Journal
NANOPHOTONICS
Volume 3, Issue 3, Pages 141-155Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2014-0001
Keywords
field confinement; field enhancement; heat-assisted magnetic recording; low loss materials; near field transducer; optical antenna; plasmonics
Categories
Funding
- Defense Advanced Research Projects Agency [N66001-08-1-2037]
- National Science Foundation [CMMI-1120577]
- Advanced Storage Technology Consortium (ASTC)
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1120577] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Industrial Innovation & Partnersh [1311972] Funding Source: National Science Foundation
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Plasmonic devices, made of apertures or antennas, have played significant roles in advancing the fields of optics and opto-electronics by offering subwavelength manipulation of light in the visible and near infrared frequencies. The development of heat-assisted magnetic recording (HAMR) opens up a new application of plasmonic nanostructures, where they act as near field transducers (NFTs) to locally and temporally heat a sub-diffraction-limited region in the recording medium above its Curie temperature to reduce the magnetic coercivity. This allows use of very small grain volume in the medium while still maintaining data thermal stability, and increasing storage density in the next generation hard disk drives (HDDs). In this paper, we review different plasmonic NFT designs that are promising to be applied in HAMR. We focus on the mechanisms contributing to the coupling and confinement of optical energy. We also illustrate the self-heating issue in NFT materials associated with the generation of a confined optical spot, which could result in degradation of performance and failure of components. The possibility of using alternative plasmonic materials will be discussed.
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