Magnetic force scanning tunneling microscope imaging of overwrittendata
Gomez, R.D.
Adly, A.A.
Mayergoyz, I.D.
Burke, E.R.
Dept. of Electr. Eng., Maryland Univ., College Park, MD;
This paper appears in: Magnetics, IEEE Transactions on
Publication Date: Sep 1992
Volume: 28,
Issue: 5, Part 2
On page(s): 3141-3143
Meeting Date: 04/13/1992 - 04/16/1992
Location: St. Louis, MO, USA
ISSN: 0018-9464
References Cited: 8
CODEN: IEMGAQ
INSPEC Accession Number: 4344246
Digital Object Identifier: 10.1109/20.179738
Current Version Published: 2002-08-06
Abstract
The MFSTM (magnetic force scanning tunneling microscopy) technique
is shown to be a powerful technique for generating images of
magnetization patterns. Images of the overwritten data on commercial
magnetic disks and images of deliberately written patterns which serve
as benchmark are presented. The usefulness of this method for probing
the subtle effects of insufficient erasure during data overwrite.
Results demonstrate that, due to the limitations in the
electromechanical positioning of the recording head, overwritten data in
longitudinal rigid disk recording systems are not necessarily completely
erased. As a result, portions of the old data remain and could be
retrieved. In the future, this technique can provide some valuable
insights into various mechanisms associated with data overwrite, which
include questions about the minimum off-track deviation necessary before
the old data can persist
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