Controlling the propagation of spin waves in hybrid YIG/FeRh structures through thermally induced modulation of magnetization.
Andrey S. Ptashenko1, Alexandr V. Sadovnikov1; 1Saratov State University, Saratov, Russia
Abstract
The development of energy efficient magnonic devices requires advanced methods for controlling spin wave propagation. Materials exhibiting a first order magnetic phase transition, such as the iron rhodium alloy, offer unique opportunities for dynamic tuning due to their drastic magnetization changes near room temperature. In this study, we investigate the thermally induced control of magnetostatic surface spin wave propagation in a hybrid structure comprising a yttrium iron garnet microwave waveguide and a narrow iron rhodium strip. By applying an external magnetic field and numerically modeling the system, we analyze the spatial distribution of spin wave intensity under varying magnetization states corresponding to different temperatures. Our results demonstrate that modulating the magnetization fundamentally alters the spin wave dynamics. At zero magnetization, the spin waves exhibit transverse mode interference and rapid attenuation. As the magnetization increases to an intermediate value, the spin wave intensity strongly localizes in the uncovered garnet regions, concentrating precisely at the interface. Furthermore, upon reaching the saturated ferromagnetic state, the spin wave propagation is completely redirected, forcing the waves to concentrate and propagate within a narrow magnonic channel located directly underneath the metallic layer. This thermally driven spatial switching of spin wave intensity from attenuation to edge localization and subsurface channeling highlights the exceptional potential of these heterostructures. Ultimately, this mechanism paves the way for the design of novel thermally controlled magnonic logic circuits, switches, and advanced spintronic devices.
Speaker
Ptashenko Andrey Sergeevich
Saratov State University
Russian
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