Time evolution of lubricant-slider dynamic interactions

Dai, Q.; Knigge, B.; Marchon, B.

doi:10.1109/intmag.2003.1230823

Cited by 4 publications

(5 citation statements)

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“…The unique effects of slider-lubricant interaction and the associated nonlinearity have been characterized [52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71]. Dynamic lubricant meniscus force was once idealized as in the static case [19,20], in which the disk velocity is not considered.…”

Section: Nonlinear Dynamics Of Slider In Sub-10 Nm Clearance Regimementioning

confidence: 99%

“…The behavior of lubricants on disk under the effect of flying slider air-bearing has been studied extensively in [52,[57][58][59][60][61], in which the appearance of lubricant moguls and ripples as a slider flies above a particular disk track is reported. Lubricant moguls and ripples are observed to form and they change in frequency and amplitude, following the slider dynamics.…”

Section: Nonlinear Dynamics Of Slider In Sub-10 Nm Clearance Regimementioning

confidence: 99%

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Sensing and Identification of Nonlinear Dynamics of Slider with Clearance in Sub-5 Nanometer Regime

Sheng

2011

Advances in Tribology

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This paper provides an overview of the problems pertaining to the sensing and identification of nonlinear dynamics of slider with clearance in sub-5 nanometer regime. This problem is complex in nature because the nonlinear dynamics of slider in sub-5 nanometer clearance regime involves different sources of nonlinear, nonstationary, and uncertainty characteristics. For example, the involved forces such as air-bearing force, intermolecular force, and contact forces are all nonlinear. The complex interface interaction with mobile lubricant makes the slider response be nonstationary. Furthermore, the interfacial parameters are available only by assumptions in the sense of statistics. Most of the reported studies either focused on physics-based simulations by using assumed interfacial parameters or focused on experimental characterization. The issues of the sensing and identification of the nonlinear dynamic properties of slider in nanometer clearance regime will be discussed with an aim at illustrating the promising approaches for improving the correlation between test data and physics-based simulations.

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Section: Nonlinear Dynamics Of Slider In Sub-10 Nm Clearance Regimementioning

confidence: 99%

Section: Nonlinear Dynamics Of Slider In Sub-10 Nm Clearance Regimementioning

confidence: 99%

Sensing and Identification of Nonlinear Dynamics of Slider with Clearance in Sub-5 Nanometer Regime

Sheng

2011

Advances in Tribology

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“…Reduced flying height introduces another type of weak HDI interaction, i.e., lubricant/head modulation phenomenon addressed by Dai et al (2002Dai et al ( , 2003 and Marchon et al (2005). Here, the lubricant disjoining pressure between a head and a disc consists of lubricant film/carbon overcoat component and lubricant film/slider created negative pressure component.…”

Section: Physics Of Weak Hdi Interactionsmentioning

confidence: 99%

Ultra sensitive in-situ acoustic characterization system for HDD head disc interface defectoscopy

2006

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An ultra sensitive drive level acoustic characterization system has been developed for in-situ Head Disc Interface defectoscopy. Multimode acoustic emission (AE) sensor installed on the drive cover is designed for tracking air bearing (AB) and slider modes. Monitored modal changes at the AB and slider bandwidth correlate to the weak head disc interface (HDI) interactions such as lubricant modulation and particles induced defects. Two or three orders of magnitude increase in sensitivity can be achieved by a combination of advanced sensors, data acquisition hardware and digital signal processing algorithms. Continuous and Discrete Wavelet Transform and Joint Time-Frequency analyses are implemented for the AB modal data mining process. Performance of the newly developed technology is demonstrated on a normally operating hard disc drive (HDD).

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“…Research studies on the slider-disk contact interactions and the resulting slider vibrations have been of interest to the HDD community for a long time. Research investigations on the traditional (non-TFC) slider dynamics were motivated by the need to design low flying sliders while mitigating the contact-induced slider vibrations and slider-lubricant interactions, and extensive literature exists on these topics [1][2][3][4][5][6][7][8]. After the introduction of TFC sliders, several researchers have tried to understand and explain the contact and touchdown behavior of TFC sliders owing to its importance in HDD spacing calibration.…”

Section: Introductionmentioning

confidence: 99%

Parametric Investigations at the Head-Disk Interface of Thermal Fly-Height Control Sliders in Contact

Canchi

Bogy

Wang

et al. 2012

Advances in Tribology

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Accurate touchdown power detection is a prerequisite for read-write head-to-disk spacing calibration and control in current hard disk drives, which use the thermal fly-height control slider technology. The slider air bearing surface and head gimbal assembly design have a significant influence on the touchdown behavior, and this paper reports experimental findings to help understand the touchdown process. The dominant modes/frequencies of excitation at touchdown can be significantly different leading to very different touchdown signatures. The pressure under the slider at touchdown and hence the thermal fly-height control efficiency as well as the propensity for lubricant pickup show correlation with touchdown behavior which may be used as metrics for designing sliders with good touchdown behavior. Experiments are devised to measure friction at the head-disk interface of a thermal fly-height control slider actuated into contact. Parametric investigations on the effect of disk roughness, disk lubricant parameters, and air bearing surface design on the friction at the head-disk interface and slider burnishing/wear are conducted and reported.

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Time evolution of lubricant-slider dynamic interactions

Cited by 4 publications

References 0 publications

Sensing and Identification of Nonlinear Dynamics of Slider with Clearance in Sub-5 Nanometer Regime

Sensing and Identification of Nonlinear Dynamics of Slider with Clearance in Sub-5 Nanometer Regime

Ultra sensitive in-situ acoustic characterization system for HDD head disc interface defectoscopy

Parametric Investigations at the Head-Disk Interface of Thermal Fly-Height Control Sliders in Contact

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