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

Andrew Ross, Romain Lebrun, Lorenzo Baldrati, Akashdeep Kamra, Olena Gomonay, Shilei Ding, Felix Schreiber, Dirk Backes, Francesco Maccherozzi, Daniel A Grave

Research output: Contribution to journalArticlepeer-review


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 lm, and magnetic domain governed decay lengths of 175 nm for the
low-frequency magnons, through electrical transport measurements demonstrating that the introduction of nonmagnetic 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 nonlocal 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
Original languageEnglish GB
Article number242405
Pages (from-to)1-6
Number of pages6
JournalApplied Physics Letters
Issue number24
StatePublished - 2020


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