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Competing Mechanisms of Polarization-Controlled Terahertz Emission in Co/Mo Spintronic Bilayers

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This work reveals unique terahertz emission mechanisms in Co/Mo bilayers, highlighting ISHE and nonlinear processes.

The study demonstrates polarization-dependent anisotropic THz emission from a Co/Mo bilayer.
Around 70% of THz emission is attributed to the inverse spin Hall effect while the rest stems from second-order processes.
Observations are derived from systematic experiments on azimuthal rotation and pump pulse polarization.
The findings reveal new design rules for THz emitters leveraging interfacial spin–orbit coupling and inversion symmetry.

Avdeev et al. (2025) studied this question.

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