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Elliptical plasmonic near-field transducer and v-shape waveguide designs for heat assisted magnetic recording

Ali, Mugahid, Bello, Frank, Abadia Calvo, Nicolas ORCID:, Huang, Fumin and Donegan, John 2022. Elliptical plasmonic near-field transducer and v-shape waveguide designs for heat assisted magnetic recording. Optics Continuum 1 (7) , pp. 1529-1541. 10.1364/OPTCON.460036

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We proposed a new elliptical near-field transducer (NFT) and V-shaped waveguide design, which provides multiple pathways to control and optimise the thermal performance of the optical delivery paths for heat-assisted magnetic recording (HAMR). The principle of operation of the design utilises the properties of the localised surface plasmon resonance (LSPR) of the metallic elliptical NFT. We demonstrated a peak temperature in the recording media normalised to the incident laser power (TMedia/PIn) ranging from ∼ 128 K/mW to more than 181 K/mW. We also achieved tunable thermal gradients as high as 23.0 K/nm and 18.7 K/nm in the recording media’s down-track and cross-track directions, respectively. Moreover, we exemplified that the inevitable temperature rise in the plasmonic NFT could be tuned to remain under 400 K for maximum heat in the recording media > 700 K. The best thermal performance obtained corresponded to the aspect ratio of the antenna a/b ∼ 0.89 with the minor axis of the antenna a = 85 nm.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Additional Information: Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
ISSN: 2770-0208
Date of First Compliant Deposit: 24 August 2022
Date of Acceptance: 13 June 2022
Last Modified: 10 Nov 2022 11:50

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