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Development of contact sliders with nanotextures by femtosecond laser processing

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This paper describes the development of novel contact sliders with nanotextures by means of femtosecond laser processing. In order to achieve a magnetic recording density of more than 1 Tb/in2, it is necessary to create an ultralow head-disk interface (HDI) spacing, i.e., less than 2–3 nm. Thus far, various new concept HDI technologies have been proposed for developing such near-contact or contact recording HDI. In this paper, the authors propose the concept of a novel contact slider. This slider has nanotextures fabricated by femtosecond laser processing. Sliders with five DLC thin-film pads on the air bearing surfaces were used, and the pad diameter and thickness are 40 μm and 40 nm, respectively. The fabrication process of nanotextures on the DLC thin-film pads employed a femtosecond Ti:sapphire laser. The laser wavelength and pulse width are 800 nm and 120 fs, respectively. Contact slider experiments were also carried out, using (1) the fabricated contact sliders having nanotextures with different RMS heights and (2) a contact slider without nanotextures. The nanotribological characteristics of the contact HDI as well as the dynamics of the contact sliders were investigated. In addition, the behavior of the ultrathin liquid lubricant film was evaluated by using a surface reflectance analyzer (SRA) after the contact slider experiments. It was found that the nanotextures produced by femtosecond laser processing are very effective for next-generation contact sliders and the optimum RMS heights of the nanotextures can be obtained. These advancements will facilitate the development of contact HDI with lower friction, lower wear of the contact slider surfaces, smaller change in the lubricant film thickness and lower contact slider bouncing vibration.

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Acknowledgments

This research was supported in part by a project of the High Technology Research Center of Kansai University, titled “The development of innovative nanotechnology for the Tbit/in2 class ultrahigh-recording-density information storage systems for supporting a ubiquitous society.”

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Authors and Affiliations

  1. Department of Mechanical Engineering, High Technology Research Center, Kansai University, Suita-shi, Osaka, 564-8680, Japan

    N. Tagawa

  2. Graduate School of Engineering, Kansai University, presently at NIDEC Corporation, Suita-shi, Osaka, 564-8680, Japan

    M. Takada

  3. Kansai University, Suita-shi, Osaka, 564-8680, Japan

    A. Mori

  4. Canon Machinery Corporation, Kusatsu, Siga, 525-8511, Japan

    H. Sawada & K. Kawahara

Authors
  1. N. Tagawa
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  2. M. Takada
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  3. A. Mori
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  4. H. Sawada
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  5. K. Kawahara
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Corresponding author

Correspondence to N. Tagawa.

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Tagawa, N., Takada, M., Mori, A. et al. Development of contact sliders with nanotextures by femtosecond laser processing. Tribol Lett 24, 143–149 (2006). https://doi.org/10.1007/s11249-006-9142-4

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  • DOI: https://doi.org/10.1007/s11249-006-9142-4

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