Time Dependence of Magnetic Properties in Perpendicular Recording Media

Naoki HONDA; Kazuhiro OUCHI

Time Dependence of Magnetic Properties in Perpendicular Recording Media

Naoki HONDA, Kazuhiro OUCHI

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Time decay of magnetic properties in perpendicular magnetic recording media was studied. It was suggested that magnetization in media with a low energy ratio, KV/kT, of 50 is thermally stable in the absence of a demagnetizing field while coercivity exhibits a large time dependence. Magnetization in perpendicular recording media exhibited an appreciable time decay even for films with a large energy ratio of 300. The decay is attributed to the small perpendicular squareness due to a large perpendicular demagnetizing field acting in the media. The recording density dependence of the time decay in the output was explained in terms of the change in the demagnetizing field with the density. It is concluded that the use of media with large squareness as well as large energy ratio effectively reduces time decay in the output.

Publication: IEICE TRANSACTIONS on Electronics Vol.E80-C No.9 pp.1180-1186

Publication Date: 1997/09/25

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Type of Manuscript: Special Section PAPER (Special Issue on High Density Information Recording Technologies)

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Naoki HONDA, Kazuhiro OUCHI, "Time Dependence of Magnetic Properties in Perpendicular Recording Media" in IEICE TRANSACTIONS on Electronics, vol. E80-C, no. 9, pp. 1180-1186, September 1997, doi: .
Abstract: Time decay of magnetic properties in perpendicular magnetic recording media was studied. It was suggested that magnetization in media with a low energy ratio, KV/kT, of 50 is thermally stable in the absence of a demagnetizing field while coercivity exhibits a large time dependence. Magnetization in perpendicular recording media exhibited an appreciable time decay even for films with a large energy ratio of 300. The decay is attributed to the small perpendicular squareness due to a large perpendicular demagnetizing field acting in the media. The recording density dependence of the time decay in the output was explained in terms of the change in the demagnetizing field with the density. It is concluded that the use of media with large squareness as well as large energy ratio effectively reduces time decay in the output.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e80-c_9_1180/_p

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@ARTICLE{e80-c_9_1180,
author={Naoki HONDA, Kazuhiro OUCHI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Time Dependence of Magnetic Properties in Perpendicular Recording Media},
year={1997},
volume={E80-C},
number={9},
pages={1180-1186},
abstract={Time decay of magnetic properties in perpendicular magnetic recording media was studied. It was suggested that magnetization in media with a low energy ratio, KV/kT, of 50 is thermally stable in the absence of a demagnetizing field while coercivity exhibits a large time dependence. Magnetization in perpendicular recording media exhibited an appreciable time decay even for films with a large energy ratio of 300. The decay is attributed to the small perpendicular squareness due to a large perpendicular demagnetizing field acting in the media. The recording density dependence of the time decay in the output was explained in terms of the change in the demagnetizing field with the density. It is concluded that the use of media with large squareness as well as large energy ratio effectively reduces time decay in the output.},
keywords={},
doi={},
ISSN={},
month={September},}

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TY - JOUR
TI - Time Dependence of Magnetic Properties in Perpendicular Recording Media
T2 - IEICE TRANSACTIONS on Electronics
SP - 1180
EP - 1186
AU - Naoki HONDA
AU - Kazuhiro OUCHI
PY - 1997
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E80-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 1997
AB - Time decay of magnetic properties in perpendicular magnetic recording media was studied. It was suggested that magnetization in media with a low energy ratio, KV/kT, of 50 is thermally stable in the absence of a demagnetizing field while coercivity exhibits a large time dependence. Magnetization in perpendicular recording media exhibited an appreciable time decay even for films with a large energy ratio of 300. The decay is attributed to the small perpendicular squareness due to a large perpendicular demagnetizing field acting in the media. The recording density dependence of the time decay in the output was explained in terms of the change in the demagnetizing field with the density. It is concluded that the use of media with large squareness as well as large energy ratio effectively reduces time decay in the output.
ER -