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MA: Fachverband Magnetismus

MA 16: Magnonics I

MA 16.2: Vortrag

Dienstag, 19. März 2024, 09:45–10:00, EB 107

Resonant excitation of vortex gyrotropic mode via surface acoustic waves — •Abbas Koujok¹, Alejandro Riveros², Davi R. Rodrigues³, Giovanni Finocchio⁴, Mathias Weiler¹, Abbass Hamadeh¹, and Philipp Pirro¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — ²Escuela de Ingeniería, Universidad Central de Chile, 8330601 Santiago, Chile — ³Department of Electrical and Information Engineering, Politecnico di Bari, 70126 Bari, Italy — ⁴Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, 98166, Messina, Italy

With the increasing demand to miniaturize data processing devices while reducing power consumption and enhancing performance, magnonic circuits have been identified as a promising candidate in the framework of non-conventional computing. However, energy-efficient conversion from the magnonic to the electronic domain and vice versa remains a challenge for magnonics. Here, we propose a method of vortex core gyrotropic excitation relying solely on electric fields rather than on the flow of electric current, hence minimizing Ohmic losses resultant of Joule heating. Our method employs surface acoustic waves (SAWs) to excite vortex dynamics via inverse magnetostriction. We present an analytical model validated by micromagnetic simulations to demonstrate the ability of resonant SAWs to drive the gyrotropic motion of the vortex core. Varying the amplitude of the SAW, we can control the radius of the trajectory underwent by the vortex core.

Keywords: Magnetic vortex; Driven dynamics; Surface Acoustic Waves; Inverse Magnetostriction; Gyrotropic mode