Spin colossal magnetoresistance in an antiferromagnetic insulator

Abstract

Colossal magnetoresistance (CMR) refers to a large change in electrical conductivity induced by a magnetic field in the vicinity of a metal-insulator transition and has inspired extensive studies for decades\cite{Ramirez1997, Tokura2006}. Here we demonstrate an analogous spin effect near the Néel temperature $T_{\mathrm{N}}$=296 K of the antiferromagnetic insulator \CrO. Using a yttrium iron garnet \YIG/\CrO/Pt trilayer, we injected a spin current from the YIG into the \CrO layer, and collected via the inverse spin Hall effect the signal transmitted in the heavy metal Pt. We observed a change by two orders of magnitude in the transmitted spin current within 14 K of the Néel temperature. This transition between spin conducting and nonconducting states could be also modulated by a magnetic field in isothermal conditions. This effect, that we term spin colossal magnetoresistance (SCMR), has the potential to simplify the design of fundamental spintronics components, for instance enabling the realization of spin current switches or spin-current based memories.

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• Spin Transport in Antiferromagnetic Insulators Mediated by Magnetic Correlations
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• Influence of interface condition on spin-Seebeck effects
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• Coherent transfer of spin angular momentum by evanescent spin waves within antiferromagnetic NiO
• Large spin Hall magnetoresistance in antiferromagnetic α-Fe2O3/Pt heterostructures
• Magnon Valves Based on YIG/NiO/YIG All-Insulating Magnon Junctions
• Spin Pumping of an Easy-Plane Antiferromagnet Enhanced by Dzyaloshinskii-Moriya Interaction
• Co-existence of Bloch and Neel walls in a collinear antiferromagnet
• Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
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• Manipulation of coupling and magnon transport in magnetic metal-insulator hybrid structures
• Magnon Pairs and Spin-Nematic Correlation in the Spin-Seebeck Effect
• Spin Transport in Thick Insulating Antiferromagnetic Films
• Antiferromagnetic insulatronics: spintronics in insulating 3d metal oxides with antiferromagnetic coupling
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• Driving a magnetized domain wall in an antiferromagnet by magnons
• Local and nonlocal spin Seebeck effect in lateral Pt-$\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_3$-Pt devices at low temperatures
• Role of spin mixing conductance in determining thermal spin pumping near the ferromagnetic phase transition in EuO_{1-x} and La2NiMnO6
• Spin Seebeck effect in quantum magnet Pb2V3O9
• Magnon-mediated interlayer coupling in an all-antiferromagnetic junction
• Spin Seebeck Effect in Nonmagnetic Excitonic Insulators
• Electrical control of spin mixing conductance in a Y${}_3$Fe${}_5$O${}_{12}$/Platinum bilayer
• Light-induced charge and spin Hall currents in materials with $C_{4}K$ symmetry
• Role of NiO in the nonlocal spin transport through thin NiO films on Y${}_3$Fe${}_5$O${}_{12}$
• Damping enhancement in coherent ferrite/insulating-paramagnet bilayers
• Scattering phenomena for spin transport in Kitaev spin liquid
• Uniaxial Néel Vector Control in Perovskite Oxide Thin Films by Anisotropic Strain Engineering
• Crossover from Diffusive to Superfluid Transport in Frustrated Magnets
• Self-supervised graph neural networks for accurate prediction of Néel temperature
• Magnon spin transport around the compensation magnetic field in easy-plane antiferromagnetic insulators
• Topological energy release from collision of relativistic antiferromagnetic solitons
• Phase transitions of the ferroelectric $({\mathrm{ND}}_4{)}_2{\mathrm{FeCl}}_5\cdot {\mathrm{D}}_2\mathrm{O}$ under a magnetic field
• Spin Seebeck effect in two-sublattice ferrimagnets in the vicinity of $T_{\mathrm{C}}$
• Observation of Dyakonov-Perel-type magnon spin relaxation in uniaxial antiferromagnetic insulators
• Long-distance spin transport in frustrated hyperkagome magnet Gd3Ga5O12