Analysis of microstructures for Co/Pd multilayer perpendicular magnetic recording media with carbon underlayer

Toru Asahi, K. Kuramochi, J. Kawaji, T. Onoue, Tetsuya Osaka, M. Saigo

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The effect of amorphous carbon underlayer thickness on the microstructure of the Co/Pd multilayer perpendicular magnetic recording media was investigated. From the magnetic force microscopy observation in the AC-demagnetized state of the Co/Pd multilayer media, the magnetic cluster size was observed to effectively decrease with an increase in carbon underlayer thickness, where the higher coercivity and the higher S/N ratio of the Co/Pd multilayer media were obtained with the thicker underlayer. Furthermore, the distribution of [1 1 1] orientation of FCC-Pd became broader, and the grain size decreased with an increase in the carbon underlayer thickness. These effects caused the magnetic exchange decoupling of Co/Pd multilayer media. We suggested that the change of microstructure was directly related to the surface roughness of the amorphous carbon underlayer.

Original languageEnglish
Pages (from-to)87-92
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume235
Issue number1-3
DOIs
Publication statusPublished - 2001 Oct

Fingerprint

Magnetic recording
magnetic recording
Multilayers
Carbon
Amorphous carbon
microstructure
Microstructure
carbon
Magnetic force microscopy
Coercive force
magnetic force microscopy
Surface roughness
decoupling
coercivity
alternating current
surface roughness
grain size

Keywords

  • Amorpgous carbon underlayer
  • Multilayers
  • Perpendicular magnetic recording

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Analysis of microstructures for Co/Pd multilayer perpendicular magnetic recording media with carbon underlayer. / Asahi, Toru; Kuramochi, K.; Kawaji, J.; Onoue, T.; Osaka, Tetsuya; Saigo, M.

In: Journal of Magnetism and Magnetic Materials, Vol. 235, No. 1-3, 10.2001, p. 87-92.

Research output: Contribution to journalArticle

@article{235a4f64253745d6897fcba9bce68b7f,
title = "Analysis of microstructures for Co/Pd multilayer perpendicular magnetic recording media with carbon underlayer",
abstract = "The effect of amorphous carbon underlayer thickness on the microstructure of the Co/Pd multilayer perpendicular magnetic recording media was investigated. From the magnetic force microscopy observation in the AC-demagnetized state of the Co/Pd multilayer media, the magnetic cluster size was observed to effectively decrease with an increase in carbon underlayer thickness, where the higher coercivity and the higher S/N ratio of the Co/Pd multilayer media were obtained with the thicker underlayer. Furthermore, the distribution of [1 1 1] orientation of FCC-Pd became broader, and the grain size decreased with an increase in the carbon underlayer thickness. These effects caused the magnetic exchange decoupling of Co/Pd multilayer media. We suggested that the change of microstructure was directly related to the surface roughness of the amorphous carbon underlayer.",
keywords = "Amorpgous carbon underlayer, Multilayers, Perpendicular magnetic recording",
author = "Toru Asahi and K. Kuramochi and J. Kawaji and T. Onoue and Tetsuya Osaka and M. Saigo",
year = "2001",
month = "10",
doi = "10.1016/S0304-8853(01)00305-5",
language = "English",
volume = "235",
pages = "87--92",
journal = "Journal of Magnetism and Magnetic Materials",
issn = "0304-8853",
publisher = "Elsevier",
number = "1-3",

}

TY - JOUR

T1 - Analysis of microstructures for Co/Pd multilayer perpendicular magnetic recording media with carbon underlayer

AU - Asahi, Toru

AU - Kuramochi, K.

AU - Kawaji, J.

AU - Onoue, T.

AU - Osaka, Tetsuya

AU - Saigo, M.

PY - 2001/10

Y1 - 2001/10

N2 - The effect of amorphous carbon underlayer thickness on the microstructure of the Co/Pd multilayer perpendicular magnetic recording media was investigated. From the magnetic force microscopy observation in the AC-demagnetized state of the Co/Pd multilayer media, the magnetic cluster size was observed to effectively decrease with an increase in carbon underlayer thickness, where the higher coercivity and the higher S/N ratio of the Co/Pd multilayer media were obtained with the thicker underlayer. Furthermore, the distribution of [1 1 1] orientation of FCC-Pd became broader, and the grain size decreased with an increase in the carbon underlayer thickness. These effects caused the magnetic exchange decoupling of Co/Pd multilayer media. We suggested that the change of microstructure was directly related to the surface roughness of the amorphous carbon underlayer.

AB - The effect of amorphous carbon underlayer thickness on the microstructure of the Co/Pd multilayer perpendicular magnetic recording media was investigated. From the magnetic force microscopy observation in the AC-demagnetized state of the Co/Pd multilayer media, the magnetic cluster size was observed to effectively decrease with an increase in carbon underlayer thickness, where the higher coercivity and the higher S/N ratio of the Co/Pd multilayer media were obtained with the thicker underlayer. Furthermore, the distribution of [1 1 1] orientation of FCC-Pd became broader, and the grain size decreased with an increase in the carbon underlayer thickness. These effects caused the magnetic exchange decoupling of Co/Pd multilayer media. We suggested that the change of microstructure was directly related to the surface roughness of the amorphous carbon underlayer.

KW - Amorpgous carbon underlayer

KW - Multilayers

KW - Perpendicular magnetic recording

UR - http://www.scopus.com/inward/record.url?scp=0035477386&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035477386&partnerID=8YFLogxK

U2 - 10.1016/S0304-8853(01)00305-5

DO - 10.1016/S0304-8853(01)00305-5

M3 - Article

VL - 235

SP - 87

EP - 92

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

IS - 1-3

ER -