Magnon transport in ${\mathbf{Y}}_3\mathbf{F}{\mathbf{e}}_5{\mathbf{O}}_{12}$/Pt nanostructures with reduced effective magnetization

Abstract

For applications making use of magnonic spin currents damping effects, which decrease the spin conductivity, have to be minimized. We here investigate the magnon transport in an yttrium iron garnet thin film with strongly reduced effective magnetization. We show that in a three-terminal device the effective magnon conductivity can be increased by a factor of up to six by a current applied to a modulator electrode, which generates damping compensation above a threshold current. Moreover, we find a linear dependence of this threshold current on the applied magnetic field. We can explain this behavior by the reduced effective magnetization and the associated nearly circular magnetization precession.

References in corpus (4)

• Influence of yttrium iron garnet thickness and heater opacity on the nonlocal transport of electrically and thermally excited magnons
• Spin Currents and Magnon Dynamics in Insulating Magnets
• Dynamic phase diagram of dc-pumped magnon condensates
• Controlled nonlinear magnetic damping in spin-Hall nano-devices

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• Non-local magnon transconductance in extended magnetic insulating films.\\ Part I: spin diode effect
• Non-local magnon transconductance in extended magnetic insulating films.\\Part II: two-fluid behavior
• Reduced effective magnetization and damping by slowly-relaxing impurities in strained $\gamma$-$\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3$ thin films
• Ellipticity effects on diffusive magnon spin and heat transport in easy-plane ferromagnets