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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.
English (United States)
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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...