Near-Field Optical Flying Head with Protruding Aperture and Its Fabrication

Hirata, Masakazu; Oumi, Manabu; Nakajima, Kunio; Ohkubo, T.

doi:10.1143/jjap.44.3519

Cited by 11 publications

(8 citation statements)

References 9 publications

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“…Distance from aperture (nm) Our NF optical flying head has compact light guide structure using a horizontally placed optical fiber and micro optics 8) . This structure enables NF head with optics to be installed in HDD.…”

Section: Nf Spot Size (Fwhm) (Nm)mentioning

confidence: 99%

Near-Field Optical Flying Head with A Triangular Aperture

et al. 2008

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Heat assisted magnetic recording head needs near-field element as a micro heat generator and light guide structure. We have proposed a triangular aperture as a near-filed element. Computer simulation using finite difference time domain (FDTD) method shows that the triangular aperture has a near-field peak on the edge perpendicular to the polarization of the incident light. Therefore it achieves a near-field spot less than 20 nm (FWHM) in the direction of the polarization, which is not limited by the aperture size. SNOM and contact slider experiments in the previous study also show that the triangular aperture is effective. We have also proposed a compact light guide structure with an optical fiber. Using light guide structure with a polarization maintaining fiber and micro optics can achieve a thin and small (1.6x1.6x0.7 mm) near-field flying head. The head was fabricated. Signal readout was demonstrated in flying operation. It could read 300 nm L&S patterns.

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Section: Nf Spot Size (Fwhm) (Nm)mentioning

confidence: 99%

Near-Field Optical Flying Head with A Triangular Aperture

et al. 2008

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“…As was mentioned above, the superior performance of a triangular aperture can be demonstrated only on the condition that aperture-to-medium spacing would be relatively small (approximately \20 nm). Hence, we introduced a protruded aperture structure which could lessen apertureto-medium spacing by approximately 20 nm utilizing nano-step lithography technology (Hirata et al 2005a). In order to improve the slider's surface-following ability at lower spacing, we also adopted a thin 0.3-mm-thick slider core substrate made of transparent quartz, suppressing the inertial moment of the flying head slider.…”

Section: Introductionmentioning

confidence: 99%

Sub-100-nm ROM pattern readout using a triangular protruded aperture mounted optical head slider

et al. 2009

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The continual advancement of the digital network society demands higher density and higher data transfer rates for all sorts of data storage. Optical memory based on the ''near-field'' principle is considered one of the most promising ones because it has no apparent physical density limit such as that due to the thermal instability encountered in magnetic recording. In light of this, we have previously demonstrated the superior readout performance of an optical head slider which is mounted on a non-circular aperture, specifically a triangular aperture having a bottom side size of 330 nm irradiated by polarized light, with this scheme indicating a clear signal response corresponding to a 70-nm-long single slit pattern. In order to fully realize the superior potential of the triangular aperture's high spatial resolution and high signal output, it is essential to minimize aperture-to-medium spacing. In this paper, we introduce a protruded aperture mounted on a 1.5-mm-long miniaturized optical head slider whose aperture protrudes approximately 20 nm from an air-bearing surface level based on nano-step lithography technology. Utilizing a triangular aperture of 140 nm per side, a readout experiment was carefully performed at an aperture-to-medium spacing down to approximately 30 nm, corresponding to a circumferential velocity of 2.18 m/s. The influence of the incident light's polarization direction (in relation to the bottom side of the triangular aperture) on the readout signals was evaluated by flying the aperture above a chromium patterned medium having single-space or lineand-space patterns whose line lengths ranged from 300 to 50 nm.

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“…Near-field optical technique has been proposed to overcome the diffraction limit 2) . In order to realize the practical storage devices, a near-field optical head with flying-head slider has been proposed [3][4][5] . On the other hand, nano-patterned medium, in which the recording layer is constructed using many small patterns with the size of a single bit, is one of the solutions for high density recording 6) .…”

Section: Introductionmentioning

confidence: 99%

Optical and Thermal Analysis of Nano-Patterned Medium Structure for Near-Field Assisted Recording Using FDTD Method

et al. 2008

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Simulation of near-field assisted recording using the finite-difference time-domain (FDTD) method and thermal analysis was carried out. Improvement of optical coupling efficiency between nano-patterned medium and optical near-field probe is the most important issue to design and optimize heat assisted near-field magnetic recording system. We propose the new nano-patterned medium structure that constructs the multi layer structure of silver and magnetic recording material. Local plasmon enhancement of silver layer is effective in order to improve optical near-field coupling efficiency of nano-patterned medium. The generated heat at silver layer conducts into magnetic recording material layer.

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Near-Field Optical Flying Head with Protruding Aperture and Its Fabrication

Cited by 11 publications

References 9 publications

Near-Field Optical Flying Head with A Triangular Aperture

Near-Field Optical Flying Head with A Triangular Aperture

Sub-100-nm ROM pattern readout using a triangular protruded aperture mounted optical head slider

Optical and Thermal Analysis of Nano-Patterned Medium Structure for Near-Field Assisted Recording Using FDTD Method

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