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Parity-controlled spin-wave excitations in synthetic antiferromagnets

Sud, A; Koike, Y; Iihama, S; Zollitsch, C; Mizukami, S; Kurebayashi, H; (2021) Parity-controlled spin-wave excitations in synthetic antiferromagnets. Applied Physics Letters , 118 (3) , Article 032403. 10.1063/5.0037427. Green open access

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Abstract

We report in this study the current-induced-torque excitation of acoustic and optical modes in Ta/NiFe/Ru/NiFe/Ta synthetic antiferromagnet stacks grown on SiO2/Si substrates. The two Ta layers serve as spin torque sources with the opposite polarizations in both spin currents and Oersted fields acting on their adjacent NiFe layers. This can create the odd symmetry of spatial spin torque distribution across the growth direction, allowing us to observe different spin-wave excitation efficiency from synthetic antiferromagnets excited by homogeneous torques. We analyze the torque symmetry by the in-plane angular dependence of symmetric and anti-symmetric line shape amplitudes for their resonance and confirm the parallel (perpendicular) pumping nature for the acoustic (optical) modes in our devices, which is in stark contrast to the modes excited by spatially homogeneous torques. We also present our macrospin model for this particular spin-torque excitation geometry, which excellently supports our experimental observation. Our results offer capability of controlling spinwave excitations by local spin-torque sources, and we can explore further spin-wave control schemes based on this concept.

Type: Article
Title: Parity-controlled spin-wave excitations in synthetic antiferromagnets
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/5.0037427
Publisher version: http://doi.org/10.1063/5.0037427
Language: English
Additional information: Copyright 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10123127
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