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, T.
AU - Osaka, T.
N1 - Funding Information:
This work was financially supported by the future project, “Ultra High-density Magnetic Recording” of the Japan Society for the Promotion of Science (JSPS-RFTF97R14401). The authors express their gratitude to Dr. Y. Okinaka, Waseda University, for his precious advice and to Mr. K. Ohashi and Mr. N. Ohshima, NEC Corporation, for their assistance in the torque measurements.
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
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U2 - 10.1016/S0304-8853(01)00304-3
DO - 10.1016/S0304-8853(01)00304-3
M3 - Conference article
AN - SCOPUS:0035477416
SN - 0304-8853
VL - 235
SP - 82
EP - 86
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - 1-3
T2 - Proceedings of the 5th Perpendicular Magnetic Recording Conference (PMRC 2000)
Y2 - 23 October 2000 through 26 October 2000
ER -