1994
DOI: 10.1063/1.355360
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Dynamic domain instability and popcorn noise in thin-film heads

Abstract: The effects of dynamic domain instability on popcorn noise probabilities were studied by correlating the measured popcorn noise probabilities with the instantaneous observations of dynamic domain states of thin-film: heads during and after writing. Heads with large peak popcorn noise probabilities at intermediate values of write current amplitude were observed to exhibit asymmetric domain patterns and occa.sional popping wall motion in the yoke structure during writing. The occurrences of dynamic domain instab… Show more

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Cited by 9 publications
(6 citation statements)
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“…Increased write head fields with repeatable picosecond rise and fall times are required to increase storage densities and bit rates within perpendicular magnetic recording (PMR) technology, while avoiding erase after write 1 (EAW) phenomena and popcorn noise. 2 The pole tip, yoke, and confluence region together constitute a complex 3 dimensional object, and advanced measurement techniques have been developed to characterize its non-uniform magnetic state. 3 Previous experimental studies [4][5][6][7][8][9] of the rise time and remanent value of the write field have concentrated on the pole tip region.…”
mentioning
confidence: 99%
“…Increased write head fields with repeatable picosecond rise and fall times are required to increase storage densities and bit rates within perpendicular magnetic recording (PMR) technology, while avoiding erase after write 1 (EAW) phenomena and popcorn noise. 2 The pole tip, yoke, and confluence region together constitute a complex 3 dimensional object, and advanced measurement techniques have been developed to characterize its non-uniform magnetic state. 3 Previous experimental studies [4][5][6][7][8][9] of the rise time and remanent value of the write field have concentrated on the pole tip region.…”
mentioning
confidence: 99%
“…5 (a) and (b), respectively. Shades of black and white contrast were observed as the cumulative effect of many occurrences of Barkhausen wall jumps during and after write [3]. Almost· no domain instabilities during and after write were observed in the quiet micro Flexhead® components.…”
Section: Ill Experiments Al Resultsmentioning
confidence: 92%
“…either in the configuration of edge closure domains or spike-like domains. have also been found to be particularly noisy [3][4][5].…”
Section: Introductionmentioning
confidence: 99%
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“…Achieving this not only leads to an increase in areal density, but also reduced write times and reductions in erase after write errors 3 and popcorn noise. 4 The write heads studied here are effectively a planar electromagnet driven by electricallyconductive coils embedded beneath the magnetic material of the yoke. The write head is designed to maximize the available write field while minimizing erase after write errors and wide area track erasure.…”
Section: Introductionmentioning
confidence: 99%