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

DOI: 10.1063/5.0032940 DOI Help

Authors: Andrew Ross (Johannes Gutenberg-Universitat Mainz; Graduate School of Excellence Materials Science in Mainz) , Romain Lebrun (Johannes Gutenberg-University Mainz; Unité Mixte de Physique CNRS, Thales, University Paris-Sud, Université Paris-Saclay) , Lorenzo Baldrati (Johannes Gutenberg-Universitat Mainz) , Akashdeep Kamra (Norwegian University of Science and Technology) , Olena Gomonay (Johannes Gutenberg-University Mainz) , Shilei Ding (Johannes Gutenberg-University Mainz; Graduate School of Excellence Materials Science in Mainz; Peking University) , Felix Schreiber (Johannes Gutenberg-Universitat Mainz) , Dirk Backes (Diamond Light Source) , Francesco Maccherozzi (Diamond Light Source) , Daniel A. Grave (Ben-Gurion University of the Negev; Technion-Israel Institute of Technology) , Avner Rothschild (Technion-Israel Institute of Technology) , Jairo Sinova (Johannes Gutenberg-University Mainz; Institute of Physics ASCR) , Mathias Klaui (Johannes Gutenberg-University Mainz; Graduate School of Excellence Materials Science in Mainz; Norwegian University of Science and Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Physics Letters , VOL 117

State: Published (Approved)
Published: December 2020
Diamond Proposal Number(s): 23819

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.

Journal Keywords: Doping; Magnetic ordering; Magnons; Spin angular momentum; Magnetic anisotropy; Transport properties; Thin films

Diamond Keywords: Spintronics

Subject Areas: Materials, Physics

Instruments: I06-Nanoscience

Discipline Tags:

Material Sciences Quantum Materials Multiferroics Physics Hard condensed matter - electronic properties Magnetism Surfaces interfaces and thin films

Technical Tags:

Spectroscopy Circular Dichroism (CD) X-ray Absorption Spectroscopy (XAS) X-ray Magnetic Circular Dichroism (XMCD)