Apparatus for measuring flux and other hysteretic properties in

Details Apparatus for measuring flux and other hysteretic properties in Apparatus for measuring flux and other hysteretic properties in

1990-04-27

1992-08-04

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

324225, 324235, 324223, 324251, 369 58, 360112, G01R 3314, G01R 3306, G01N 2772, G11B 300

Patent

active

051362392

ABSTRACT:
Apparatus for measuring hysteretic properties of thin film recording disks is provided which comprises a magnetic field generator for magnetizing a spot on a piece of magnetic material to be tested. The magnetized spot is moved past a stationary Hall effect sensor which detects the magnetic flux being emitted from the magnetized spot. The process of magnetizing and detecting the flux emitted from the same spot is repeated at different magnetization levels to provide a set of automatic measurements that are recorded in a memory of a controller processor. An analysis of the recorded data permits the automatic computation of residual flux, remanent coercivity, switching field distribution as well as other hysteretic properties.

REFERENCES:
patent: 3359495 (1967-12-01), McMaster et al.
patent: 4843316 (1989-06-01), Hesterman
Magnetic Recording; C. D. Mee and E. D. Daniel; McGraw-Hill Book Co. .COPYRGT.1987; pp. 22-27 @Eq. (2.3b).
Magnetic Force Microscopy; General Principals etc. D. Rugar et al.; J. Appl. Phys 68(3); Aug. 1990; pp. 1169-1183 Eq (14) @1178.
Remanence and Longitudinal Recording . . . ; R. G. Simmons; IEEE Trans on Mag. vol. 26, No. 1, Jan. 1990; pp. 93-96 169 p. 93.
"A Hall Sensing Magnetometer for Measuring, Anisotrory, Rotational Loss and Time Effects", IEEE Transactions on Magnetics, vol. MAG-21, No. 5, Sep. 1985; by P. J. Flanders.

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