Dynamic instability of flying head slider and stabilizing design for near-contact magnetic recording

Ono, Kyosuke

doi:10.1016/j.jmmm.2008.08.079

Cited by 13 publications

(7 citation statements)

References 33 publications

(48 reference statements)

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“…Elastic deformation of the mating surfaces at caused by a unit force applied at point is given by the following Green function (1) where is the composite Young's modulus given by (2) Here, , , and , are Young's moduli and Poisson's ratios for the slider and disk materials. The elastic deformation of two surfaces is equivalent to elastic deformation of the disk by a rigid spherical surface.…”

Section: Analytical Model and Methodsmentioning

confidence: 99%

“…T O achieve a stable and reliable head-to-disk interface in the near-contact recording regime, a sphere-to-flat interface is indispensable for reducing the adhesion and friction forces and the maximum contact pressure [1]. Such an interface can be realized by using thermal protrusion resulting from thermal flying height control [2] and would enable the slider flying height to be reduced to less than 5 nm.…”

Section: Introductionmentioning

confidence: 99%

“…However, recording at an areal density of 2 Tb/in (3.1 Gb/mm ) requires a mechanical spacing of 2-2.5 nm and a clearance of less than 0.5 nm, meaning that the slider will frequently come into contact with the disk. It seems that lubricant meniscus force plays a dominant role in the current head to disk interface problem rather than van der Waals (vdW) force [1], [3], [4]. When the separation between two surfaces decreases to about 1 nm or less, vdW force plays an important role in addition to the lubricant meniscus force.…”

Section: Introductionmentioning

confidence: 99%

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Effect of van der Waals Forces in a Near Contact Head-Disk Interface

Ono

2008

IEEE Trans. Magn.

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The minimum flying height, elastic deformation, and attractive pressure caused by van der Waals force under static air-bearing pressure were analyzed numerically using a spherical pad slider and a flat disk model. Parametric analysis revealed that when the pad radius of curvature was 20 mm, the minimum possible flying height was about 1 nm. The smallest roughness height, for reducing the van der Waals attractive force to less than the meniscus force, is 0.5 nm.Index Terms-Allowable minimum roughness, head-to-disk interface, minimum possible flying height, van der Waals force.

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Section: Analytical Model and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of van der Waals Forces in a Near Contact Head-Disk Interface

Ono

2008

IEEE Trans. Magn.

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“…The contact-induced nonlinearities of air-bearing slider have also been characterized [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. The latest research includes two-to three-dimensional motion of sliders contacting media, the bouncing vibrations of partial contact air-bearing sliders, using the generalized Reynolds equation modified with the Fukui-Kaneko slip correction, and a slip correction for the contact situation.…”

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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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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“…Because a thermally protruded surface is quasi-spherical with an effective radius of curvature of 20-30 mm at an allowable input power, the interfacial force between the slider and disk is significantly reduced [11]. Therefore, the stability of the slider is remarkably improved in the sub-10-nm flying height region compared to that of a conventional slider without a thermal protrusion [12].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Adhesion Characteristics of Spherical Sliders Colliding with Stationary Magnetic Disks with a Thin Lubricant Layer

Ono

Nakagawa

2008

Tribol Lett

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The dynamic indentation characteristics of 1-and 2-mm-radius hemispherical glass sliders when colliding with stationary magnetic disks under various lubricant conditions were investigated to clarify the dynamic interfacial forces between flying head sliders and magnetic disks. The collision times were *15 and *30 ls, respectively, and independent of the impact velocity. For a 1-mm-radius slider (Ra roughness = 1.71 nm), a clear adhesion force nearly equal to the static pull-off force was observed at the instant of separation when the lubricant thickness was from 1 nm without UV (0.69 nm mobile lubricant thickness) to 3 nm with UV (1.89 nm mobile lubricant thickness). The dynamic adhesion force was maximum when the slider had separated from the disk surface by about 2 nm and dropped from the maximum to zero when the separation reached more than 5 nm. When the mobile lubricant thickness was 0.43 nm, a clear adhesion force was not observed. For a 2-mm-radius slider (Ra roughness = 0.34 nm), a clear adhesion force, similar to the static pull-off force, was observed at the instant of separation at almost all lubricant thicknesses and impact velocities tested except at a small mobile lubricant thickness of 0.43 nm with impact velocities greater than 1.1 mm/s. The dynamic adhesion force dropped from the maximum to zero when the distance traveled from the maximum reached more than 5 nm. These results suggest that the dynamic adhesion force of 1-and 2-mm-radius sliders originates from meniscus formation rather than van der Waals force.

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Dynamic instability of flying head slider and stabilizing design for near-contact magnetic recording

Cited by 13 publications

References 33 publications

Effect of van der Waals Forces in a Near Contact Head-Disk Interface

Effect of van der Waals Forces in a Near Contact Head-Disk Interface

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

Dynamic Adhesion Characteristics of Spherical Sliders Colliding with Stationary Magnetic Disks with a Thin Lubricant Layer

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