Enhanced Spin Conductance of a Thin-Film Insulating Antiferromagnet

Abstract

We investigate spin transport by thermally excited spin waves in an antiferromagnetic insulator. Starting from a stochastic Landau-Lifshitz-Gilbert phenomenology, we obtain the out-of-equilibrium spin-wave properties. In linear response to spin biasing and a temperature gradient, we compute the spin transport through a normal metal$|$antiferromagnet$|$normal metal heterostructure. We show that the spin conductance diverges as one approaches the spin-flop transition; this enhancement of the conductance should be readily observable by sweeping the magnetic field across the spin-flop transition. The results from such experiments may, on the one hand, enhance our understanding of spin transport near a phase transition, and on the other be useful for applications that require a large degree of tunability of spin currents. In contrast, the spin Seebeck coefficient does not diverge at the spin-flop transition. Furthermore, the spin Seebeck coefficient is finite even at zero magnetic field, provided that the normal metal contacts break the symmetry between the antiferromagnetic sublattices.

arXiv comment8 pages, 3 figures

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Cited by in corpus (32)

• Electrically controlled long-distance spin transport through an antiferromagnetic insulator
• Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3
• Dynamics of the antiferromagnetic skyrmion induced by a magnetic anisotropy gradient
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• Propagation length of antiferromagnetic magnons governed by domain configurations
• Spin Seebeck imaging of spin-torque switching in antiferromagnetic Pt/NiO heterostructures
• Bulk and edge spin transport in topological magnon insulators
• Spin pumping and shot noise in ferrimagnets: bridging ferro- and antiferromagnets
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• Spin Transport in Thick Insulating Antiferromagnetic Films
• Exceptional sign changes of the non-local spin Seebeck effect in antiferromagnetic hematite
• Magnon-polarons in cubic collinear Antiferromagnets
• Interfacial Spin Seebeck effect in noncollinear magnetic systems
• Local and nonlocal spin Seebeck effect in lateral Pt-$\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_3$-Pt devices at low temperatures
• Spin Seebeck effect in paramagnets and antiferromagnets at elevated temperatures
• Cross-sublattice Spin Pumping and Magnon Level Attraction in van der Waals Antiferromagnets
• Distinguishing antiferromagnetic spin sublattices via the spin Seebeck effect
• An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit
• Universal field dependence of magnetic resonance near zero frequency
• Spin transfer and spin pumping in disordered normal metal-antiferromagnetic insulator systems
• Magnetic field control of antiferromagnetic domain walls in a thermal gradient
• Magnon drag in a metal-insulating antiferromagnet bilayer
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• Probing the Manipulation of Antiferromagnetic Order in CuMnAs Films Using Neutron Diffraction
• Electron-magnon spin conversion and magnonic spin pumping in antiferromagnet/heavy metal heterostructure
• Intrinsic Spin Decay Length in Antiferromagnetic Insulator
• Introducing the step Monte Carlo method for simulating dynamic properties
• Spin Seebeck in the weak exchange coupled van der Waals antiferromagnet
• Ginzburg-Landau theory of spin pumping through an antiferromagnetic layer near the Néel temperature
• Magnonic Spin-Transfer Torque in Ferromagnet/Antiferromagnet/Ferromagnet Trilayer
• Observation of Dyakonov-Perel-type magnon spin relaxation in uniaxial antiferromagnetic insulators
• Ground and Applied-Field-Driven Magnetic States of Antiferromagnets