Authors:	Ross, Andrew Lebrun, Romain Baldrati, Lorenzo Kamra, Akashdeep Gomonay, Olena Ding, Shilei Schreiber, Felix Backes, Dirk Maccherozzi, Francesco Grave, Daniel A. Rothschild, Avner Sinova, Jairo Kläui, Mathias
Title:	An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit
Online publication date:	12-Jan-2021
Year of first publication:	2020
Language:	english
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 mu m, and magnetic domain governed decay lengths of 175nm 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. Published under license by AIP Publishing.
DDC:	530 Physik 530 Physics
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 08 Physik, Mathematik u. Informatik
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-5547
Version:	Accepted version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	In Copyright
Information on rights of use:	https://rightsstatements.org/page/InC/1.0/?language=en
Journal:	Applied physics letters 117 24
Pages or article number:	242405
Publisher:	American Inst. of Physics
Publisher place:	Melville, NY
Issue date:	2020
ISSN:	0003-6951
Publisher URL:	https://doi.org/10.1063/5.0032940
Publisher DOI:	10.1063/5.0032940
Appears in collections:	JGU-Publikationen