Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Poster II

MA 31.33: Poster

Mittwoch, 19. März 2025, 17:00–19:30, P1

Investigating Spin Cherenkov Radiation in Magnetic Materials Using MuMax3 Simulations — •Kawa Noman, Matthias Schweizer, Vitaliy Vasyuchka, and Mathias Weiler — Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

Spin Cherenkov Radiation (SCE) is a groundbreaking mechanism that enables the emission of spin waves (magnons) in ferromagnetic materials when an external perturbation surpasses the minimum phase velocity of these spin waves. In this study, we employ MuMax3 micromagnetic simulations to investigate SCE induced by high-amplitude Surface Acoustic Waves (SAWs) in Yttrium Iron Garnet (YIG) thin films. Our simulations reveal that SAWs propagating at velocities exceeding the spin wave phase velocity efficiently excite coherent spin wave modes, exhibiting characteristic Cherenkov like conical wavefronts. Through comparative analysis with Cobalt Iron Boron (CoFeB), we affirm the universal nature of SCE across diverse ferromagnetic materials, thereby highlighting its significant potential for advanced applications in magnonic and spintronic devices. This study not only establishes spin Cherenkov Radiation as a fundamental physical phenomenon but also paves the way for innovative technologies that leverage controlled spin wave emission.

Keywords: Magnonics; Surface-acoustic waves