CGC perpendicular recording media with CoCrPt-SiO2 alloy as granular layer

Y. Sonobe; K. K. Tham; L. Wu; T. Umezawa; C. Takasu; J. A.H. Dumaya; T. Onoue; P. Leo; M. Liau

doi:10.1109/TMAG.2006.879431

CGC perpendicular recording media with CoCrPt-SiO2 alloy as granular layer

Y. Sonobe, K. K. Tham, L. Wu, T. Umezawa, C. Takasu, J. A.H. Dumaya, T. Onoue, P. Leo, M. Liau

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

We investigated a new class of coupled granular/continuous (CGC) perpendicular media consisting of CoCrPt-SiO₂ granular layer with magnetically decoupled small grains. By changing the number of Co/Pd bi-layers in the continuous layer, the degree of exchange coupling can be systematically controlled. The introduction of Co/Pd multilayer improved the nucleation field (H_n) from —570 to —1670 Oe and K_uV/k_BT values from 67 to 97. Compared to the base granular media, the CGC media had 1 dB gain in signal-to-noise ratio (SNR) as well as 14 dB gain in write-ability (OW). Moreover, the output decay was reduced from —0.11 to—0.035 dB per decade. In CGC approach, a more appropriate strength of exchange coupling can be introduced that yields the significant improvement in both SNR and thermal stability.

Original language	English
Pages (from-to)	2351-2353
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	42
Issue number	10
DOIs	https://doi.org/10.1109/TMAG.2006.879431
Publication status	Published - 2006 Oct
Externally published	Yes

Keywords

Continuous layer
exchange coupling
granular layer
perpendicular coupled granular/continuous (CGC) 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/TMAG.2006.879431

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title = "CGC perpendicular recording media with CoCrPt-SiO2 alloy as granular layer",

abstract = "We investigated a new class of coupled granular/continuous (CGC) perpendicular media consisting of CoCrPt-SiO2 granular layer with magnetically decoupled small grains. By changing the number of Co/Pd bi-layers in the continuous layer, the degree of exchange coupling can be systematically controlled. The introduction of Co/Pd multilayer improved the nucleation field (Hn) from —570 to —1670 Oe and KuV/kBT values from 67 to 97. Compared to the base granular media, the CGC media had 1 dB gain in signal-to-noise ratio (SNR) as well as 14 dB gain in write-ability (OW). Moreover, the output decay was reduced from —0.11 to—0.035 dB per decade. In CGC approach, a more appropriate strength of exchange coupling can be introduced that yields the significant improvement in both SNR and thermal stability.",

keywords = "Continuous layer, exchange coupling, granular layer, perpendicular coupled granular/continuous (CGC) media, signal-to-noise ratio, thermal stability",

author = "Y. Sonobe and Tham, {K. K.} and L. Wu and T. Umezawa and C. Takasu and Dumaya, {J. A.H.} and T. Onoue and P. Leo and M. Liau",

year = "2006",

month = oct,

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language = "English",

volume = "42",

pages = "2351--2353",

journal = "IEEE Transactions on Magnetics",

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T1 - CGC perpendicular recording media with CoCrPt-SiO2 alloy as granular layer

AU - Sonobe, Y.

AU - Tham, K. K.

AU - Wu, L.

AU - Umezawa, T.

AU - Takasu, C.

AU - Dumaya, J. A.H.

AU - Onoue, T.

AU - Leo, P.

AU - Liau, M.

PY - 2006/10

Y1 - 2006/10

N2 - We investigated a new class of coupled granular/continuous (CGC) perpendicular media consisting of CoCrPt-SiO2 granular layer with magnetically decoupled small grains. By changing the number of Co/Pd bi-layers in the continuous layer, the degree of exchange coupling can be systematically controlled. The introduction of Co/Pd multilayer improved the nucleation field (Hn) from —570 to —1670 Oe and KuV/kBT values from 67 to 97. Compared to the base granular media, the CGC media had 1 dB gain in signal-to-noise ratio (SNR) as well as 14 dB gain in write-ability (OW). Moreover, the output decay was reduced from —0.11 to—0.035 dB per decade. In CGC approach, a more appropriate strength of exchange coupling can be introduced that yields the significant improvement in both SNR and thermal stability.

AB - We investigated a new class of coupled granular/continuous (CGC) perpendicular media consisting of CoCrPt-SiO2 granular layer with magnetically decoupled small grains. By changing the number of Co/Pd bi-layers in the continuous layer, the degree of exchange coupling can be systematically controlled. The introduction of Co/Pd multilayer improved the nucleation field (Hn) from —570 to —1670 Oe and KuV/kBT values from 67 to 97. Compared to the base granular media, the CGC media had 1 dB gain in signal-to-noise ratio (SNR) as well as 14 dB gain in write-ability (OW). Moreover, the output decay was reduced from —0.11 to—0.035 dB per decade. In CGC approach, a more appropriate strength of exchange coupling can be introduced that yields the significant improvement in both SNR and thermal stability.

KW - Continuous layer

KW - exchange coupling

KW - granular layer

KW - perpendicular coupled granular/continuous (CGC) media

KW - signal-to-noise ratio

KW - thermal stability

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SN - 0018-9464

VL - 42

SP - 2351

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JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 10

ER -

CGC perpendicular recording media with CoCrPt-SiO2 alloy as granular layer

Abstract

Keywords

ASJC Scopus subject areas

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