Delayed relaxation in thin-film heads

Klaassen, K.B.; Peppen, J.C.L. van

doi:10.1109/20.42257

Cited by 38 publications

(12 citation statements)

References 3 publications

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“…If the heads are made of non-zero magnetostrictive materials, the changes in stressmagnetostriction products in turn trigger the metastable domain walls just after write to relax back to their static equilibrium positions [2]. During this thermal-transientdriven relaxation process, Barkhausen wall jumps occur when walls encounter and subsequently overcome localized pinning sites.…”

Section: Discussionmentioning

confidence: 99%

“…and it causes misregistrations in disk drives that utilize sectorservo schemes. This noise phenomenon has been explained to be caused by stress-induced delayed-relaxation Barkbausen wall jumps in the non-zero magnetostrictive head yokes [2]. The stress changes were in turn explained to be caused by the rapid cooling-off of thin mm heads after write [2].…”

Section: Introductionmentioning

confidence: 99%

“…which consists of large noise spikes occurring shortly (on the order of microseconds) after writing. has been observed in conventional thin fIlm inductive recording heads [2]. and it causes misregistrations in disk drives that utilize sectorservo schemes.…”

Section: Introductionmentioning

confidence: 99%

“…This noise phenomenon has been explained to be caused by stress-induced delayed-relaxation Barkbausen wall jumps in the non-zero magnetostrictive head yokes [2]. The stress changes were in turn explained to be caused by the rapid cooling-off of thin mm heads after write [2]. Conventional thin film heads with unstable domain structures near the backgap closure of lOp yokes.…”

Section: Introductionmentioning

confidence: 99%

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Popcorn Noise in Micro Flexbead<sup>®</sup> Components

Liu

Louis²,

Anderson³

et al. 1994

J. Magn. Soc. Jpn.

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---The effects of thermal transients after write, changes in stress-magnetostriction products and dynamic domain instabilities on popcorn noise probabilities in micro Flexhead® components were studied., It was observed that popcorn noise probabilities in micro Flexhead® components increase as the write current duration increases, until they saturate, with a specific write current amplitude. With increasing write current amplitude, the initial rate of change of noise probability with write current duration increases. In some cases where the resultant stress-magnetostriction products in micro Flexhead® components are negative, popcorn noise probabilities were observed to increase exponentially as functions of applied stress gradients. High rates of occurrence of dynamic domain instabilities have also been correlated with micro Flexhead® components that have high popcorn noise probabilities. Therefore. high probabilities of popcorn noise in micro Flexhead® components are caused by the combined effects of thermal transients after write, changes in stress-magnetostriction products and dynamic domain instabilities. Finally. an inductance fluctuation measurement technique was shown to be useful in quickly detecting micro Flexhead® components that are susceptible to popcorn noise.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Popcorn Noise in Micro Flexbead<sup>®</sup> Components

Liu

Louis²,

Anderson³

et al. 1994

J. Magn. Soc. Jpn.

View full text Add to dashboard Cite

show abstract

“…BER of the trailing sector increases by more than two orders after writing 10 times in the leading sector. Further tests indicated that this trailing sector erasure occurs for significantly longer time scales (410 ms) than typical relaxation of a thin-film head [5]. The sector manifested itself by ''rat-bites'' into the amplitude envelope, as shown in Fig.…”

Section: Introductionmentioning

confidence: 93%