Thermal pole-tip protrusion analysis of magnetic heads for hard disk drives

Aoki, Kenichiro; Hoshino, Tsutomu; Iwase, T.; Imamura, Takahiro; Aruga, K.

doi:10.1109/tmag.2005.855253

Cited by 14 publications

(3 citation statements)

References 6 publications

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“…They used finite element models and quantitatively identified the differences in the heat path for the two boundary conditions. They verified the numerical predictions with the experimental measured results [22].…”

Section: Thermally Expanding Stationary Bumpssupporting

confidence: 72%

A Dynamic Model of the Magnetic Head Slider With Contact and Off-Track Motion due to a Thermally Actuated Protrusion or a Moving Bump Involving Intermolecular Forces

Pathak

Shao

2016

ASME 2016 Conference on Information Storage and Processing Systems

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A computationally efficient five-degree-of-freedom dynamic model was developed to simulate the motion of a magnetic head slider under the conditions of moving-bump collision and of contact due to an expanding protrusion on the slider for thermal flying-height control, with consideration of intermolecular forces. Compared to results obtained without intermolecular forces for a bump on the rotating disk, the intermolecular forces cause a significantly greater normal contact force, a larger roll angle and a larger off-track displacement under nonzero skew. When an expanding protrusion on the slider reaches a position close to the disk surface, the intermolecular forces pull the slider into contact at an earlier time and keep the protrusion in contact for a longer duration, which, with friction under nonzero skew, results in a substantially greater off-track displacement.

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Section: Thermally Expanding Stationary Bumpssupporting

confidence: 72%

A Dynamic Model of the Magnetic Head Slider With Contact and Off-Track Motion due to a Thermally Actuated Protrusion or a Moving Bump Involving Intermolecular Forces

Pathak

Shao

2016

ASME 2016 Conference on Information Storage and Processing Systems

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“…FEM has been employed to simulate the temperature distribution and head expansion/protrusion amplitude for the TFC head extensively for flying conditions [3][4][5][6][7]. However, the focus was on the protrusion of the slider in the vertical direction, but not in the lateral directions.…”

Section: Hzmentioning

confidence: 99%

“…At present, studies on the TFC have been focused on the protrusion of the slider in the vertical direction and the flying height itself, and little has been reported on the lateral shift of the read/write head in the down-track and cross-track directions caused by the heating current as well as writing current induced heating effects. For instance, the finite element modelling (FEM) always assumed perfect in-plane symmetry in head structures and heating profiles [3][4][5][6][7]. Ideally, there should be only vertical movement of the R/W transducer, with no lateral movement along down-track and cross-track directions.…”

Section: Introductionmentioning

confidence: 99%

Thermal effects induced lateral head shift of thermal flying height control perpendicular magnetic recording head

Chen¹,

Leong²,

Huang³

et al. 2010

J. Phys. D: Appl. Phys.

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In this paper, we report a lateral shift of the read/write head due to thermal actuated protrusion by heating currents as well as writing currents as experimentally observed by atomic force microscopy. It was found that the shift amplitude is approximately proportional to the heating power within working range before saturation, which is consistent with the relationship between reduction of flying height and heating power. Scanning thermal microscopy (SThM) was further used to measure the magnitude of temperature change before and after thermal activation as well as the localized temperature distribution around the active region. The measured temperature change as large as ∼66 K by SThM gave a reasonable explanation for the observed significant lateral shift for non-flying conditions (as large as ∼758 nm along the down-track direction and ∼347 nm along the cross-track direction for heater power ∼16 mW). The asymmetry in fabricated head structures/heating profiles of the working head is proposed to be the cause of the observed lateral shift. The thermal activation induced off-track and down-track effect and the asymmetry may need to be considered in the design of thermal actuated flying height control and in accurate positioning control as areal density of disks increases.

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A method for monitoring head media spacing change in a hard disk drive using an embedded contact sensor

et al. 2020

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Thermal pole-tip protrusion analysis of magnetic heads for hard disk drives

Cited by 14 publications

References 6 publications

A Dynamic Model of the Magnetic Head Slider With Contact and Off-Track Motion due to a Thermally Actuated Protrusion or a Moving Bump Involving Intermolecular Forces

A Dynamic Model of the Magnetic Head Slider With Contact and Off-Track Motion due to a Thermally Actuated Protrusion or a Moving Bump Involving Intermolecular Forces

Thermal effects induced lateral head shift of thermal flying height control perpendicular magnetic recording head

A method for monitoring head media spacing change in a hard disk drive using an embedded contact sensor

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