Broadband ferromagnetic resonance characterization of GaMnAs thin films
Aymen Ben Hamida, Sibylle Sievers, Klaus Pierz, Hans Werner, Schumacher
TL;DR
This study uses broadband ferromagnetic resonance to analyze the magnetization dynamics of GaMnAs thin films at cryogenic temperatures, revealing how annealing affects their magnetic properties.
Contribution
It introduces a broadband FMR method to characterize GaMnAs thin films and models their magnetic behavior using an extended Kittel model.
Findings
FMR frequencies depend on in-plane field angle and amplitude
Magnetic parameters are derived from FMR data
Annealing modifies the FMR behavior and magnetic parameters
Abstract
The precessional magnetization dynamics of GaMnAs thin films are characterized by broadband network analyzer ferromagnetic resonance (FMR) in a coplanar geometry at cryogenic temperatures. The FMR frequencies are characterized as function of in-plane field angle and field amplitude. Using an extended Kittel model of the FMR dispersion the magnetic film parameters such as saturation magnetization and anisotropies are derived. The modification of the FMR behavior and of the magnetic parameters of the thin film upon annealing is analyzed.
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