Propagating spin waves in nanometer-thick yttrium iron garnet films: Dependence on wave vector, magnetic field strength and angle

Abstract

We present a comprehensive investigation of propagating spin waves in nanometer-thick yttrium iron garnet (YIG) films. We use broadband spin-wave spectroscopy with integrated coplanar waveguides (CPWs) and microstrip antennas on top of continuous and patterned YIG films to characterize spin waves with wave vectors up to 10 rad/$\mu$m. All films are grown by pulsed laser deposition. From spin-wave transmission spectra, parameters such as the Gilbert damping constant, spin-wave dispersion relation, group velocity, relaxation time, and decay length are derived and their dependence on magnetic bias field strength and angle is systematically gauged. For a 40-nm-thick YIG film, we obtain a damping constant of $3.5\times 10^{-4}$ and a maximum decay length of 1.2 mm. Our experiments reveal a strong variation of spin-wave parameters with magnetic bias field and wave vector. Spin-wave properties change considerably up to a magnetic bias field of about 30 mT and above a field angle of ${\theta }_H=20^{\circ }$, where ${\theta }_H=0^{\circ }$ corresponds to the Damon-Eshbach configuration.

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Cited by in corpus (14)

• Chiral spin-wave velocities induced by all-garnet interfacial Dzyaloshinskii-Moriya interaction in ultrathin yttrium iron garnet films
• Ultra Thin Films of Yttrium Iron Garnet with Very Low Damping: A Review
• Propagation of spin-waves packets in individual nano-sized yttrium iron garnet magnonic conduits
• Electrical Control of Coherent Spin Rotation of a Single-Spin Qubit
• Electrical spectroscopy of the spin-wave dispersion and bistability in gallium-doped yttrium iron garnet
• Spin wave localization and guiding by magnon band structure engineering in yttrium iron garnet
• Parametric generation of propagating spin-waves in ultra thin yttrium iron garnet waveguides
• A puzzling insensitivity of magnon spin diffusion to the presence of 180${}^{\circ }$ domain walls in a ferrimagnetic insulator
• Generation of gigahertz frequency surface acoustic waves in YIG/ZnO heterostructures
• Current-Controlled Magnon-Magnon Coupling in an On-Chip Cavity Resonator
• Wideband wide-field imaging of spin-wave propagation using diamond quantum sensors
• Functionalized high-speed magnon-polaritons resulting from the magnetic antenna effect
• Correlation between structural and magnetic properties of epitaxial YIG films by pulsed laser deposition
• Anisotropic Magnon Spin Transport in Ultra-thin Spinel Ferrite Thin Films -- Evidence for Anisotropy in Exchange Stiffness