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Browse Prior Art Database

Investigating Tracks of Information on Magnetic Tape

IP.com Disclosure Number: IPCOM000096613D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Bate, G: AUTHOR

Abstract

This method enables investigating the magnetic properties of tracks of information written on magnetic tape. The method is as follows: () Write and read back a track (or tracks) of information by the usual recording techniques. (2) Locate the position of the track by means of magnetic tape developers, i. e., Bitter patterns. (3) Cut out the track from the rest of the tape using a razor blade or scalpel. (4) Remove the tape developer by careful washing. (5) Measure the magnetic properties of the recorded track in a torsion balance magnetometer.

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Investigating Tracks of Information on Magnetic Tape

This method enables investigating the magnetic properties of tracks of information written on magnetic tape. The method is as follows: () Write and read back a track (or tracks) of information by the usual recording techniques. (2) Locate the position of the track by means of magnetic tape developers, i. e., Bitter patterns. (3) Cut out the track from the rest of the tape using a razor blade or scalpel. (4) Remove the tape developer by careful washing. (5) Measure the magnetic properties of the recorded track in a torsion balance magnetometer.

This method ensures that the properties of only that part of the recording surface which contributed to the read-back signal are measured. It is then possible to correlate, e.g., variations in read back signal envelope with variations in magnetic properties along the track. This is one of the many applications of the technique. Furthermore it is possible between steps (1) and (2) to subject the tape to different environments, such as heat, humidity, AC or DC fields, radiation particles, etc., and evaluate the results. It is also possible to examine the remanent intensity of the recorded tracks as a function of angle. This can be both on and out of the tape to determine the precise direction of magnetization in the tape after passing over a recording head.

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