Williams-Comstock model with finite-length transition functions

Valstyn, E.; Bond, Caroline

doi:10.1109/20.748855

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Similar calculations have been carried out for transitions having shapes (10) and (11) where the latter has been referred to as a third order transition (TOP) [4] with transition width parameter . The hysteresis loops for all three transition shapes are shown in Fig.…”

Section: Resultsmentioning

confidence: 95%

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Hysteresis loops and transition shapes during recording

Middleton

Aziz²,

Miles

2000

IEEE Trans. Magn.

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Section: Resultsmentioning

confidence: 95%

“…It is very clear that the slower the magnetization in the transition is in approaching the remanent magnetization the more rounded the hysteresis loop. For a rectangular hysteresis loop the transition shapes proposed by Valstyn and Bond [4] appear to be good approximations.…”

Section: Resultsmentioning

confidence: 99%

Hysteresis loops and transition shapes during recording

Middleton

Aziz²,

Miles

2000

IEEE Trans. Magn.

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Modulation noise in thin-film metallic media: elements of pulse/transition modulation theory

Minuhin

2000

IEEE Trans. Magn.

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Modulation noise in thin film metallic media

Minuhin

INTERMAG 2000 Digest of Technical Papers. 2000 IEEE International Magnetics Conference

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In this work, media noise is considered as the magnetization derivative (MD) noise, because it is the MD, not thr magnetization, that produces external magnetic field that is sensed by any readhack head. This is in contrast to the previous treatments of media noise as additive, where the concepts of cross-track statistical averaging of magnetization and Poisson statistics for magnetic grains were employed [ I , 2, and references therein]. These works contained an implicit assumption that transitions in magnetization are uniform in shape and are written at their intended locations. However, in new advanced disk drives, the size of a magnetic bit has s h k dramatically, and contains only about 1-2 dozens of sfill stable magnetic grains. Furthennore, hit dimensions along the track have shrunk to -3-4 grains. In such an environment the traditional mapping technique "write c u r r e n f a e d i a magnetization" results in significant mapping errors. As pointed out in 131, when the sizes of magnetic sources are comparable with the track-width and hit wavelength, the concept uf statistical cross-track averaging becomes meaningless and Poisson statistics become irrelevant. Indeed, magnetic transitions (and pulses of MD) cannot be written at their intended locationsthey need to follow boundaries between magnetic grains, and the positions of MD-pulses deviate from their intended positions. Also, transitions (and pulses of MD) do not remain uniform; they fluctuate in shape and width, depending on grain distributions. A readback head, while reacting to an averaged MD across the track, integrates ragged deviations in transition contours. Thus, the media noiqe has a multiplicative characterit is a random multi-dimensionul mrdulotion of MD-pulses fhaf occurs in recording, hut ir sensed during readback. As was demonstrated in [4-61, an understanding of multiplicative media noise mechanism requires a separate analysis of MD behavior during recording and readback cycles.

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Williams-Comstock model with finite-length transition functions

Cited by 4 publications

References 7 publications

Hysteresis loops and transition shapes during recording

Hysteresis loops and transition shapes during recording

Modulation noise in thin-film metallic media: elements of pulse/transition modulation theory

Modulation noise in thin film metallic media

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