Magnetization dynamics of the ferrimagnet CoGd near the compensation of magnetization and angular momentum

Abstract

Magnetization dynamics in alloys of ferrimagnetic CoGd have been studied in the vicinity of the magnetization and angular momentum
compensation point as a function of alloy composition and temperature.
In agreement with standard mean-field treatments of the dynamics of the
total magnetization we observe an increase of the precessional
frequency and the effective damping parameter near the angular momentum
compensation point. We demonstrate the consistency of the magnetization
dynamics extracted from frequency domain methods such as ferromagnetic
resonance and time resolved laser pump-probe measurements.