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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29530

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Target and Equalizer Design for Perpendicular Heat-Assisted Magnetic Recording
Heat-Assisted Magnetic Recording (HAMR) is one of the leading technologies identified to enable areal density beyond 1 Tb/in2 of magnetic recording systems. A key challenge to HAMR designing is accuracy of positioning, timing of the firing laser, power of the laser, thermo-magnetic head, head-disk interface and cooling system. We study the effect of HAMR parameters on transition center and transition width. The HAMR is model using Thermal Williams-Comstock (TWC) and microtrack model. The target and equalizer are designed by the minimum mean square error (MMSE). The result shows that the unit energy constraint outperforms other constraints.
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[1] O. Heinonen and K.Z Gao, "Extension of perpendicular recording," Journal of Magnetism and Magnetic Material, 2008, pp.2885-2888.
[2] Y. Shiroishi, K. Fukuda et al., "Future Options for HDD Storage," IEEE Trans. Magn., vol. 45, no. 10, pp. 3816-3822, Oct. 2009.
[3] E.M. Kurtas, M.F. Erden et al., "Future read channel technologies and challenges for high density data storage applications, Acoustics, Speech, and Signal Processing,” Proceedings of ICASSP 2005, pp. 737-740.
[4] T. Rausch, J.A. Bain, D.D. Stancil, and T.E. Schelsinger, "Thermal Williams-Comstock model for predicting transition lengths in heat-assisted magnetic recording system," IEEE Trans. Magn., vol. 40, no. 1, pp. 137-147, Jan. 2004.
[5] M.F. Erden, T. Rausch, W.A. Challener, "Cross-track location and transition parameter effects in heat-assisted magnetic recording,” IEEE Trans. Magn., vol. 41, no. 6, pp.2189-2194, Jun. 2005.
[6] R. Radhakrishnan, M.F. Erden et al., "Transition Response Characteristics of Heat-Assisted Magnetic Recording and Their Performance With MTR Codes," IEEE Trans. Magn., vol. 43, no. 6, pp. 2298-2300, Jun. 2007.
[7] R. Radhakrishnan, B. Vasic, M.F. Erden et al., "Characterization of of Heat-Assisted Magnetic Recording Channels,” DIMACS Series in Discrete Mathematic sand Theoretical Computer Science, vol. 73, pp. 25-41, 2007.
[8] M.H. Kryder, E.C. Gage et al., "Heat-Assisted Magnetic Recording,” Invited Paper Proceedings of the IEEE, vol. 96, no. 11: 1810-1835, Noember. 2008.
[9] R. Wongsathan and P. Supnithi "Channel response of HAMR with linear temperature-dependent coercivity and remanent magnetization,” in Conf. Rec. 2012 IEEE Int Conf. ECTI-CON, 2012, pp. 1-4.
[10] J.U. Thiele, K.R. Coffey, M.F. Toney, J.A. Hedstrom, and A.J. Kellock, "Temperature dependent magnetic properties of highly chemically ordered Fe55−xNixPt45L10 films,” J. Appl. Phys., vol. 91, no. 10, pp. 6595-6600, May 2002.
[11] P. Kovintavewat, I. Ozgunes, E. Kurtas, J.R. Barry and S.W. McLaughlin, "Generalized Partial-Reaponse Targets for Perpendicular Recording with Jitter Noise,” IEEE Trans. Magn., vol.38, no.5, pp. 2340-2342, Sep. 2002.
[12] H.N. Bertram, Theory of Magnetic Recording. Cambridge, U.K.: Cambridge Univ. Press 1994, ch. 5, pp. 107-138.
[13] B. Vasic and E.M. Kurtas, Coding and Signal Processing for Magnetics Recording Systems, Boca Raton, CRC PRESS 2005, ch. 2, pp. 2.2-1-2.2-26.
[14] P. Kovintavewat, Signal Processing for Digital Data Storage Volume II: Receiver Design, National Electronics and computer Techonology Center(NECTEC) 2007, ch. 3, pp. 43-64.
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