Advanced write heads for high density and high data rate recording

Yuan, S.W.; Lee, E.; Hsiao, Wen-Chien; Santini, H.; Lam, Hon-Ming; Sui, G.; Lam, T.T.; Luo, Yansheng; Madison, Michael; Никитин, В. В.; Webb, Bucknell C.; Shen, Yixiang; Ramasubramanian, M.; Jarratt, J.; Hsiao, R.; Harris, Thomas J.; Sahami, S.; Robertson, Neil; Freitas, David; Hsu, Yarsun; Williams, M. L.; Taratorin, Alexander M.; Heidmann, J.; Simmons, R.G.; Smyth, J. F.

doi:10.1109/tmag.2002.801786

Cited by 9 publications

(1 citation statement)

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“…It also appears that perpendicular recording [1] is becoming a next-generation candidate [2] as a result of its advantage over longitudinal recording in the area of thermal stability. Areal density [3]- [8] and 1-Gb/s data-rate demonstrations [8]- [11] exist for both longitudinal and perpendicular recording suggesting growth beyond present day limits are possible. It is the ultimate frequency response of the head and write channel that we wish to explore in this paper.…”

Section: Introductionmentioning

confidence: 99%

High-frequency inductance measurements and performance projections made for cusp-field single-pole heads

et al. 2003

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High-frequency measurements of the inductance of cusp-field single-pole heads for perpendicular recording are made out to 13.5 GHz to determine their performance. The inductance of the pole heads examined are typically 1.2-1.9 nH with a self resonance at about 7-10 GHz. Inductance versus current measurements allow construction of the nonlinear eddy-current damped, thin-film head model. Comparison is made to a longitudinal recording head of similar size and turns. The effect of the medium underlayer as part of the head return path is shown to have minimal effect on the head inductance. Contact Tri-Pad heads are used to demonstrate the changes produced by the underlayer and to demonstrate apex and yoke saturation. The contact behavior is similar to that for a longitudinal thin-film head. The frequency dependence of the pole material permeability is discussed. The conclusions provide a practical bit rate limit for the cusp-field head based on head and write channel modeling, experimental high-frequency inductance data, and spin reversal considerations.Index Terms-High-frequency performance, nonlinear eddycurrent damped head model, single-pole cusp-field head.

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