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arXiv · 1808.05707

Laser-induced antiferromagnetic-like resonance in amorphous ferrimagnets

S. Mizukami·Y. Sasaki·D. -K. Lee·H. Yoshikawa·A. Tsukamoto·K. -J. Lee·T. Ono
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Abstract

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.

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S. Mizukami, Y. Sasaki, D. -K. Lee, H. Yoshikawa, A. Tsukamoto, K. -J. Lee, T. Ono. 2018-08-17. Laser-induced antiferromagnetic-like resonance in amorphous ferrimagnets. https://arxiv.org/abs/1808.05707

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