Long-distance spin transport in a disordered magnetic insulator

Abstract

Spin transport through magnetic insulators via magnons has recently been explored for a growing variety of magnetic systems with long-range order and well-understood spin excitation spectra. Here we show dramatic effects of spin transport through an amorphous magnetic insulator, which is both magnetically and structurally disordered. We generate and detect spin flow though amorphous yttrium-iron-garnet ($a$-YIG) thin films in a non-local geometry by use of the spin Hall and inverse spin Hall effects in platinum strips separated by 10 or more microns. By comparing non-local spin transport in $a$-YIG on suspended micromachined thermal isolation platforms to the same experiment performed on a bulk substrate, we show strong effects of in-plane thermal gradients on spin transport in the disordered magnetic insulator. The resulting non-local voltage signals are orders of magnitude larger than those seen in crystalline magnetic insulators, with easily measurable spin signals seen even at distances in excess of $100$ microns. In analogy to heat transport, where disordered materials support a range of vibrational excitations that can allow large thermal conductivities, we suggest that efficient spin transport in disordered magnetic systems can occur via a similar spectrum of excitations that relies on strong local exchange interactions and does not require long-range order. This work not only opens a new area for fundamental experimental and theoretical studies of spin transport, but also sets a new direction in materials science for magnonic and spintronic devices.

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• Spin Hall effect
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• Antiferromagnetic spin Seebeck Effect
• Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator
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• Sensitive SQUID magnetometry for studying nano-magnetism
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• Spin Seebeck effect through antiferromagnetic NiO
• 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
• Spin wave excitation in magnetic insulators by spin-transfer torque
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• Competing effects at Pt/YIG interfaces: spin Hall magnetoresistance, magnon excitations and magnetic frustration
• Paramagnetic spin pumping
• Current-induced spin wave excitation in Pt|YIG bilayer
• Spin-transfer torque based damping control of parametrically excited spin waves in a magnetic insulator
• Minimal Model of Spin-Transfer Torque and Spin Pumping caused by Spin Hall Effect

Cited by in corpus (46)

• Photoferroelectric oxides
• Magnetic texture based magnonics
• Topological insulators and semimetals in classical magnetic systems
• Spin-orbit-torque magnonics
• Electrical generation and detection of spin waves in a quantum Hall ferromagnet
• Spin Seebeck effect in the layered ferromagnetic insulators CrSiTe${}_3$ and CrGeTe${}_3$
• Calculating the transport properties of magnetic materials from first-principles including thermal and alloy disorder, non-collinearity and spin-orbit coupling
• Emission of coherent propagating magnons by insulator-based spin-orbit torque oscillators
• Electrical properties of single crystal Yttrium Iron Garnet ultra-thin films at high temperatures
• Spin conductance of YIG thin films driven from thermal to subthermal magnons regime by large spin-orbit torque
• Spin hydrodynamics in amorphous magnets
• Magnons at low excitations: Observation of incoherent coupling to a bath of two-level-systems
• Energy Storage via Topological Spin Textures
• Role of Magnon-Magnon Scattering in Magnon Polaron Spin Seebeck Effect
• Perspective: (Beyond) spin transport in insulators
• Simultaneous Optical and Electrical Spin-Torque Magnetometry with Stroboscopic Detection of Spin-Precession Phase
• Hydrodynamics of three-dimensional skyrmions in frustrated magnets
• Nonlocal magnon spin transport in yttrium iron garnet with tantalum and platinum spin injection/detection electrodes
• Electrical control of spin mixing conductance in a Y${}_3$Fe${}_5$O${}_{12}$/Platinum bilayer
• Hydrodynamic description of long-distance spin transport through noncollinear magnetization states: the role of dispersion, nonlinearity, and damping
• Perspectives on spin hydrodynamics in ferromagnetic materials
• Strain-Tunable Magnetic Compensation Temperature of Epitaxial Tb${}_3$Fe${}_5$O${}_{12}$ Thin Films
• Absence of evidence of spin transport through amorphous Y${}_3$Fe${}_5$O${}_{12}$
• Temperature dependence of the effective spin-mixing conductance probed with lateral non-local spin valves
• Acoustic attenuation in magnetic insulator films: effects of magnon polaron formation
• Spin Transport in Quantum Spin-Orbital Liquids
• Giant dynamical electron-magnon coupling in metal-metal-ferromagnetic insulator heterostructure
• Magnon spin Hall magnetoresistance of a gapped quantum paramagnet
• Interplay of Wave Localization and Turbulence in Spin Seebeck Effect
• Non-local magnon-based transport in yttrium iron garnet/platinum heterostructures at high temperatures
• Controllable vortex shedding from dissipative exchange flows in ferromagnetic channels
• Spin current injection at magnetic insulator/superconductor interfaces
• Spin glass transition in a thin-film NiO/Permalloy bilayer
• Scattering theory of transport through disordered magnets
• Tuning Spin Transport in a Graphene Antiferromagnetic Insulator
• Intrinsic Spin Decay Length in Antiferromagnetic Insulator
• Spin pumping into a spin glass material
• Harnessing Interlayer Magnetic Coupling for Efficient, Field-Free Current-Induced Magnetization Switching in a Magnetic Insulator
• Contact solitons as spin pistons in one-dimensional ferromagnetic channels
• Dynamics of metastable contact soliton dissipative exchange flows in one-dimensional ferromagnetic channels
• Temperature crossovers in the specific heat of amorphous magnets
• Superfluid-like spin transport in the dynamic states of easy-axis magnets
• Magnetically Ordered Insulators for Advanced Spintronics
• Observation of Dyakonov-Perel-type magnon spin relaxation in uniaxial antiferromagnetic insulators
• Magnon Spectrum of the Amorphous Ferromagnet Co${}_4$P from Atomistic Spin Dynamics
• Spin Diffusion in Spin Glasses Require Two Magnetic Variables, $\vec{M}$ and $\vec{m}$