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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
