Optical, thermal, and bit-writing analysis of a directly coupled plasmonic waveguide for heat-assisted magnetic recording

Bello, Frank, Wolf, Daniel, Parker, Gregory J., Wolf, Christopher, Krichevsky, Alexander, Zong, Fenghua, Abadia, Nicolas ORCID: https://orcid.org/0000-0002-7355-4245 and Donegan, John F. 2020. Optical, thermal, and bit-writing analysis of a directly coupled plasmonic waveguide for heat-assisted magnetic recording. OSA Continuum 3 (8) , pp. 2010-2021. 10.1364/OSAC.396439

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Abstract

We investigate the energy conversion process and subsequent thermal and bit-writing performance of a plasmonic near-field transducer (NFT) under steady-state operation within heat-assisted magnetic recording (HAMR) devices. The NFT is composed of metal-insulator-metal (MIM) layers that are designed to localize heating and produce optimal thermal gradients in order to relieve parasitic heating effects in the NFT. The thin-film MIM structure confines the electromagnetic energy in the down-track direction while cross-track confinement is achieved by tapering the insulator feature of the MIM. A comparative analysis using Gold and a number of novel Au alloys is undertaken. Modeled performance shows excellent thermal spot confinement (50 × 50 nm2) of temperatures above 650 K at an input laser power of 830 nm of less than 5 milliwatts. In addition, micromagnetic simulations using a stochastic Landau-Lifshitz-Bloch equation yield excellent signal to noise ratio with minimum jitter of under 2 nm when recording.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Optical Society of America
ISSN:	2578-7519
Date of First Compliant Deposit:	29 July 2021
Date of Acceptance:	3 July 2020
Last Modified:	04 May 2023 22:36
URI:	https://orca.cardiff.ac.uk/id/eprint/143021

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