The origin of signal-to-noise ratio improvements in laminated recording media

被引：5

作者：

Margulies, DT ^{[1
]}

Schabes, ME ^{[1
]}

Supper, N ^{[1
]}

Do, H ^{[1
]}

Berger, A ^{[1
]}

Moser, A ^{[1
]}

Rice, PM ^{[1
]}

Arnett, P ^{[1
]}

Madison, M ^{[1
]}

Lengsfield, B ^{[1
]}

Rosen, H ^{[1
]}

Fullerton, EE ^{[1
]}

机构：

[1] Hitachi Global Storage Technol, San Jose Res Ctr, San Jose, CA 95120 USA

来源：

APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 25期

关键词：

D O I：

10.1063/1.1831571

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report an experimental and theoretical study of laminated recording media made of two CoPtCrB magnetic layers separated by a Ru spacer layer. We find that a 4 A Ru spacer layer is sufficient to decorrelate the noise of the magnetic transitions in the two layers, thus producing improved media signal-to-noise ratios. This result is surprising given that the layers remain structurally correlated due to their epitaxial growth, and therefore the noise in the layers would be expected to be correlated as well. Experiments suggest that the reduced transition noise is produced by a slight shift between the transition locations in the layers. This shift is on the order of the grain size and allows the transitions to sample a different microstructure causing the noise associated with the transitions to be uncorrelated. (C) 2004 American Institute of Physics.

引用

页码：6200 / 6202

页数：3

共 7 条

[1] Different designs and limits of longitudinal magnetic recording media [J].

Girt, E ;

Richter, HJ ;

Munteanu, M ;

Yen, E ;

Harkness, SD ;

Brockie, RM .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (10) :7679-7681

[2] LAMINATED MEDIA FOR HIGH-DENSITY RECORDING [J].

LAMBERT, SE ;

HOWARD, JK ;

SANDERS, IL ;

ALLEGRANZA, OC .

IEEE TRANSACTIONS ON MAGNETICS, 1993, 29 (01) :223-229

[3] Interlayer coupling and magnetic reversal of antiferromagnetically coupled media [J].

Margulies, DT ;

Schabes, ME ;

McChesney, W ;

Fullerton, EE .

APPLIED PHYSICS LETTERS, 2002, 80 (01) :91-93

[4] NOISE PROPERTIES OF MULTILAYERED CO-ALLOY MAGNETIC RECORDING MEDIA [J].

MURDOCK, ES ;

NATARAJAN, BR ;

WALMSLEY, RG .

IEEE TRANSACTIONS ON MAGNETICS, 1990, 26 (05) :2700-2705

[5] Film optimization of laminated antiferromagnetically coupled media [J].

Tang, K ;

Tsang, C ;

Mirzamaani, M ;

Doerner, M ;

Polcyn, A ;

Bian, XP ;

Margulies, D ;

Fullerton, EE ;

Tang, L ;

Supper, N ;

Mercado, M .

IEEE TRANSACTIONS ON MAGNETICS, 2004, 40 (06) :3548-3550

[6]

TAYLOR JR, 1982, INTRO ERROR ANAL, P180

[7] Recording performance and thermal stability of laminated thin-film media [J].

Zhang, B ;

Xu, XP ;

Zhang, L ;

Johnson, KE .

IEEE TRANSACTIONS ON MAGNETICS, 2000, 36 (05) :2474-2476

← 1 →