Study of spin-wave propagation properties in ferrimagnetic insulator TmIG thin films

Spin wave propagation in materials exhibiting perpendicular magnetic anisotropy (PMA) has garnered significant attention due to its potential for enabling novel and energy-efficient spintronic devices [1]. Thulium iron garnet (TmIG), magnetic insulator with PMA [2], is a compelling candidate for spintronic applications due to its unique magnetic properties and spin transport characteristics [2]. In this work, we employ broadband electrical detection method to measure spin-wave (SW) propagation in thin TmIG films (thickness: 2 – 35 nm) grown by pulsed laser deposition on gadolinium-gallium-garnet (GGG) and substituted GGG (SGGG) substrates to measure SW propagation length and SW velocity [3]. We perform ferromagnetic resonance spectroscopy on TmIG thin films grown on GGG and sGGG to study effects of thickness on magnetic damping and to characterize PMA. We further examine the propagation properties of Damon–Eshbach spin-waves (DESWs) and isotropic magnetostatic forward volume spin-waves (MSFVSWs) in TmIG/GGG and TmIG/SGGG thin films. We finally outline future experiments relevant for advanced data processing and quantum magnonic applications. [1] A.V. Chumak, et al., Nat. Phys. 11(6):453 (2015). [2] C.N. Wu, et al., Sci. Rep. 8, 11087 (2018). [3] Timalsina, et al., arXiv:2310.06188 (2023).