Thermally controlled confinement of spin wave field in a magnonic YIG waveguide

Abstract

Methods for detecting spin waves rely on electrodynamical coupling between the spin wave dipolar field and an inductive probe. While this coupling is usually treated as constant, in this work, we experimentally and theoretically show that it is indeed temperature dependent. By measuring the spin wave magnetic field as a function of temperature of, and distance to the sample, we demonstrate that there is both a longitudinal and transversal confinement of the field near the YIG-Air interface. Our results are relevant for spin wave detection, in particular in the field of spin wave caloritronics.

Frequency-selective spin-wave propagation in magnonic waveguide with a local laser-heated region

“…In MNs the properties of SWs are determined by the dipole and exchange interactions and can be changed significantly by the variation of the parameters of the medium, for example, by a variation in the direction and absolute value of the equilibrium magnetization caused by elastic deformations [13,19], a modification of ferrite film substrate properties by laser radiation [12], or by local laser heating of the ferrite films themselves [20,21]. The concept of surface spin-wave modulation in a garnet film by optical pulses was demonstrated by Fetisov and colleagues [22,23], who showed that fast heating and slow cooling lead to a significant variation of the SW transmission and SW pulse shape.…”