2005/08/30 by Th. Gerrits, Michael L. Schneider, M. L. Schneider +3
Engineering · Materials Science · Mathematics · Physics and Astronomy · #Amplitude #Atomic physics #Condensed matter physics #Excitation #Ferromagnetic resonance #Ferromagnetism #Field (mathematics) #Magnetic Properties and Applications #Magnetic field #Magnetic properties of thin films #Magnetization #Magnetization dynamics #Magneto-Optical Properties and Applications #Magnetometer #Materials science #Mathematics #Nonlinear system #Nuclear magnetic resonance #Optics #Permalloy #Physics #Resonance (particle physics) #cond-mat.mtrl-sci #cond-mat.other
paper · pdf · doi:10.1103/physrevb.73.094454
23 pages, 8 figures, submitted to PRB
arxiv created 2005/08/30 · openalex publication_date 2006/03/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A time-resolved ferromagnetic resonance technique was used to investigate the nonlinear magnetization dynamics of a thin film in response to a sequence of large-amplitude field pulses. The magnetic field pulse sequence was set at a repetition rate equal to the magnetic system's resonance frequency. Both inductive and optical techniques were used to observe the resultant magnetization dynamics. We compared data obtained by this technique with conventional pulsed inductive microwave magnetometry. The results for damping and frequency response obtained by these two different methods coincide in the limit of a small-angle excitation. However, when applying large-amplitude field pulses, there was a substantial increase in the apparent damping. Analysis of vector-resolved magnetic second-harmonic generation data indicate that the increase in damping is correlated with a decrease in the spatial homogeneity of the magnetization dynamics. This suggests that unstable spin wave generation occurs in the limit of large-amplitude dynamics.