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

Ross A, Lebrun R, Baldrati L, Kamra A, Gomonay O, Ding S, Schreiber F, Backes D, Maccherozzi F, Grave DA, Rothschild A, Sinova J, Klaeui M (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Applied Physics Letters American Institute of Physics (AIP)

Book Volume: 117

Article Number: 242405

Journal Issue: 24

DOI: 10.1063/5.0032940

Abstract

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 μm, 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.

Involved external institutions

NTNU Trondheim - Norwegian University of Science and Technology NO Norway (NO) Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) Diamond Light Source GB United Kingdom (GB) Ben-Gurion University of the Negev (BGU) / אוניברסיטת בן-גוריון בנגב IL Israel (IL) Technion - Israel Institute of Technology IL Israel (IL)

How to cite

APA:

Ross, A., Lebrun, R., Baldrati, L., Kamra, A., Gomonay, O., Ding, S.,... Klaeui, M. (2020). An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit. Applied Physics Letters, 117(24). https://doi.org/10.1063/5.0032940

MLA:

Ross, Andrew, et al. "An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit." Applied Physics Letters 117.24 (2020).

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