Linear density dependence of thermal decay in longitudinal recording

We present experimental and theoretical data on the signal decay of recordings measured at various densities. In contrast to expectations, the signal decay does not generally increase with increasing linear density; rather, it peaks at a surprisingly low density. Using a nondestructive spin-stand te...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2002-01, Vol.38 (1), p.260-270
Main Authors: Richter, H.J., Brockie, R.M., Pressesky, J.L.
Format: Article
Language:English
Subjects:
Activation
Anisotropic magnetoresistance
Applied sciences
Barriers
Decay
Density
Density measurement
Disk recording
Electronics
Energy barrier
Energy distribution
Energy use
Exact sciences and technology
Magnetic and optical mass memories
Magnetic anisotropy
Magnetic field measurement
Magnetic recording
Magnetism
Magnetization
Other magnetic recording and storage devices (including tapes, disks, and drums)
Perpendicular magnetic anisotropy
Phase shift
Recording
Storage and reproduction of information
Writing
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Summary:We present experimental and theoretical data on the signal decay of recordings measured at various densities. In contrast to expectations, the signal decay does not generally increase with increasing linear density; rather, it peaks at a surprisingly low density. Using a nondestructive spin-stand technique, we determined the energy barrier as well as the anisotropy field distribution. These experimental data are used in a self-consistent recording model that accounts for thermal activation effects at writing as well as at storage. We found that the record process inevitably induces phase shifts in the recorded pattern that lead to the observed decay behavior.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.990117