Optical, thermal, and bit-writing analysis of a directly coupled plasmonic waveguide for heat-assisted magnetic recording
Citation:
Frank Bello, Daniel Wolf, Gregory J. Parker, Christopher Wolf, Alexander Krichevsky, Fenghua Zong, Nicolás Abadía, and John F. Donegan, "Optical, thermal, and bit-writing analysis of a directly coupled plasmonic waveguide for heat-assisted magnetic recording," OSA Continuum, 2020, 3, 2010-2021Download Item:
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
Sponsor
Grant Number
Science Foundation Ireland
12/RC/2278
Author's Homepage:
http://people.tcd.ie/jdonegan
Author: Donegan, John
Type of material:
Journal ArticleCollections
Series/Report no:
OSA Continuum;3;
8;
Availability:
Full text availableKeywords:
plasmonic near-field transducer (NFT), metal-insulator-metal (MIM), Landau-Lifshitz-Bloch equationDOI:
http://dx.doi.org/10.1364/OSAC.396439Metadata
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