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Excitation of coherent high-frequency magnons (quanta of spin waves) iscritical to the development of high-speed magnonic devices. Here wecomputationally demonstrate the excitation of coherent sub-terahertz (THz)magnons in ferromagnetic (FM) and antiferromagnetic (AFM) thin films by aphotoinduced picosecond acoustic pulse. Analytical calculations are alsoperformed to reveal the magnon excitation mechanism. Through spin pumping andspin-charge conversion, these magnons can inject sub-THz charge current into anadjacent heavy-metal film which in turn emits electromagnetic (EM) waves. Usinga dynamical phase-field model that considers the coupled dynamics of acousticwaves, spin waves, and EM waves, we show that the emitted EM wave retains thespectral information of all the sub-THz magnon modes and has a sufficientlylarge amplitude for near-field detection. These predictions indicate that theexcitation and detection of sub-THz magnons can be realized in rationallydesigned FM or AFM thin-film heterostructures via ultrafast optical-pumpTHz-emission-probe spectroscopy.

Excitation and detection of coherent sub-terahertz magnons in ferromagnetic and antiferromagnetic heterostructures