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Magnetic Force Microscopy Analysis of Thermal Stability in Longitudinal Media

Published online by Cambridge University Press:  10 February 2011

E. N. Abarra ,
I. Okamoto  and
T. Suzuki
E. N. Abarra
Affiliation:
Toyota Technological Institute, Nagoya 468, Japan, [email protected]
I. Okamoto
Affiliation:
FUJITSU Ltd., Atsugi 243-01, Japan
T. Suzuki
Affiliation:
Toyota Technological Institute, Nagoya 468, Japan, [email protected]
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Abstract

The thermal stability of written bits in high density longitudinal recording media is investigated using magnetic force microscopy (MFM). The time dependence of the MFM signal is examined for different linear densities on CoCrPt-based media of various thickness. At ambient temperature, lesser decay is observed using the MFM compared to spin stand measurements on the same CoCrPtTaNb media on Al which emphasizes the dependence of bit stability with writing conditions. Moderate anneals at 373 K reveal a rapid initial ∼ 10% signal decay followed by stable behavior not observed in the magnetization time dependence measurements. 200 kfci tracks on a 20-nim thick CoCrPtTa medium on Si with a coercivity of 3 kOe displayed stable (∼ 2%) behavior against a 105-hour anneal at 373 K in air. These results are correlated with media properties to obtain parameters that are good indicators of thermal stability performance.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 517: Symposium F – Wide Bandgap Semiconductors for High Power, High Frequency , January 1998 , 255
Copyright
Copyright © Materials Research Society 1998

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