Effect of underlayers on magnetic properties of Co/Pd multilayer perpendicular magnetic recording media

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

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Amorphous C and Si films were sputter-deposited as underlayers of Co/Pd multilayer perpendicular magnetic recording media. The magnetic properties of the media were significantly affected by the underlayer thickness; namely, the values of coercivity Hc and nucleation field -Hn increased and the value of α decreased with merely increasing the thickness of C or Si underlayer, where α is the derivative of M-H loop at the value of coercivity. The coercivity was not always affected by magnetic anisotropy constant Ku for the Co/Pd media. In read-write experiments, the higher S/N ratio was obtained for the media with the thicker C or Si underlayer, which exhibited low α and high Hc. In the time decay experiments of magnetization, the Co/Pd multilayer media with C or Si underlayer possessed good thermal stability. This study demonstrated that the introduction of C or Si underlayer greatly improves magnetic properties, read-write characteristics, and thermal stability of Co/Pd multilayer perpendicular magnetic recording media.

Original languageEnglish
Pages (from-to)82-86
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume235
Issue number1-3
DOIs
Publication statusPublished - 2001 Oct

Fingerprint

Magnetic recording
magnetic recording
Coercive force
Magnetic properties
Multilayers
magnetic properties
coercivity
Thermodynamic stability
thermal stability
Magnetic anisotropy
Magnetization
Nucleation
Experiments
Derivatives
nucleation
magnetization
anisotropy
decay

Keywords

  • Multilayers
  • Perpendicular magnetic recording
  • Underlayers

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Effect of underlayers on magnetic properties of Co/Pd multilayer perpendicular magnetic recording media. / Onoue, T.; Kawaji, J.; Kuramochi, K.; Asahi, Toru; Osaka, Tetsuya.

In: Journal of Magnetism and Magnetic Materials, Vol. 235, No. 1-3, 10.2001, p. 82-86.

Research output: Contribution to journalArticle

@article{e89ea3152a654dbabf858238d42e37c0,
title = "Effect of underlayers on magnetic properties of Co/Pd multilayer perpendicular magnetic recording media",
abstract = "Amorphous C and Si films were sputter-deposited as underlayers of Co/Pd multilayer perpendicular magnetic recording media. The magnetic properties of the media were significantly affected by the underlayer thickness; namely, the values of coercivity Hc and nucleation field -Hn increased and the value of α decreased with merely increasing the thickness of C or Si underlayer, where α is the derivative of M-H loop at the value of coercivity. The coercivity was not always affected by magnetic anisotropy constant Ku for the Co/Pd media. In read-write experiments, the higher S/N ratio was obtained for the media with the thicker C or Si underlayer, which exhibited low α and high Hc. In the time decay experiments of magnetization, the Co/Pd multilayer media with C or Si underlayer possessed good thermal stability. This study demonstrated that the introduction of C or Si underlayer greatly improves magnetic properties, read-write characteristics, and thermal stability of Co/Pd multilayer perpendicular magnetic recording media.",
keywords = "Multilayers, Perpendicular magnetic recording, Underlayers",
author = "T. Onoue and J. Kawaji and K. Kuramochi and Toru Asahi and Tetsuya Osaka",
year = "2001",
month = "10",
doi = "10.1016/S0304-8853(01)00304-3",
language = "English",
volume = "235",
pages = "82--86",
journal = "Journal of Magnetism and Magnetic Materials",
issn = "0304-8853",
publisher = "Elsevier",
number = "1-3",

}

TY - JOUR

T1 - Effect of underlayers on magnetic properties of Co/Pd multilayer perpendicular magnetic recording media

AU - Onoue, T.

AU - Kawaji, J.

AU - Kuramochi, K.

AU - Asahi, Toru

AU - Osaka, Tetsuya

PY - 2001/10

Y1 - 2001/10

N2 - Amorphous C and Si films were sputter-deposited as underlayers of Co/Pd multilayer perpendicular magnetic recording media. The magnetic properties of the media were significantly affected by the underlayer thickness; namely, the values of coercivity Hc and nucleation field -Hn increased and the value of α decreased with merely increasing the thickness of C or Si underlayer, where α is the derivative of M-H loop at the value of coercivity. The coercivity was not always affected by magnetic anisotropy constant Ku for the Co/Pd media. In read-write experiments, the higher S/N ratio was obtained for the media with the thicker C or Si underlayer, which exhibited low α and high Hc. In the time decay experiments of magnetization, the Co/Pd multilayer media with C or Si underlayer possessed good thermal stability. This study demonstrated that the introduction of C or Si underlayer greatly improves magnetic properties, read-write characteristics, and thermal stability of Co/Pd multilayer perpendicular magnetic recording media.

AB - Amorphous C and Si films were sputter-deposited as underlayers of Co/Pd multilayer perpendicular magnetic recording media. The magnetic properties of the media were significantly affected by the underlayer thickness; namely, the values of coercivity Hc and nucleation field -Hn increased and the value of α decreased with merely increasing the thickness of C or Si underlayer, where α is the derivative of M-H loop at the value of coercivity. The coercivity was not always affected by magnetic anisotropy constant Ku for the Co/Pd media. In read-write experiments, the higher S/N ratio was obtained for the media with the thicker C or Si underlayer, which exhibited low α and high Hc. In the time decay experiments of magnetization, the Co/Pd multilayer media with C or Si underlayer possessed good thermal stability. This study demonstrated that the introduction of C or Si underlayer greatly improves magnetic properties, read-write characteristics, and thermal stability of Co/Pd multilayer perpendicular magnetic recording media.

KW - Multilayers

KW - Perpendicular magnetic recording

KW - Underlayers

UR - http://www.scopus.com/inward/record.url?scp=0035477416&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035477416&partnerID=8YFLogxK

U2 - 10.1016/S0304-8853(01)00304-3

DO - 10.1016/S0304-8853(01)00304-3

M3 - Article

VL - 235

SP - 82

EP - 86

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

IS - 1-3

ER -