Thermal stability and SNR of coupled granular/continuous media

Y. Sonobe; D. Weller; Y. Ikeda; M. Schabes; K. Takano; G. Zeltzer; B. K. Yen; M. E. Best; S. J. Greaves; H. Muraoka; Y. Nakamura

doi:10.1109/20.950932

Thermal stability and SNR of coupled granular/continuous media

Y. Sonobe^*, D. Weller, Y. Ikeda, M. Schabes, K. Takano, G. Zeltzer, B. K. Yen, M. E. Best, S. J. Greaves, H. Muraoka, Y. Nakamura

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

41 Citations (Scopus)

Abstract

We investigated coupled granular/continuous (CGC) perpendicular media consisting of a continuous multilayer for high thermal stability and a granular host layer to reduce noise. The addition of Co/Pt multilayers increased the nucleation field of the CoCr₁₈Pt₁₂ medium from 0 to -2000 Oe. Moreover, the moment decay was reduced from 4.8% to 0.1% per decade. Compared to Co/Pd multilayer media, the CGC medium had a 10 dB higher signal-to-noise ratio (SNR). The granular host layer significantly improved the SNR in the high-density region over 10 kfc/mm. Compared to the CoCr₂₀Pt₁₀ medium, the CGC medium had a 3 dB higher SNR in the low-density region. The medium noise for the CGC medium increased with the recording density, while the noise for the CoCr₂₀Pt₁₀ medium remained constant from 10 to 20 kfc/mm. The approach using CGC medium improves both the SNR and the thermal stability.

Original language	English
Pages (from-to)	1667-1670
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	37
Issue number	4 I
DOIs	https://doi.org/10.1109/20.950932
Publication status	Published - 2001 Jul
Externally published	Yes
Event	8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States Duration: 2001 Jan 7 → 2001 Jan 11

Keywords

Continuous layer
Granular layer
Perpendicular media
Signal-to-noise ratio
Thermal stability

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/20.950932

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title = "Thermal stability and SNR of coupled granular/continuous media",

abstract = "We investigated coupled granular/continuous (CGC) perpendicular media consisting of a continuous multilayer for high thermal stability and a granular host layer to reduce noise. The addition of Co/Pt multilayers increased the nucleation field of the CoCr18Pt12 medium from 0 to -2000 Oe. Moreover, the moment decay was reduced from 4.8% to 0.1% per decade. Compared to Co/Pd multilayer media, the CGC medium had a 10 dB higher signal-to-noise ratio (SNR). The granular host layer significantly improved the SNR in the high-density region over 10 kfc/mm. Compared to the CoCr20Pt10 medium, the CGC medium had a 3 dB higher SNR in the low-density region. The medium noise for the CGC medium increased with the recording density, while the noise for the CoCr20Pt10 medium remained constant from 10 to 20 kfc/mm. The approach using CGC medium improves both the SNR and the thermal stability.",

keywords = "Continuous layer, Granular layer, Perpendicular media, Signal-to-noise ratio, Thermal stability",

author = "Y. Sonobe and D. Weller and Y. Ikeda and M. Schabes and K. Takano and G. Zeltzer and Yen, {B. K.} and Best, {M. E.} and Greaves, {S. J.} and H. Muraoka and Y. Nakamura",

year = "2001",

month = jul,

doi = "10.1109/20.950932",

language = "English",

volume = "37",

pages = "1667--1670",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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note = "8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) ; Conference date: 07-01-2001 Through 11-01-2001",

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TY - JOUR

T1 - Thermal stability and SNR of coupled granular/continuous media

AU - Sonobe, Y.

AU - Weller, D.

AU - Ikeda, Y.

AU - Schabes, M.

AU - Takano, K.

AU - Zeltzer, G.

AU - Yen, B. K.

AU - Best, M. E.

AU - Greaves, S. J.

AU - Muraoka, H.

AU - Nakamura, Y.

PY - 2001/7

Y1 - 2001/7

N2 - We investigated coupled granular/continuous (CGC) perpendicular media consisting of a continuous multilayer for high thermal stability and a granular host layer to reduce noise. The addition of Co/Pt multilayers increased the nucleation field of the CoCr18Pt12 medium from 0 to -2000 Oe. Moreover, the moment decay was reduced from 4.8% to 0.1% per decade. Compared to Co/Pd multilayer media, the CGC medium had a 10 dB higher signal-to-noise ratio (SNR). The granular host layer significantly improved the SNR in the high-density region over 10 kfc/mm. Compared to the CoCr20Pt10 medium, the CGC medium had a 3 dB higher SNR in the low-density region. The medium noise for the CGC medium increased with the recording density, while the noise for the CoCr20Pt10 medium remained constant from 10 to 20 kfc/mm. The approach using CGC medium improves both the SNR and the thermal stability.

AB - We investigated coupled granular/continuous (CGC) perpendicular media consisting of a continuous multilayer for high thermal stability and a granular host layer to reduce noise. The addition of Co/Pt multilayers increased the nucleation field of the CoCr18Pt12 medium from 0 to -2000 Oe. Moreover, the moment decay was reduced from 4.8% to 0.1% per decade. Compared to Co/Pd multilayer media, the CGC medium had a 10 dB higher signal-to-noise ratio (SNR). The granular host layer significantly improved the SNR in the high-density region over 10 kfc/mm. Compared to the CoCr20Pt10 medium, the CGC medium had a 3 dB higher SNR in the low-density region. The medium noise for the CGC medium increased with the recording density, while the noise for the CoCr20Pt10 medium remained constant from 10 to 20 kfc/mm. The approach using CGC medium improves both the SNR and the thermal stability.

KW - Continuous layer

KW - Granular layer

KW - Perpendicular media

KW - Signal-to-noise ratio

KW - Thermal stability

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DO - 10.1109/20.950932

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VL - 37

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EP - 1670

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 4 I

T2 - 8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag)

Y2 - 7 January 2001 through 11 January 2001

ER -

Thermal stability and SNR of coupled granular/continuous media

Abstract

Keywords

ASJC Scopus subject areas

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