Observation of nonreciprocal magnon Hanle effect

Abstract

The precession of magnon pseudospin about the equilibrium pseudofield, the latter capturing the nature of magnonic eigen-excitations in an antiferromagnet, gives rise to the magnon Hanle effect. Its realization via electrically injected and detected spin transport in an antiferromagnetic insulator demonstrates its high potential for devices and as a convenient probe for magnon eigenmodes and the underlying spin interactions in the antiferromagnet. Here, we observe a nonreciprocity in the Hanle signal measured in hematite using two spatially separated platinum electrodes as spin injector/detector. Interchanging their roles was found to alter the detected magnon spin signal. The recorded difference depends on the applied magnetic field and reverses sign when the signal passes its nominal maximum at the so-called compensation field. We explain these observations in terms of a spin transport direction-dependent pseudofield. The latter leads to a nonreciprocity, which is found to be controllable via the applied magnetic field. The observed nonreciprocal response in the readily available hematite films opens interesting opportunities for realizing exotic physics predicted so far only for antiferromagnets with special crystal structures.

References in corpus (9)

• Magnon Mediated Electric Current Drag Across a Ferromagnetic Insulator Layer
• Chiral spin-wave velocities induced by all-garnet interfacial Dzyaloshinskii-Moriya interaction in ultrathin yttrium iron garnet films
• Control of nonlocal magnon spin transport via magnon drift currents
• Antiferromagnetic magnon pseudospin: Dynamics and diffusive transport
• Modelling spin waves in noncollinear antiferromagnets: spin-flop states, spin spirals, skyrmions and antiskyrmions
• Exceptional sign changes of the non-local spin Seebeck effect in antiferromagnetic hematite
• Spin-Wave Doppler Shift by Magnon Drag in Magnetic Insulators
• An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit
• Magnon spin transport around the compensation magnetic field in easy-plane antiferromagnetic insulators

Cited by in corpus (9)

• Fundamentals and applications of Van der Waals magnets in magnon spintronics
• Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond
• Nonreciprocal phonons in PT-symmetric antiferromagnet
• Impact of magnetic anisotropy on the magnon Hanle effect in $\alpha$-Fe${}_2$O${}_3$
• Anisotropic Field Suppression of Morin Transition Temperature in Epitaxially Grown Hematite Thin Films
• Nonreciprocal magnons in layered antiferromagnets VPX3(X =S,Se,Te)
• Squeezing and quantum control of antiferromagnetic magnon pseudospin
• Nonreciprocal Magnon Hanle Effect in Antiferromagnetic $\alpha$-Fe${}_2$O${}_3$
• Spin Wave Dispersion of the van der Waals Antiferromagnet NiPS${}_3$