Optical TAMR Head Design for Placing a Heating Spot Close to a Magnetic Pole

Osawa, Kazuhito; Sekine, K.; Saka, M.; Nishida, Naoki; Hatano, Hiroshi

doi:10.3379/msjmag.0908mc0003

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…This is achieved by several approaches including: 1) making the structure resonant at a particular wavelength; 2) utilizing the "lightning rod" effect, which essentially relies on the fact that the electric field concentrates along the sharp tips or notches in the geometric design; and 3) by efficient use of an image dipole. 13,14) Some functional NFT designs include the triangular antenna, 13,15) E antenna, 16) lollipop structure, 17) bowtie aperture, 18,19) C-aperture, 20,21) and nanobeak antenna. 22,23) Increasing the efficiency of the coupling of the incident laser power to the recording medium is one of the primary goals in designing a better NFT.…”

Section: Introductionmentioning

confidence: 99%

Optical and thermal designs of near field transducer for heat assisted magnetic recording

Datta¹,

Xu²

2018

Jpn. J. Appl. Phys.

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Heat assisted magnetic recording (HAMR) is considered one of the new generation hard drive recording technologies for increasing the data storage density. At its core, HAMR devices are dependent on plasmonic nano antennas, called near field transducers (NFT) to locally deliver heat to storage media. Hence, the design of NFT is crucial for an optimized HAMR device. Several types of NFT designs have been studied through optical and thermal simulations and are quantified using appropriate figures of merit. In addition, the possibility of exciting NFTs at a longer wavelength (1550 nm) has been studied, and it is found that there is a significant improvement of the thermal performance. The effect of having tapers in the geometry of the NFT and their role in improving the NFT thermal performance are also discussed. These studies point to different directions that performance of NFT can be improved.

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Section: Introductionmentioning

confidence: 99%

Optical and thermal designs of near field transducer for heat assisted magnetic recording

Datta¹,

Xu²

2018

Jpn. J. Appl. Phys.

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“…The dimensions of both the resonator and the sharp feature need to be optimized to achieve the best energy coupling efficiency. Common designs include triangle antenna [28,29] and triangle aperture [30,31], C aperture [32][33][34][35][36], bowtie antenna [37][38][39][40] and bowtie aperture [15,23,[41][42][43][44].…”

Section: Figure 3 (A)mentioning

confidence: 99%

Plasmonic near-field transducer for heat-assisted magnetic recording

Zhou

Hammack³

et al. 2014

Nanophotonics

136

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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-diffractionlimited 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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Numerical investigation of a light delivery device using metal/insulator/metal with a 3D linear taper waveguide and an input grating for heat-assisted magnetic recording

Wongpanya

Pijitrojana

2021

Appl. Opt.

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Heat-assisted magnetic recording (HAMR), a new technique, we believe, to overcome the data-density limitation, uses a laser to temporarily heat a nanovolume of a recording medium. Thus, this paper proposes a light delivery device that uses the metal/insulator/metal waveguide with a three-dimensional linear taper, and a grating added for an input, for HAMR. Our structure was calculated by finite-element method simulation. By design, 830 nm of light was delivered into a 50 n m 2 spot area with 63% coupling efficiency, and power intensity was enhanced 930 times. This achievement potential could be applied to the HAMR system in the future.

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Optical TAMR Head Design for Placing a Heating Spot Close to a Magnetic Pole

Cited by 3 publications

References 9 publications

Optical and thermal designs of near field transducer for heat assisted magnetic recording

Optical and thermal designs of near field transducer for heat assisted magnetic recording

Plasmonic near-field transducer for heat-assisted magnetic recording

Numerical investigation of a light delivery device using metal/insulator/metal with a 3D linear taper waveguide and an input grating for heat-assisted magnetic recording

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