Nonlinear, eddy current damped, thin-film write head model

Klaassen, K.B.; Hirko, R.G.

doi:10.1109/20.538678

Cited by 38 publications

(21 citation statements)

References 6 publications

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“…1). This differs from more standard models that have additional time constants (e.g., to model eddy current damping) [10] and a shunt capacitance to model the head self-resonance. This capacitance has little effect on the response of the head electrical network (when connected to an interconnect) for typical circuit values ( pF, , ps ).…”

Section: A Write Headmentioning

confidence: 98%

Designing disk drive interconnects to obtain a desired transmitted write current waveform

2002

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This paper describes the application of nonuniform transmission lines as interconnects for disk drive applications. The design method that we use is a direct optimization, approximating the interconnect as a cascade of piecewise uniform transmission line segments. Models for the write head, interconnect, and write driver are provided. We find nonuniform interconnects are most effective for low-turn heads ( 5 turns). We explore nonuniform interconnects as a way of inducing write current overshoot with short settling times (i.e., minimal ringing). For interconnects with total (one-way) propagation delay , the effective overshoot duration ranges from 2 to 100 ps. The effective overshoot amplitude is 50%. The waveforms generated by nonuniform interconnects are limited primarily by the constraint on the interconnect length. Any additional mechanical constraints on specific regions of the interconnect may cause the design impedance profile to be compromised. If this is the case, multiple smaller constrained regions are preferred to a single large region.Index Terms-Current overshoot, disk drive suspension interconnect, nonuniform transmission line optimization, pulse shaping.

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Section: A Write Headmentioning

confidence: 98%

Designing disk drive interconnects to obtain a desired transmitted write current waveform

2002

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“…Considerable work exists on longitudinal recording heads [12]- [14], but little work has been done on perpendicular recording heads. The cusp-field (CF) single-pole (SP) head [15]- [17] has several features that make it worthy of study.…”

Section: Introductionmentioning

confidence: 99%

“…Measurements of the high-frequency inductance provide considerable insight into the potential performance of recording heads [12]. Considerable work exists on longitudinal recording heads [12]- [14], but little work has been done on perpendicular recording heads.…”

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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“…Designers employ current loops to create electromagnetic fields for applications including medicine [1 -3], recording [4,5], weapons [6], actuators [7], pumps [8] and nondestructive testing [9]. Unintentionally created fields appear on printed circuit boards, interconnect wiring [10] and humans [11,12].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic fields generated by arbitrarily shaped current loops

Griffith

Pan

2012

IET Sci. Meas. Technol.

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New expressions for the magnetic and electric fields generated by arbitrarily shaped current loops are presented. The expressions pertain to all points in space outside the current conductor. Vector magnetic potential and certain first derivatives are calculated without recourse to field solvers; subsequent calculations yield magnetic flux density and electric field intensity. Understanding current loops finds application in fields including recording, medicine and weapons.

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Nonlinear, eddy current damped, thin-film write head model

Cited by 38 publications

References 6 publications

Designing disk drive interconnects to obtain a desired transmitted write current waveform

Designing disk drive interconnects to obtain a desired transmitted write current waveform

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

Electromagnetic fields generated by arbitrarily shaped current loops

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