Tribological behavior of rigid disks with high density micro cone-shaped projections

Kozu, J.; Kuriyama, Toshihiko; Seo, Yongho; Arita, Yoshihiko; Yokoyama, Fumihiko

doi:10.1109/20.538830

Cited by 8 publications

(4 citation statements)

References 4 publications

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“…Diode pumped Nd:YLF and Nd:YAG pulsed lasers with repetition rates less than 10 KHz become good candidates for making sombrero bumps. On the other hand, crater bumps and dome shaped bumps [5] require less power and longer pulse widths which allow different laser sources to be used, such as Nd:YVO 4 (vanadate)and modulated CW green lasers. In these applications, the laser repetition rate can be above 100 KHz giving a high throughput.…”

Section: Laser Texture Technologymentioning

confidence: 99%

“…To achieve these goals, the bump shape, height, and density have to be optimized. Earlier works have demonstrated that acceptable tribological performance can be achieved by using various bump shapes, such as crater bumps [6], sombrero bumps [2], W-type bumps [7], and "Micro-cone" bumps [5], with proper bump height, diameter and spacing arrangement. Several stiction models for laser texture are available that successfully predict stiction performance [8].…”

Section: Tribology Optimization Of Lzt Designsmentioning

confidence: 99%

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Current and future approaches for laser texturing of thin film media

Liu¹,

Li²,

Johnson³

2000

IEEE Trans. Magn.

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Laser zone texture technology is widely used to enhance the tribological performance of high areal density media. A review of laser texture design approaches with stiction modeling and contact stress analysis is presented. Criteria developed for optimizing sombrero and crater bump designs for NiP/Al substrates and spherical bump designs for glass and glass-ceramic substrates are introduced. Manufac-turability issues in maintaining bump height control for both NiP/Al and alternative substrates are presented. The extendibility of laser texture technology to meet the requirements of magnetic designs in excess of 10 Gb/in 2 is discussed.Index Terms-Laser texture, head-media interface, tribology.

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Section: Laser Texture Technologymentioning

confidence: 99%

Section: Tribology Optimization Of Lzt Designsmentioning

confidence: 99%

Current and future approaches for laser texturing of thin film media

Liu¹,

Li²,

Johnson³

2000

IEEE Trans. Magn.

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“…Surface texturing techniques have been applied to modify the topographic features of the contacting surfaces to improve tribological performances [21][22][23][24][25][26][27][28][29][30][31][32][33]. These include: reduction of friction [21][22][23][24][25][26], entrapment of wear particles [21,22,27], and decrease stiction [28][29][30][31][32]. Tian et al [21] have shown that undulated steel and titanium surfaces (textured grooves) can significantly lower friction in a series of linear reciprocating wear experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Oktay et al [27] further suggested that the textured surfaces could prevent agglomeration of the wear particles. In the computer hard disk application, surface bumps have been used to reduce stiction [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Surface Texture Design to Generate Specific Sizes and Shapes of UHMWPE Wear Particles

Fang

Hsu

Sengers

2003

Materialwissenschaft Werkst

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Osteolysis induced by UHMWPE wear particles has emerged as the critical failure mechanism of artificial joints. However, the detailed mechanism of osteolysis and bone resoprtion induced by wear particles leading to the loosening of the total joint replacement is still not clear. To investigate the effects of size and shape of particles on biological response, particles with controlled size and shape are needed. The paper describes a novel technique where controlled size and shape of UHMWPE wear particles can be generated through rubbing against a textured surface.The basic principles of surface texturing to generate different size and shape of wear particles through rubbing have been developed. The surface features are fabricated through conventional semiconductor microfabrication techniques. Various designs were attempted and the results suggested that micro-cutting mechanisms of a visco-elastic material are complex but can be controlled through three dimensional surface features. Specific length of UHMWPE particles can be generated by controlling the cuttingedge length of a surface wedge. The particle width can be controlled by the cutting-edge height, normal load, and the sliding speed. With appropriate surface-texture design, UHMWPE particles can be generated with desired sizes and shapes.Keywords: UHMWPE, wear particles, surface texturing, microfabrication, size, shape, density, pitch, patterns, design

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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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Tribological behavior of rigid disks with high density micro cone-shaped projections

Cited by 8 publications

References 4 publications

Current and future approaches for laser texturing of thin film media

Current and future approaches for laser texturing of thin film media

Surface Texture Design to Generate Specific Sizes and Shapes of UHMWPE Wear Particles

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

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