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MA: Fachverband Magnetismus

MA 40: Focus Session: Chiral phonons and crystals coupled to magnetic order II

MA 40.4: Vortrag

Donnerstag, 12. März 2026, 10:30–10:45, HSZ/0002

Phonon Angular Momentum Transfer Torque — •Verena Brehm¹, Daniel Bustamante Lopez², Shu Zhang³, and Dominik Juraschek¹ — ¹Department of Applied Physics and Science Education, Eindhoven University of Technology, Eindhoven, Netherlands — ²Department of Physics, Boston University, Boston, USA — ³Okinawa Institute of Science and Technology, Okinawa, Japan

Angular momentum can be carried by a variety of (quasi)particles, including magnons, photons, and phonons, whose interplay has recently opened new directions in spintronics and optoelectronics. In this talk, we demonstrate the transfer of angular momentum from a phononic system to a magnetic system via an interfacial transfer torque, which we call the Phonon Angular Momentum Transfer Torque (PAMTT). We estimate the magnitude of phonon angular momentum originating from different mechanisms, among them the recently discovered phonon angular momentum Hall effect, and explore the possible magnetization dynamics that can be induced by the resulting PAMTT. Our analysis shows that both the precessional and relaxation components of the PAMTT can be detected as shifts in frequency and broadening of the linewidth in ferromagnetic resonance (FMR) experiments.

Keywords: transfer torques; atomistic spin dynamics; PAMHE; CIPAMS