Non-local magnon transconductance in extended magnetic insulating films.\\ Part I: spin diode effect
arXiv:2210.08304 · doi:10.1103/PhysRevB.108.144410
Abstract
This review provides a comprehensive study of the nonlinear transport properties of magnons, which are electrically emitted or absorbed inside extended YIG films by spin transfer effects via a YIGPt interface. Our purpose is to experimentally elucidate the pertinent picture behind the asymmetric electrical variation of the magnon transconductance analogous to an electric diode. The feature is rooted in the variation of the density of low-lying spin excitations via an electrical shift of the magnon chemical potential. As the intensity of the spin transfer increases in the forward direction (regime of magnon emission), the transport properties of low-energy magnon go through 3 distinct regimes: \textit{i)} at low currents, where the spin current is a linear function of the electrical current, the spin transport is ballistic and set by the film thickness; \textit{ii)} for amplitudes of the order of the damping compensation threshold, it switches to a highly correlated regime limited by magnon-magnon relaxation process and marked by a saturation of the magnon transconductance. Here the main bias, that controls the magnon density, are thermal fluctuations beneath the emitter. \textit{iii)} As the temperature under the emitter approaches the Curie temperature, scattering with high-energy magnons dominates, leading to diffusive transport. We note that such sequence of transport regimes bears analogy with electron hydrodynamic transport in ultra-pure media predicted by Radii Gurzhi. This study restricted to low energy part of the magnon manifold complements part II of this review\cite{kohno_2F}, which concentrates instead on the whole spectrum of propagating magnons.
References in corpus (21)
- Spin Seebeck insulator
- Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces
- Roadmap on Spin-Wave Computing
- Spin-transfer-driven ferromagnetic resonance of individual nanomagnets
- Electronic control of the spin-wave damping in a magnetic insulator
- Magnetization oscillations and waves driven by pure spin currents
- Spin Insulatronics
- Influence of yttrium iron garnet thickness and heater opacity on the nonlocal transport of electrically and thermally excited magnons
- Spin-orbit-torque magnonics
- Spin Currents and Magnon Dynamics in Insulating Magnets
- Controlled nonlinear magnetic damping in spin-Hall nano-devices
- Perspectives on spintronic diodes
- Evidence for spin current driven Bose-Einstein condensation of magnons
- Imaging spin-wave damping underneath metals using electron spins in diamond
- Control of the Bose-Einstein Condensation of Magnons by the Spin-Hall Effect
- All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators
- Asymmetric spin wave dispersion due to a saturation magnetization gradient
- Magnon transport in /Pt nanostructures with reduced effective magnetization
- Breaking down the magnonic Wiedemann-Franz law in the hydrodynamic regime
- Stabilization of a nonlinear bullet coexisting with a Bose-Einstein condensate in a rapidly cooled magnonic system driven by a spin-orbit torque
- Non-local magnon transconductance in extended magnetic insulating films.\\Part II: two-fluid behavior