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

0541007 - FZÚ 2021 RIV US eng J - Journal Article
Ross, A. - Lebrun, R. - Baldrati, L. - Kamra, A. - Gomonay, O. - Ding, S. - Schreiber, F. - Backes, D. - Maccherozzi, F. - Grave, D.A. - Rothschild, A. - Sinova, Jairo - Klaeui, M.
An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit.
Applied Physics Letters. Roč. 117, č. 24 (2020), s. 1-6, č. článku 242405. ISSN 0003-6951. E-ISSN 1077-3118
Institutional support: RVO:68378271
Keywords : SQUID * AFM hematite (a-Fe2O3) * spin conduit * antiferromagnetic (AFM) spintronics
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.791, year: 2020
Method of publishing: Limited access
https://doi.org/10.1063/5.0032940

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.

Permanent Link: http://hdl.handle.net/11104/0318581