Differences in the magnon diffusion length for electrically and thermally driven magnon currents in Y${}_3$Fe${}_5$O${}_{12}$

Abstract

Recent demonstration of efficient transport and manipulation of spin information by magnon currents have opened exciting prospects for processing information in devices. Magnon currents can be driven both electrically and thermally, even in magnetic insulators, by applying charge currents in an adjacent metal layer. Earlier reports in thin yttrium iron garnet (YIG) films suggested that the diffusion length of magnons is independent on the biasing method, but different values were obtained in thicker films. Here, we study the magnon diffusion length for electrically and thermally driven magnon currents in the linear regime in a 2-$\mu$m-thick YIG film as a function of temperature and magnetic field. Our results show a decrease of the magnon diffusion length with magnetic field for both biasing methods and at all temperatures from 5 to 300 K, indicating that sub-thermal magnons dominate the long-range transport. Moreover, we demonstrate that the value of the magnon diffusion length depends on the driving mechanism, suggesting that different non-equilibrium magnon distributions are biased for each method. Finally, we demonstrate that the magnon diffusion length for thermally driven magnon currents is independent of the YIG thickness and material growth conditions, confirming that this quantity is an intrinsic parameter of YIG.

20 pages, 9 figures

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• Magneto-Optical Detection of the Spin Hall Effect in Pt and W Thin Films
• Direct detection of magnon spin transport by the inverse spin Hall effect
• The effect of the magnon dispersion on the longitudinal spin Seebeck effect in yttrium iron garnets (YIG)
• Magnon-polaron transport in magnetic insulators
• Long range pure magnon spin diffusion observed in a non-local spin-Seebeck geometry
• Origin of the thickness-dependent low-temperature enhancement of spin Seebeck effect in YIG films
• Temperature dependence of the magnon spin diffusion length and magnon spin conductivity in the magnetic insulator yttrium iron garnet
• Magnetic field dependence of the magnon spin diffusion length 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
• Nonlocal magnon-polaron transport in yttrium iron garnet
• Evidence for the role of the magnon energy relaxation length in the Spin Seebeck Effect
• Competing effects at Pt/YIG interfaces: spin Hall magnetoresistance, magnon excitations and magnetic frustration
• Magnetic field control of the spin Seebeck effect
• Large room temperature spin-to-charge conversion signals in a few-layer graphene/Pt lateral heterostructure
• Theory of Spin Hall Magnetoresistance from a Microscopic Perspective
• Efficient spin transport in a paramagnetic insulator
• Electrical properties of single crystal Yttrium Iron Garnet ultra-thin films at high temperatures
• Nonlocal magnon spin transport in NiFe${}_2$O${}_4$ thin films
• Magnon mode selective spin transport in compensated ferrimagnets
• Spin conductance of YIG thin films driven from thermal to subthermal magnons regime by large spin-orbit torque
• Criteria for accurate determination of the magnon relaxation length from the nonlocal spin Seebeck effect
• Thermally Driven Long Range Magnon Spin Currents in Yttrium Iron Garnet due to Intrinsic Spin Seebeck Effect
• Long lifetime of thermally-excited magnons in bulk yttrium iron garnet
• Spin-Hall magnetoresistance in a low-dimensional magnetic insulator
• Lateral transport properties of thermally excited magnons in yttrium iron garnet films
• Spin-dependent (inverse) spin Hall effect in Co${}_{60}$Fe${}_{20}$B${}_{20}$
• Anomalous Hall-like transverse magnetoresistance in Au thin films on Y${}_3$Fe${}_5$O${}_{12}$
• Magnetic field dependence of the nonlocal spin Seebeck effect in Pt/YIG/Pt systems at low temperatures
• Non-local magnon transport in the compensated ferrimagnet GdIG

Cited by in corpus (11)

• Giant magnon spin conductivity approaching the two-dimensional transport regime in ultrathin yttrium iron garnet films
• Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
• Control of nonlocal magnon spin transport via magnon drift currents
• All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators
• Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial Bi${}_x$Y${}_{3-x}$Fe${}_5$O${}_{12}$ films
• Magnon currents excited by the spin Seebeck effect in ferromagnetic EuS thin films
• Observing Differential Spin Currents by Resonant Inelastic X-ray Scattering
• Non-local magnon transconductance in extended magnetic insulating films.\\Part II: two-fluid behavior
• Frequency-dependent Phonon-mediated Unidirectional Magnetoresistance in a Metal on an Insulator with Highly Nonequilibrium Magnons
• Unconventional magnon transport in antiferromagnet NiPS${}_3$ induced by an anisotropic spin-flop transition
• Anisotropic Magnon Spin Transport in Ultra-thin Spinel Ferrite Thin Films -- Evidence for Anisotropy in Exchange Stiffness