Lateral transport properties of thermally excited magnons in yttrium iron garnet films

Abstract

Spin information carried by magnons is attractive for computing technology and the development of magnon-based computing circuits is of great interest. However, magnon transport in insulators has been challenging, different from the clear physical picture for spin transport in conductors. Here we investigate the lateral transport properties of thermally excited magnons in yttrium iron garnet (YIG), a model magnetic insulator. Polarity reversals of detected spins in non-local geometry devices have been experimentally observed and are strongly dependent on temperature, YIG film thickness, and injector-detector separation distance. A competing two-channel transport model for thermally excited magnons is proposed, which is qualitatively consistent with the spin signal behavior. In addition to the fundamental significance for thermal magnon transport, our work furthers the development of magnonics by creating an easily accessible magnon source with controllable transport

17 pages, 5 figures, to appear in Appl. Phys. Lett

References in corpus (6)

• Spin Seebeck insulator
• Theory of magnon-driven spin Seebeck effect
• Spin Wave Magnetic NanoFabric: A New Approach to Spin-based Logic Circuitry
• Spin convertance at magnetic interfaces
• Temperature dependence of the magnon spin diffusion length and magnon spin conductivity in the magnetic insulator yttrium iron garnet
• Influence of yttrium iron garnet thickness and heater opacity on the nonlocal transport of electrically and thermally excited magnons

Cited by in corpus (10)

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• Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
• Criteria for accurate determination of the magnon relaxation length from the nonlocal spin Seebeck effect
• Green's function formalism for spin transport in metal-insulator-metal heterostructures
• Local and nonlocal spin Seebeck effect in lateral Pt-$\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_3$-Pt devices at low temperatures
• Transient response of spin Peltier effect revealed by lock-in thermoreflectance measurement
• Magnetic field dependence of the nonlocal spin Seebeck effect in Pt/YIG/Pt systems at low temperatures
• Absence of evidence of spin transport through amorphous Y${}_3$Fe${}_5$O${}_{12}$
• Magnon currents excited by the spin Seebeck effect in ferromagnetic EuS thin films
• Short-range Thermal Magnon Diffusion in Magnetic Garnet