The magnetization dynamics for ferrimagnets at the angular momentum compensation temperature T_A is believed to be analogous to that for antiferromagnets. We investigated the pulsed-laser-induced magnetization dynamics in amorphous rare-earth transition-metal ferrimagnet films with a T_A just above room temperature. For a low pulse fluence, the magnetization precession frequency decreases as the applied magnetic field increases, whereas for a higher pulse fluence, it increases as the applied field increases. The result was well explained by the left-handed and right-handed precession modes of the antiferromagnetic-like resonance at temperatures below and above T_A, respectively, and the data were in agreement with the theoretical simulation. The study demonstrated the experimental route to achieving antiferromagnetic resonance in ferrimagnets using a pulsed laser.
@article{arxiv.1808.05707,
title = {Laser-induced antiferromagnetic-like resonance in amorphous ferrimagnets},
author = {S. Mizukami and Y. Sasaki and D. -K. Lee and H. Yoshikawa and A. Tsukamoto and K. -J. Lee and T. Ono},
journal= {arXiv preprint arXiv:1808.05707},
year = {2018}
}