Exceptional sign changes of the non-local spin Seebeck effect in antiferromagnetic hematite

Abstract

Low power spintronic devices based on the propagation of pure magnonic spin currents in antiferromagnetic insulator materials offer several distinct advantages over ferromagnetic components including higher frequency magnons and a stability against disturbing external magnetic fields. In this work, we make use of the insulating antiferromagnetic phase of iron oxide, the mineral hematite $\alpha$-Fe${}_2$O${}_3$ to investigate the long distance transport of thermally generated magnonic spin currents. We report on the excitation of magnons generated by the spin Seebeck effect, transported both parallel and perpendicular to the antiferromagnetic easy-axis under an applied magnetic field. Making use of an atomistic hematite toy model, we calculate the transport characteristics from the deviation of the antiferromagnetic ordering from equilibrium under an applied field. We resolve the role of the magnetic order parameters in the transport, and experimentally we find significant thermal spin transport without the need for a net magnetization.

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Cited by in corpus (12)

• Roadmap on Spin-Wave Computing
• Anisotropic long-range spin transport in canted antiferromagnetic orthoferrite YFeO${}_3$
• Spin and spin current -- From fundamentals to recent progress
• Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
• Observation of nonreciprocal magnon Hanle effect
• Antiferromagnetic resonance in $\alpha$-Fe${}_2$O${}_3$ up to its Néel temperature
• Spin Seebeck effect at low temperatures in the nominally paramagnetic insulating state of vanadium dioxide
• Insight into the structural and magnetotransport properties of epitaxial heterostructures $\alpha$-Fe${}_2$O${}_3$-Pt(111): Role of the reversed layer sequence
• Unconventional magnon transport in antiferromagnet NiPS${}_3$ induced by an anisotropic spin-flop transition
• Amplifying the antiferromagnetic spin Seebeck effect through topological magnons
• Influence of low-energy magnons on magnon Hanle experiments in easy-plane antiferromagnets
• Spin Seebeck in the weak exchange coupled van der Waals antiferromagnet