Thermal Analysis of a Magnetic Head

Xu, Junguo; Kurita, Masayuki; Tokuyama, M.

doi:10.1109/tmag.2004.830208

Cited by 19 publications

(12 citation statements)

References 5 publications

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“…The effects of an important parameter on TP magnitude were also simulated in order to obtain a design guideline for reducing TP. In this report, the typical temperature distribution obtained with this simulation is compared with the experimental results obtained by Xu et al (4) with an infrared microscope.…”

Section: Introductionmentioning

confidence: 79%

“…The rotational speed, radial position of the head in the disk, skew angle, and applied load were 4 200 min −1 , 22 mm, 0 degree, and 27 mN. Figure 4 shows the experimental setup used by Xu et al (4) They used an infrared microscope and a 3.5-inch HDD to observe the temperature distribution on ABS during operation. Since a glass disk does not allow infrared rays to penetrate in high percentage, they used a sapphire disk and a fluorite window.…”

Section: Flying Height Analysismentioning

confidence: 99%

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Simulation of Thermal Protrusions on Magnetic Head Elements

Kurita

Tokuyama

et al. 2005

JSME Int. J., Ser. C

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Under recent low flying height conditions of magnetic head sliders, both the heat generated by the high-frequency current in the write coils and the rise in the ambient temperature cause local protrusion on head elements. Such protrusion reduces the flying height below the design value, thus reducing the safety margin for head/disk interference. To analyze this problem, we numerically simulated the heat transfer in the head slider, the thermal deformation of the head, and the flying height changes of the slider due to the deformation. The typical temperature distribution obtained from the simulation agrees well with reported experimental results. The simulation results show that decreasing the alumina base coat thickness can reduce the magnitude of a protrusion. For write-current-induced protrusions, the reduced flying height is partly compensated by increased air pressure on the air-bearing surface. However, almost the entire magnitude of an ambient-temperature-induced protrusion translates into flying height reduction.

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Section: Introductionmentioning

confidence: 79%

Section: Flying Height Analysismentioning

confidence: 99%

Simulation of Thermal Protrusions on Magnetic Head Elements

Kurita

Tokuyama

et al. 2005

JSME Int. J., Ser. C

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“…This TPR is one of the recent reliability issues in head/disk interface design and has been studied experimentally and numerically (Gupta et al 2001;Pust et al 2002;Wang et al 2001;Chen et al 2000;Ju et al 2001;Imamura et al 2002;Xu et al 2003Xu et al , 2004Kurita et al 2005). Utilizing this concept, we developed a flying-height control system using a built-in micro-actuator.…”

Section: Introductionmentioning

confidence: 99%

Active flying-height control slider using MEMS thermal actuator

et al. 2006

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Today's head/disk interface design has a wide flying height distribution due to manufacturing tolerances, environmental variations, and write-induced thermal protrusion. To reduce the magnetic spacing loss caused by these effects, we developed an active head slider with a nano-thermal actuator. The magnetic spacing of these sliders can be controlled in situ during drive operations. After simulating the heat transfer in the slider to obtain the thermal deformation of the airbearing surface, we fabricated a thermal actuator using thin-film processing. An evaluation done using a read/ write tester showed a linear reduction in the magnetic height as electric power was applied to the actuator. The actuator's stroke was 2.5 nm per 50 mW with a time constant of 1 ms. There was no significant impact on the reliability of the read element.

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“…Previous literatures [1][2][3][4][5][6][7][8][9][10][11][12][13] have shown that the Joule heat generated by write current in conventional magnetic recording and laser heating in heat-assisted magnetic recording (HAMR) will cause temperature rise, in turn, induce thermal deformation/protrusion of slider body. Thermal-induced writing head protrusions or pole tip protrusion may include two cases: writing-induced protrusion (W-PTR) and an ambient temperature-induced protrusion (T-PTR).…”

Section: Introductionmentioning

confidence: 99%