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Transfer Curve Magnetometer

IP.com Disclosure Number: IPCOM000049441D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Nystrom, W: AUTHOR [+3]

Abstract

The transfer curve magnetometer apparatus, as shown in the figure, provides a means for measuring the magnetic properties of magnetic recording disks by non-destructive and non-contact means.

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Transfer Curve Magnetometer

The transfer curve magnetometer apparatus, as shown in the figure, provides a means for measuring the magnetic properties of magnetic recording disks by non-destructive and non-contact means.

The apparatus includes erase, write and read heads 1 mounted to a circular plate 2 rotatable via a motor 3 perpendicular to the plane of the recording disk 4 under test. The rotation of the circular plate 2 is synchronized by a shaft encoder 5 fastened to the motor support 6 together with the motor 3. The recording disk 4 is fastened to a linear slider 7 via a clamping means 8 which could be a vacuum chuck. The linear slider 7 is fastened to a pivot bearing plate 9 that is rotatably fastened to the base support 10. The base support 10 is supported by legs 11 which provide an insulation against vibration. Rotational stops 12 are provided around the circumference of the pivot bearing plate 9 to permit the recording disk to be rotated 90 degrees to obtain the cross axis magnetic properties of the magnetic coating of the recording disk 4. A stop 13 is provided to limit the linear motion of the linear slider 7.

During the test, the disk 4 is kept stationary and the heads 1 sweep the disk 4 by the rotation of the circular plate. The four heads 1 separately perform an erase function, two write functions and a read function. The erase head resets the recording medium to saturation remanence. The first write head sets the full depth of the recording medium...