6533b825fe1ef96bd1282864
RESEARCH PRODUCT
An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit
Mathias KläuiMathias KläuiDirk BackesJairo SinovaRomain LebrunRomain LebrunShilei DingShilei DingAkashdeep KamraOlena GomonayDaniel A. GraveDaniel A. GraveFelix SchreiberFrancesco MaccherozziAndrew RossLorenzo BaldratiAvner Rothschildsubject
010302 applied physicsCondensed Matter - Materials ScienceMaterials scienceCondensed Matter - Mesoscale and Nanoscale PhysicsPhysics and Astronomy (miscellaneous)Magnetic domainCondensed matter physicsMagnetoresistanceMagnonMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences02 engineering and technologySpin structure021001 nanoscience & nanotechnology01 natural sciencesCondensed Matter::Materials ScienceMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesMagnetic dampingAntiferromagnetismCondensed Matter::Strongly Correlated Electrons0210 nano-technologyAnisotropySpin (physics)description
We report room temperature long-distance spin transport of magnons in antiferromagnetic thin film hematite doped with Zn. The additional dopants significantly alter the magnetic anisotropies, resulting in a complex equilibrium spin structure that is capable of efficiently transporting spin angular momentum at room temperature without the need for a well-defined, pure easy-axis or easy-plane anisotropy. We find intrinsic magnon spin-diffusion lengths of up to 1.5 {\mu}m, and magnetic domain governed decay lengths of 175 nm for the low frequency magnons, through electrical transport measurements demonstrating that the introduction of non-magnetic dopants does not strongly reduce the transport length scale showing that the magnetic damping of hematite is not significantly increased. We observe a complex field dependence of the non-local signal independent of the magnetic state visible in the local magnetoresistance and direct magnetic imaging of the antiferromagnetic domain structure. We explain our results in terms of a varying and applied-field-dependent ellipticity of the magnon modes reaching the detector electrode allowing us to tune the spin transport.
year | journal | country | edition | language |
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2020-11-19 | Applied Physics Letters |