TY - JOUR
T1 - Improvement of signal to noise ratio for Co/Pd multilayer perpendicular magnetic recording media by the addition of an underlayer
AU - Onoue, T.
AU - Asahi, T.
AU - Kuramochi, K.
AU - Kawaji, J.
AU - Homma, T.
AU - Osaka, T.
N1 - Funding Information:
This work was financially supported by a grant-in-aid for the Future Project, “Ultra High-density Magnetic Recording” of the Japan Society for the Promotion of Science (JSPS-RFTF97R14401) and a grant from the Storage Research Consortium. The authors thank Dr. Y. Okinaka for his useful comments on their manuscript.
PY - 2001/10
Y1 - 2001/10
N2 - Signal and noise characteristics of Co/Pd multilayer perpendicular magnetic recording media are discussed based upon MFM analysis. The noise of the Co/Pd multilayer media is originated mainly from irregularities in the magnetic transition regions, and can be drastically suppressed by increasing the thickness of the carbon underlayer although a large number of reversed magnetic domains between the magnetic transitions still exist. The fine magnetic clusters formed in the medium with a thick carbon underlayer result in clear magnetic transition boundaries of recorded bits in the high recording density region. By examining the profile of the M-H loops, the decrement in the α value, which is defined as the slope of M-H loop at the value of coercivity, improves the signal to noise (S/N) ratio for the Co/Pd multilayer media.
AB - Signal and noise characteristics of Co/Pd multilayer perpendicular magnetic recording media are discussed based upon MFM analysis. The noise of the Co/Pd multilayer media is originated mainly from irregularities in the magnetic transition regions, and can be drastically suppressed by increasing the thickness of the carbon underlayer although a large number of reversed magnetic domains between the magnetic transitions still exist. The fine magnetic clusters formed in the medium with a thick carbon underlayer result in clear magnetic transition boundaries of recorded bits in the high recording density region. By examining the profile of the M-H loops, the decrement in the α value, which is defined as the slope of M-H loop at the value of coercivity, improves the signal to noise (S/N) ratio for the Co/Pd multilayer media.
KW - Amorphous carbon underlayer
KW - Multilayers
KW - Perpendicular magnetic recording
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U2 - 10.1016/S0304-8853(01)00296-7
DO - 10.1016/S0304-8853(01)00296-7
M3 - Conference article
AN - SCOPUS:0035476855
SN - 0304-8853
VL - 235
SP - 40
EP - 44
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 -