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15 March 2023 Ultrafast magnetoacoustics in ferromagnetic and antiferromagnetic thin-film heterostructures
Shihao Zhuang, Jiamian Hu
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Proceedings Volume PC12419, Ultrafast Phenomena and Nanophotonics XXVII; (2023) https://doi.org/10.1117/12.2648602
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
Excitation of coherent high-frequency magnons (quanta of spin waves) is critical to the development of high-speed magnonic devices. Here we computationally demonstrate the excitation of coherent terahertz (THz) magnons in ferromagnetic and antiferromagnetic thin films by a photoinduced picosecond acoustic pulse. Analytical calculations are performed to reveal the magnon excitation mechanism. Through spin pumping and spin-charge conversion, these magnons can inject THz charge current into an adjacent heavy-metal film which in turn emits electromagnetic (EM) waves. Based on dynamical phase-field simulations, we show that the emitted EM wave retains the spectral information of all the magnon modes, providing a basis for detection via THz emission spectroscopy.
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Shihao Zhuang and Jiamian Hu "Ultrafast magnetoacoustics in ferromagnetic and antiferromagnetic thin-film heterostructures", Proc. SPIE PC12419, Ultrafast Phenomena and Nanophotonics XXVII, (15 March 2023); https://doi.org/10.1117/12.2648602
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KEYWORDS
Ferromagnetics
Heterojunctions
Magnons
Thin films
Ultrafast phenomena
Terahertz radiation
Emission spectroscopy
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