High-density recording capability of granular media composed of Co-Pt grains and SiO/sub 2/ matrix

Co-Pt and SiO/sub 2/ granular films were prepared on a Cr seed layer. Co-Pt grains dispersed in the SiO/sub 2/ matrix discretely. Conical grains grew in contact with the Cr layer and spherical grains grew between the conical ones. Coercivity exceeded 2 kOe and coercive squareness reached about 0.7 a...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1998-07, Vol.34 (4), p.1603-1605
Main Authors: Ichihara, K., Kikitsu, A., Yusu, K., Nakamura, F., Ogiwara, H.
Format: Article
Language:English
Subjects:
Bit error rate
Chromium
Coercive force
Couplings
Magnetic films
Magnetic heads
Magnetic properties
Magnetic recording
Magnetic separation
Microstructure
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Summary:Co-Pt and SiO/sub 2/ granular films were prepared on a Cr seed layer. Co-Pt grains dispersed in the SiO/sub 2/ matrix discretely. Conical grains grew in contact with the Cr layer and spherical grains grew between the conical ones. Coercivity exceeded 2 kOe and coercive squareness reached about 0.7 at a remanent magnetic moment of 0.4 memu/cm/sup 2/. Activating magnetic moment was 10/sup -15/ emu and the index of the thermal stability was about 100. Bit error rate was held below 10/sup -5/ up to a linear density of 280 kfci. The recording pattern at the track width of 1 /spl mu/m was clearly visible. The Co-Pt and SiO/sub 2/ granular media have potential for 5 Gb/in/sup 2/ recording.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.706629