Ultrafast magnetoacoustics in ferromagnetic and antiferromagnetic thin-film heterostructures

Shihao Zhuang; Jiamian Hu

doi:10.1117/12.2647481

31 January 2023 Ultrafast magnetoacoustics in ferromagnetic and antiferromagnetic thin-film heterostructures

Shihao Zhuang, Jiamian Hu

Proceedings Volume 12477, International Workshop on Thin Films for Electronics, Electro-Optics, Energy and Sensors 2022; 124770U (2023) https://doi.org/10.1117/12.2647481
Event: International Workshop on Thin Films for Electronics, Electro-Optics, Energy and Sensors, 2022, Boston, Massachusetts, 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.

Citation Download Citation

Shihao Zhuang and Jiamian Hu "Ultrafast magnetoacoustics in ferromagnetic and antiferromagnetic thin-film heterostructures", Proc. SPIE 12477, International Workshop on Thin Films for Electronics, Electro-Optics, Energy and Sensors 2022, 124770U (31 January 2023); https://doi.org/10.1117/12.2647481

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