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We report room temperature long-distance spin transport of magnons inantiferromagnetic thin film hematite doped with Zn. The additional dopantssignificantly alter the magnetic anisotropies, resulting in a complexequilibrium spin structure that is capable of efficiently transporting spinangular momentum at room temperature without the need for a well-defined, pureeasy-axis or easy-plane anisotropy. We find intrinsic magnon spin-diffusionlengths of up to 1.5 {\mu}m, and magnetic domain governed decay lengths of 175nm for the low frequency magnons, through electrical transport measurementsdemonstrating that the introduction of non-magnetic dopants does not stronglyreduce the transport length scale showing that the magnetic damping of hematiteis not significantly increased. We observe a complex field dependence of thenon-local signal independent of the magnetic state visible in the localmagnetoresistance and direct magnetic imaging of the antiferromagnetic domainstructure. We explain our results in terms of a varying andapplied-field-dependent ellipticity of the magnon modes reaching the detectorelectrode allowing us to tune the spin transport.

An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit