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.
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14 December 2020
Research Article|
December 15 2020
An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit
Andrew Ross
;
Andrew Ross
1
Institute of Physics, Johannes Gutenberg-University Mainz
, 55099 Mainz, Germany
2
Graduate School of Excellence Materials Science in Mainz
, Staudingerweg 7, 55128 Mainz, Germany
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Romain Lebrun
;
Romain Lebrun
1
Institute of Physics, Johannes Gutenberg-University Mainz
, 55099 Mainz, Germany
3
Unité Mixte de Physique CNRS, Thales, University Paris-Sud, Université Paris-Saclay
, Palaiseau 91767, France
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Lorenzo Baldrati
;
Lorenzo Baldrati
1
Institute of Physics, Johannes Gutenberg-University Mainz
, 55099 Mainz, Germany
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Akashdeep Kamra
;
Akashdeep Kamra
4
Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology
, NO-7491 Trondheim, Norway
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Olena Gomonay
;
Olena Gomonay
1
Institute of Physics, Johannes Gutenberg-University Mainz
, 55099 Mainz, Germany
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Shilei Ding
;
Shilei Ding
1
Institute of Physics, Johannes Gutenberg-University Mainz
, 55099 Mainz, Germany
2
Graduate School of Excellence Materials Science in Mainz
, Staudingerweg 7, 55128 Mainz, Germany
5
State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University
, Beijing 100871, China
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Felix Schreiber;
Felix Schreiber
1
Institute of Physics, Johannes Gutenberg-University Mainz
, 55099 Mainz, Germany
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Dirk Backes
;
Dirk Backes
6
Diamond Light Source
, Didcot, Oxfordshire OX11 0DE, United Kingdom
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Francesco Maccherozzi;
Francesco Maccherozzi
6
Diamond Light Source
, Didcot, Oxfordshire OX11 0DE, United Kingdom
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Daniel A. Grave;
Daniel A. Grave
7
Department of Materials Engineering and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev
, Beer-Sheva 8410501, Israel
8
Department of Materials Science and Engineering, Technion-Israel Institute of Technology
, Haifa 32000, Israel
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Avner Rothschild
;
Avner Rothschild
8
Department of Materials Science and Engineering, Technion-Israel Institute of Technology
, Haifa 32000, Israel
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Jairo Sinova;
Jairo Sinova
1
Institute of Physics, Johannes Gutenberg-University Mainz
, 55099 Mainz, Germany
9
Institute of Physics ASCR
, v.v.i., Cukrovarnicka 10, 162 53 Praha 6, Czech Republic
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Mathias Kläui
Mathias Kläui
a)
1
Institute of Physics, Johannes Gutenberg-University Mainz
, 55099 Mainz, Germany
2
Graduate School of Excellence Materials Science in Mainz
, Staudingerweg 7, 55128 Mainz, Germany
4
Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology
, NO-7491 Trondheim, Norway
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 117, 242405 (2020)
Article history
Received:
October 12 2020
Accepted:
November 23 2020
Citation
Andrew Ross, Romain Lebrun, Lorenzo Baldrati, Akashdeep Kamra, Olena Gomonay, Shilei Ding, Felix Schreiber, Dirk Backes, Francesco Maccherozzi, Daniel A. Grave, Avner Rothschild, Jairo Sinova, Mathias Kläui; An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit. Appl. Phys. Lett. 14 December 2020; 117 (24): 242405. https://doi.org/10.1063/5.0032940
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