Damping of Confined Modes in a Ferromagnetic Thin Insulating Film: Angular Momentum Transfer Across a Nanoscale Field-defined Interface

Abstract

We observe a dependence of the damping of a confined mode of precessing ferromagnetic magnetization on the size of the mode. The micron-scale mode is created within an extended, unpatterned YIG film by means of the intense local dipolar field of a micromagnetic tip. We find that damping of the confined mode scales like the surface-to-volume ratio of the mode, indicating an interfacial damping effect (similar to spin pumping) due to the transfer of angular momentum from the confined mode to the spin sink of ferromagnetic material in the surrounding film. Though unexpected for insulating systems, the measured intralayer spin-mixing conductance $g_{\uparrow \downarrow }=5.3\times 10^{19}{\mathrm{m}}^{-2}$ demonstrates efficient intralayer angular momentum transfer.

arXiv comment4 pages, 5 figures

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• Nanoscale X-Ray Imaging of Spin Dynamics in Yttrium Iron Garnet
• Experimental and Numerical Understanding of Localized Spin Wave Mode Behavior in Broadly Tunable Spatially Complex Magnetic Configurations
• Characterization of spin relaxation anisotropy in Co using spin pumping
• Optical conductivity of the type-II Weyl semimetal WTe${}_2$ under pressure
• Spin orbit torque nano-oscillators by dipole field-localized spin wave modes