On the thermal decay of magnetization in the presence of demagnetizing fields and a soft magnetic layer

Wood, Roger; Monson, J.; Coughlin, Tom

doi:10.1016/s0304-8853(98)00504-6

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…Although the perpendicular component of the static field of the single-layer medium can be 500 Oe larger than that of the double-layer film, the difference becomes smaller at the low and high ends of the recording density. At a lower recording density, the bit length increases and hence the magnetostatic field generated by the recording layer in the soft magnetic underlayer decreases [4]. At a higher recording density, on the other hand, the magnetization in the recording layer changes its direction over a short distance.…”

Section: Resultsmentioning

confidence: 98%

“…These effects are expected to improve the stability of the written bits against thermal fluctuation of double-layered perpendicular recording media. The change in the thermal stability of the perpendicular recording media was investigated analytically [4]. It was pointed out in this analysis that, when the recording density is extremely low, the effect of the soft magnetic underlayer in improving thermal stability is lost and hence the thermal stability of a single-layered medium is almost the same as that of a double-layered medium.…”

Section: Introductionmentioning

confidence: 99%

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Thermal stability of written bits in double-layered perpendicular recording media

Nakatani

Hayashi

Uesaka³

et al. 2002

IEEE Trans. Magn.

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The thermal stability of written bits on single-and double-layered perpendicular magnetic recording media were compared from micromagnetic simulation. It was found that, although double-layered media shows a higher thermal stability than the single-layered media, the difference is not large. Under the calculation conditions used here the gain in thermal stability by double-layering was found to correspond to 7.5% increase in the volume of a magnetic grain. It was also found that this difference tends to decrease at the low and high ends of recording density. Investigation of the magnetostatic field exerted in the recording layer shows that the change in the thermal stability is due to the change in the layer-thickness component of the static field exerted on the recording layer. Although the increase in the dispersion in the easy axes of magnetization was found to decrease thermal stability, the decrease was greater in single-layered films than double-layered films.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Thermal stability of written bits in double-layered perpendicular recording media

Nakatani

Hayashi

Uesaka³

et al. 2002

IEEE Trans. Magn.

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“…In PMR, the demagnetization field acting on an individual magnetic bit varies as a function of KFCI, the recording linear density [9]. With a simple wide-track approximation, the demagnetizing factor in a PMR media is given as (3) where and are the wave number and the media thickness, respectively.…”

Section: Demagnetization and Snr Decaymentioning

confidence: 99%

Correlation of ATI and SNR Decay in Magnetic Recording

et al. 2012

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We developed a multitrack average amplitude profile method to study adjacent track interference (ATI) in perpendicular magnetic recording. We have integrated a ATI test module into our spin stand. The consequence of demagnetization field on the thermal decay is characterized by signal-to-noise ratio (SNR) decay. The correlation between ATI and SNR decay suggests that the ATI is thermally activated decay.Index Terms-Adjacent track interference (ATI), demagnetization field, perpendicular magnetic recording (PMR), signal-to-noise ratio (SNR) decay, stray field.

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“…Most theoretical studies treat the media as assemblies of isolated or weakly coupled Stoner-Wohlfarth particles. 5,6 With a simple wide-track approximation, the demagnetizing factor 5 in a PMR media is given as…”

Section: Snr Decay Versus Linear Densitymentioning

confidence: 99%

“…It confirms that the lower frequency transitions written on the media are more prone to thermal instability. 5 The demagnetization depends on the KFCI. Most theoretical studies treat the media as assemblies of isolated or weakly coupled Stoner-Wohlfarth particles.…”

Section: Snr Decay Versus Linear Densitymentioning

confidence: 99%

Effect of perpendicular magnetic recording media nucleation field on thermal stability

Shi

Tang

et al. 2009

Journal of Applied Physics

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We developed a new component level thermal decay test that directly measures decays in media signal and noise, which are combined to obtain signal-to-noise ratio (SNR) decay. The SNR decay on spin stand is in good agreement with the hard disk drive bit error rate decay data. The effect of recording linear density (KFCI) on the SNR decay is studied, which is mainly attributed to the demagnetization field change with the recording density. Applying this test to a group of media with a broad range of nucleation field (Hn), it is found that the SNR decay correlates better with the Hn than with the thermal stability factor (KuV/kBT). For a perpendicular magnetic recording media with Hn∼−2000 Oe exhibits zero SNR decay, it indicates strong robustness thermal stability.

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On the thermal decay of magnetization in the presence of demagnetizing fields and a soft magnetic layer

Cited by 13 publications

References 8 publications

Thermal stability of written bits in double-layered perpendicular recording media

Thermal stability of written bits in double-layered perpendicular recording media

Correlation of ATI and SNR Decay in Magnetic Recording

Effect of perpendicular magnetic recording media nucleation field on thermal stability

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