due to a locally changing magnetic anisotropy distribution acting as a trap for the domain walls. The inhomogeneous anisotropy distribution in the films leads to additional frequency components observed during the dynamic remagnetization processes. The anisotropy field is measured directly from the dynamically obtained data. The observed dynamic response of the films makes them suitable for applications in the gigahertz regime.