Burnishing Heads In-Drive for Higher Density Recording

Strom, Brian; Deits, S.; Gerber, Carri; Krajnovich, D.; Ohlsen, D.; Turner, Richard

doi:10.1109/tmag.2003.821155

Cited by 12 publications

(4 citation statements)

References 4 publications

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“…(In contact recording, the recording head needs to run in continuous contact with the disk for many years with negligible wear.) Recently, however, an initial burnishing phase has been proposed for removing the head overcoat and head recession as a way of achieving the very small spacing needed between the disk magnetic media and the read and write sensors in the head for 1 Terabit/in 2 recording densities [4,9,30], indicating the need to better understand and control the wear processes at contacting slider-disk interfaces.…”

Section: Insight Into Wear At Slider-disk Interfacesmentioning

confidence: 99%

“…Several techniques have been introduced to reduce the contact area of these low flying slider-disk interfaces in an effort to reduce friction: texturing air-bearing surface (ABS) [6][7][8], adding small contact pads on the slider surface [4,9], and texturing to the disk surface. While these techniques reduce friction substantially, further reduction is needed to ensure that occasional contacts do not have a detrimental impact on disk drive operations.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and theoretical evaluation of friction at contacting magnetic storage slider–disk interfaces

et al. 2006

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To understand better the friction force and wear processes at contacting slider-disk interfaces, we have developed an experimental method for measuring and a theoretical method for calculating the friction force. For this study, a slider with a 1500 lm 2 contact pad located at the recording head is burnished against a relatively rough disk ( $ 12 Å rms), which ensures smooth sliding. In the experimental method, the friction force is measured as the disk is spun-down to bring the slider-disk interface into an increasing degree of contact. A modified air bearing code is used to determine the experimental normal contact force for each friction measurement. In the theoretical method, the friction force and other relevant interfacial forces are calculated using an improved sub-boundary lubrication (ISBL) rough surface model. The friction force calculation in this model is based on the force needed to induce yielding of the individual disk asperities contacting the flat surface of the contact pad without any assumption of the coefficient of friction. Good agreement is found between the measured and theoretical friction vs. normal contact force curves, indicating that the model is capturing the essential origins of friction at this interface. The model also provides valuable insights into how wear particles may be generated at this contacting slider-disk interface.

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Section: Insight Into Wear At Slider-disk Interfacesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical evaluation of friction at contacting magnetic storage slider–disk interfaces

et al. 2006

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“…One post-slider fabrication process to reduce ABS was introduced by Strom et al (2004). The process is basically a burnishing technique to wear off the DLC coating of a slider's trailing pad that houses the read/write element, using the disk surface.…”

Section: Introductionmentioning

confidence: 99%

Slider surface control for ultra-high density recording

et al. 2009

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Ultra-high density magnetic recording requires very low head-media physical spacing of less than 5 nm. The surface morphologies of the slider's air-bearing surface (ABS) and the magnetic media surface are key limiting parameters to achieve this spacing requirement and therefore need to be further improved. For slider's ABS, further reduction in surface roughness means further optimization of the nanogrinding process. This paper presents an experimental study to reduce ABS roughness in the nanogrinding process with fine diamond abrasives that are 50 nm in size. Average roughness (R a ) of approximately 0.2 and 0.3 nm was achieved for Al 2 O 3 and AlTiC portions of the ABS, respectively. Nanogrinding process parameters, such as load and speed did not affect the minimum ABS roughness significantly. However, the load applied affected the time required to attain the minimum roughness value.

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“…Khurshudov and Tyndall 3 and Khurshudov and Raman 4 defined and characterized the head-disk clearance and discussed the roughness effects on head-disk interface durability and reliability. In order to remove the excess thermal pole tip of heads and increase the head-disk clearance, media burnish capabilities have been investigated [5][6][7] . Kawakubo 8 studied the effect of tape-burnish on reducing asperity height by pin-on-disk tests and concluded that tape-burnish is good technique for reducing head wear and should be further studied to increase the asperity height-reduction efficiency while maintaining disk surface quality.…”

Section: Introductionmentioning

confidence: 99%

Optimizing tape‐burnishing/wiping process of magnetic recording media through Taguchi method

Zhao

Piramanayagam

et al. 2008

Quality & Reliability Eng

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For the ever-increasing recording density in hard disk drives, ultra-low gliding height media are required. It is an immense challenge for the tape-burnishing/wiping process of media to reduce the asperities effectively and efficiently while no scratches occur. The purpose of this paper is to characterize and then optimize the tapeburnishing/wiping process as so to minimize the asperities without leaving any scratches on the media surface. A Taguchi experiment design method is adopted to analyze the data and acquire an optimal level combination of process parameters. The resulting optimal combination is practically implemented in tape-burnishing/wiping the several magnetic recording media, which reveals that the average pass ratio of 5 nm glide avalanche testing increases nearly doubly to a level of 96%.

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Burnishing Heads In-Drive for Higher Density Recording

Cited by 12 publications

References 4 publications

Experimental and theoretical evaluation of friction at contacting magnetic storage slider–disk interfaces

Experimental and theoretical evaluation of friction at contacting magnetic storage slider–disk interfaces

Slider surface control for ultra-high density recording

Optimizing tape‐burnishing/wiping process of magnetic recording media through Taguchi method

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