Manufacturability of advanced laser texture designs [magnetic disks]

Liu, Jia Jay; Li, Wenjun; Johnson, Kenneth E.

doi:10.1109/20.706708

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…The total lateral size of the feature (including the surrounding depression) along the minor axis of the ellipse is 12.4 μm, which is 3 μm larger than the 6 nm high elliptical bump reported earlier. This might be explained by the defocusing offset used during the experiments to attain a lower bump height [18].…”

Section: Resultsmentioning

confidence: 99%

Laser generation of elliptical nanometre and sub-nanometre bump arrays on NiP/Al data storage disks and their effect on stiction performance

Peña

Wang

J³

et al. 2011

Nanotechnology

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Elliptical nano-bumps on nickel-phosphorus coated aluminium (NiP/Al) hard disks were fabricated by a laser texturing system (maximum power 8 W, maximum frequency 300 kHz). By carefully selecting the level of laser power attenuation and defocus offset distance, bump height can be controlled below 6 nm and down to the sub-nanometre scale. This type of laser-induced texture (elliptical shape) on a disk surface is expected to provide better control of the stiction force along with the smallest separation distance between the head slider and the disk. Quantitative modelling based on the classical Hertzian theory for elliptic contacts has been carried out with the purpose of predicting the stiction behaviour of the presented elliptical shaped sub-10 nm bumps. It has been found that an elliptical shape not only reduces the overall stiction performance of the laser texturing zone (LZT) compared to the conventional circular shape but also extends the occurrence of the 'stiction wall' towards the sub-10 nm regime for ultra-low-glide applications.

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Section: Resultsmentioning

confidence: 99%

Laser generation of elliptical nanometre and sub-nanometre bump arrays on NiP/Al data storage disks and their effect on stiction performance

Peña

Wang

J³

et al. 2011

Nanotechnology

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Production and characterization of asymmetric laser-textured bumps for magnetic media

Krumbuegel¹,

Yang²

2000

Journal of Applied Physics

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Asymmetric “S-shaped” bumps are formed in the presence of a significant temperature gradient on the disk surface during the laser-texture process. The production of S-shaped bumps is of particular interest for low-glide magnetic media, for which the desired high bump densities require the use of high spindle speeds. The formation of S-shaped bumps as a function of laser-pulse energy (0.1–4.5 μJ), pulse width (350–5000 ns), and rotation speed of the spindle (1184–4737 rpm) was investigated. The results show that within the accessible energy range the peak-to-mean bump height increases with the pulse energy. For a constant pulse energy, larger bump heights are obtained for shorter pulse widths. In addition, higher bumps are also obtained for slower spindle speeds if the pulse width is 2000 ns or longer, but this changes as the pulse width is reduced. The full-width-at-half-maximum diameter of the trailing bump cone monotonically increases with the pulse energy for 350–1000 ns pulse width, but shows a local minimum for 2000 and 5000 ns pulse width, which is shifted to smaller pulse energies as the spindle speed is reduced. An investigation of the height shrinkage during the sputter process showed that the shrinkage is larger for 15 nm high bumps textured with 500 ns pulse width and 0.26 μJ pulse energy than for bumps of the about the same height textured with 1000 ns pulse width and 0.40 μJ pulse energy.

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