Magnon Transport in the Presence of Antisymmetric Exchange in a Weak Antiferromagnet

Abstract

The Dzyaloshinskii-Moriya interaction (DMI) is at the heart of many modern developments in the research field of spintronics. DMI is known to generate noncollinear magnetic textures, and can take two forms in antiferromagnets: homogeneous or inter-sublattice, leading to small, canted moments and inhomogeneous or intra-sublattice, leading to formation of chiral structures. In this work, we first determine the strength of the effective field created by the DMI, using SQUID based magnetometry and transport measurements, in thin films of the antiferromagnetic iron oxide hematite, $\alpha$-Fe${}_2$O${}_3$. We demonstrate that DMI additionally introduces reconfigurability in the long distance magnon transport in these films under different orientations of a magnetic field. This arises as a hysteresis centred around the easy-axis direction for an external field rotated in opposing directions whose width decreases with increasing magnetic field as the Zeeman energy competes with the effective field created by the DMI.

References in corpus (8)

• Negative spin Hall magnetoresistance of Pt on the bulk easy-plane antiferromagnet NiO
• Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3
• Observation of Antiferromagnetic Magnon Pseudospin Dynamics and the Hanle effect
• Efficient spin torques in antiferromagnetic CoO/Pt quantified by comparing field- and current- induced switching
• Structural sensitivity of the spin Hall magnetoresistance in antiferromagnetic thin films
• Origin and tailoring of the antiferromagnetic domain structure in $\alpha$-Fe${}_2$O${}_3$ thin films unraveled by statistical analysis of dichroic spectro-microscopy (X-PEEM) images
• An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit
• Electrical detection of the spin reorientation transition in antiferromagnetic TmFeO${}_3$ thin films by spin Hall magnetoresistance

Cited by in corpus (4)

• Quantum Sensing of Antiferromagnetic Magnon Two-Mode Squeezed Vacuum
• Micromagnetic study of spin transport in easy-plane antiferromagnetic insulators
• Thickness-dependent magnon spin transport in antiferromagnetic insulators: Crossover from quasi-three-dimensional to quasi-two-dimensional regimes
• Squeezing and quantum control of antiferromagnetic magnon pseudospin