Efficient spin transport in a paramagnetic insulator

Abstract

The discovery of new materials that efficiently transmit spin currents has been important for spintronics and material science. The electric insulator ${\mathrm{Gd}}_3{\mathrm{Ga}}_5{\mathrm{O}}_{12}$ (GGG) is a superior substrate for growing magnetic films, but has never been considered as a conduit for spin currents. Here we report spin current propagation in paramagnetic GGG over several microns. Surprisingly, the spin transport persists up to temperatures of 100 K $\gg$ $T_{\mathrm{g}}=180$ mK, GGG's magnetic glass-like transition temperature. At 5 K we find a spin diffusion length ${\lambda }_{\mathrm{GGG}}=1.8\pm 0.2\mu$m and a spin conductivity ${\sigma }_{\mathrm{GGG}}=(7.3\pm 0.3)\times 10^4$ ${\mathrm{Sm}}^{-1}$ that is larger than that of the record quality magnet ${\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$ (YIG). We conclude that exchange coupling is not required for efficient spin transport, which challenges conventional models and provides new material-design strategies for spintronic devices.

21 pages, 4 figures

References in corpus (16)

• Antiferromagnetic spintronics
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Electrically controlled long-distance spin transport through an antiferromagnetic insulator
• Magnon spin transport driven by the magnon chemical potential in a magnetic insulator
• Magnon Polarons in the Spin Seebeck Effect
• Quantum Materials for Spin and Charge Conversion
• Observation of spin current in quantum spin liquid
• Spin Transport in Antiferromagnetic Insulators Mediated by Magnetic Correlations
• 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
• Nonlocal magnon-polaron transport in yttrium iron garnet
• Competing effects at Pt/YIG interfaces: spin Hall magnetoresistance, magnon excitations and magnetic frustration
• Paramagnetic spin pumping
• Nonlocal magnon spin transport in NiFe${}_2$O${}_4$ thin films
• Spin injection and spin transport in paramagnetic insulators
• Probing short-range magnetic order in a geometrically frustrated magnet by spin Seebeck effect

Cited by in corpus (32)

• Coherent long-range transfer of angular momentum between magnon Kittel modes by phonons
• Spin Insulatronics
• 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
• Paramagnetic spin Hall magnetoresistance
• Topological transport of deconfined hedgehogs in magnets
• Differences in the magnon diffusion length for electrically and thermally driven magnon currents in Y${}_3$Fe${}_5$O${}_{12}$
• Magnetic order of Dy${}^{3+}$ and Fe${}^{3+}$ moments in antiferromagnetic DyFeO${}_3$ probed by spin Hall magnetoresistance and spin Seebeck effect
• Triplon current generation in solids
• Mechanism of paramagnetic spin Seebeck effect
• Magnetic field dependence of the nonlocal spin Seebeck effect in Pt/YIG/Pt systems at low temperatures
• Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial Bi${}_x$Y${}_{3-x}$Fe${}_5$O${}_{12}$ films
• Electrically induced strong modulation of magnons transport in ultrathin magnetic insulator films
• Role of NiO in the nonlocal spin transport through thin NiO films on Y${}_3$Fe${}_5$O${}_{12}$
• Absence of evidence of spin transport through amorphous Y${}_3$Fe${}_5$O${}_{12}$
• Magnonic thermal transport using the quantum Boltzmann equation
• Fingerprints of Universal Spin-Stiffness Jump in Two-Dimensional Ferromagnets
• Spin Hall magnetoresistance in paramagnetic NdGaO3
• Spin-pumping in superconductor-antiferromagnetic insulator bilayers
• Non-local magnon-based transport in yttrium iron garnet/platinum heterostructures at high temperatures
• Electrically induced angular momentum flow between separated ferromagnets
• Spin current injection at magnetic insulator/superconductor interfaces
• Non-local magnon transconductance in extended magnetic insulating films.\\Part II: two-fluid behavior
• Deposition temperature dependence of thermo-spin and magneto-thermoelectric conversion in Co${}_2$MnGa films on Y${}_3$Fe${}_5$O${}_{12}$ and Gd${}_3$Ga${}_5$O${}_{12}$
• Functionalized high-speed magnon-polaritons resulting from the magnetic antenna effect
• Block-Lanczos density-matrix renormalization-group approach to spin transport in Heisenberg chains coupled to leads
• Spin Hall magnetoresistance in Pt/(Ga,Mn)N devices
• Observation of quantum interference conductance fluctuations in metal rings with strong spin-orbit coupling
• Equilibrium current vortices in rare-earth-doped simple metals
• Unified theory of magnetization temperature dependence in ferrimagnets
• Pulse-assisted magnetization switching in magnetic nanowires at picosecond and nanosecond timescales with low energy
• Long-distance spin transport in frustrated hyperkagome magnet Gd3Ga5O12