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Observation of coherent spin waves in a three-dimensional artificial spin ice structure

Sahoo, Sourav, May, Andrew, van Den Berg, Arjen, Mondal, Amrit Kumar, Ladak, Sam and Barman, Anjan 2021. Observation of coherent spin waves in a three-dimensional artificial spin ice structure. Nano Letters 21 (11) , pp. 4629-4635. 10.1021/acs.nanolett.1c00650

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Abstract

Harnessing high-frequency spin dynamics in three-dimensional (3D) nanostructures may lead to paradigm-shifting, next-generation devices including high density spintronics and neuromorphic systems. Despite remarkable progress in fabrication, the measurement and interpretation of spin dynamics in complex 3D structures remain exceptionally challenging. Here, we take a first step and measure coherent spin waves within a 3D artificial spin ice (ASI) structure using Brillouin light scattering. The 3D-ASI was fabricated by using a combination of two-photon lithography and thermal evaporation. Two spin-wave modes were observed in the experiment whose frequencies showed nearly monotonic variation with the applied field strength. Numerical simulations qualitatively reproduced the observed modes. The simulated mode profiles revealed the collective nature of the modes extending throughout the complex network of nanowires while showing spatial quantization with varying mode quantization numbers. The study shows a well-defined means to explore high-frequency spin dynamics in complex 3D spintronic and magnonic structures.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Chemical Society
ISSN: 1530-6984
Funders: EPRSC
Date of First Compliant Deposit: 2 June 2021
Date of Acceptance: 21 May 2021
Last Modified: 11 Jun 2021 11:56
URI: http://orca.cardiff.ac.uk/id/eprint/141667

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