6533b850fe1ef96bd12a8515
RESEARCH PRODUCT
Magnon transport in the presence of antisymmetric exchange in a weak antiferromagnet
Olena GomonayDaniel A. GraveAndrew RossJairo SinovaAsaf KayAvner RothschildMathias KläuiMathias KläuiRomain Lebrunsubject
PhysicsCondensed Matter - Materials ScienceAntisymmetric exchangeField (physics)SpintronicsCondensed matter physicsMagnetometerMagnonMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesElectronic Optical and Magnetic MaterialsMagnetic fieldlaw.inventionCondensed Matter::Materials Sciencelaw0103 physical sciencesAntiferromagnetismCondensed Matter::Strongly Correlated ElectronsZeeman energy010306 general physics0210 nano-technologydescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-06-24 | Journal of Magnetism and Magnetic Materials |