Spin angular momentum transfer in magnetic bilayers offers the possibility of ultrafast and low-loss operation for next-generation spintronic devices. We report the field- and temperature- dependent measurements on the magnetization precessions in Co2FeAl/(Ga,Mn)As by time-resolved magneto-optical Kerr effect (TRMOKE). Analysis of the effective Gilbert damping and phase shift indicates a clear signature of an enhanced dynamic exchange coupling between the two ferromagnetic (FM) layers due to the reinforced spin pumping at resonance. The temperature dependence of the dynamic exchange-coupling reveals a primary contribution from the ferromagnetism in (Ga,Mn)As.
@article{arxiv.2203.03225,
title = {Ultrafast optical observation of spin-pumping induced dynamic exchange coupling in ferromagnetic semiconductor/metal bilayer},
author = {X. Liu and P. Liu and H. C. Yuan and J. Y. Shi and H. L. Wang and S. H. Nie and F. Jin and Z. Zheng and X. Z. Yu and J. H. Zhao and H. B. Zhao and G. Lüpke},
journal= {arXiv preprint arXiv:2203.03225},
year = {2023}
}
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arXiv admin note: text overlap with arXiv:2203.00293