Abstract
A time-dependent numerical simulation procedure is implemented to simulate the flying height response of a typical thermal flying height control (TFC) slider as a function of the power input to the heater element. The Reynolds equation is used in conjunction with a TFC slider finite element model to determine the change in the thermal protrusion and flying height of the slider. The power input signal to the heater element is optimized using convex optimization to minimize flying height variations of the slider. The optimization procedure is applied to a typical experimentally measured flying height profile. The numerical simulation results are in excellent qualitative agreement with experimental measurements.
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Boettcher U, Li H, de Callafon RA, Talke FE (2011) Dynamic flying height adjustment in hard disk drives through feed forward control. IEEE Trans Magn 47(1823):1829
de Callafon RA, Moaveni B, Conte JP, He X, Udd E (2008) General realization algorithm for modal identification of linear dynamic systems. J Eng Mech 134(9):712–722
Duwensee M (2007) Numerical and experimental investigations of the head/disk interface. PhD dissertation, University of California, San Diego
Fritzsche J, Li H, Zheng H, Amemiya K, Talke FE (2011) The effect of air bearing contour design on thermal pole-tip protrusion. Mycrosyst Technol 17:813–820
Kurita M, Xu J, Tokuyama M, Nakamoto K, Saegusa S, Maruyama Y (2005) Flying-height reduction of magnetic-head slider due to thermal protrusion. IEEE Trans Magn 41:3007–3009
Li H, Kurita M, Xu JG, Yoshida S (2010) Iteration method for analysis of write-current-induced thermal protrusion. Microsyst Technol 16:161–167
Liu B, Yu SK, Zhou WD, Wong CH, Hua W (2008) Low flying-height slider with high thermal actuation efficiency and small flying-height modulation caused by disk waviness. IEEE Trans Magn 44:145–150
LS-DYNA keyword user’s manual (2007) Version 971, Livermore Software Technology Corporation (LSTC)
Song S, Wang L, Rudman V, Fang D, Stoev D, Wang J, Sun B (2007) Finite element analysis of alternating write-current-induced pole tip protrusion in magnetic recording heads. IEEE Trans Magn 43:2217–2219
Wahl M, Lee P, Talke FE (1996) An efficient finite element-based air bearing simulator for pivoted slider bearings using bi-conjugate gradient algorithms. Trib Trans 39(1):130–138
Zhang S, Bogy DB (1999) A heat transfer model for thermal fluctuations in a thin slider/disk air bearing. Int J Heat Mass Transfer 42:1791–1800
Zhou WD, Liu B, Yu SK, Hua W, Wong CH (2008) A generalized heat transfer model for thin film bearings at head-disk interface. Appl Phys Lett 92:043109
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Salas, P.A., Boettcher, U. & Talke, F.E. Time dependent simulation of active flying height control of TFC sliders. Microsyst Technol 18, 1661–1667 (2012). https://doi.org/10.1007/s00542-012-1607-9
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DOI: https://doi.org/10.1007/s00542-012-1607-9