Apparatus for measuring the hysteresis loop of magnetic film

Details Apparatus for measuring the hysteresis loop of magnetic film Apparatus for measuring the hysteresis loop of magnetic film

1989-08-25

1990-05-01

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Hysteresis loop curve display or recording

324212, 324262, 356369, G01R 3312, G01R 3314

Patent

active

049222007

ABSTRACT:
A magneto-optic Kerr effect hysteresis loop measuring apparatus is provided which employs a pair of pole-pieces of the same magnetic polarity providing a high and uniform magnetic field strength in the gap between the oppositely disposed faces of the pole-pieces. The spot on the product which is to be nondestructively tested is placed in the gap between the pole-pieces in a region of uniform saturating magnetic field. A laser beam having a high polarization ratio is directed along an incident path with a spot on the surface of the product to be nondestructively tested, and a reflected beam is processed in a Kerr effect detector to provide hysteresis loop data. This data is capable of providing information sufficient to determine the squareness of the hysteresis loop and the coercivity of high coercivity material being nondestructively tested.

REFERENCES:
patent: 3940688 (1976-02-01), Lazzari et al.
patent: 4213091 (1980-07-01), Cooper
patent: 4410277 (1983-10-01), Yamamoto et al.
patent: 4658148 (1987-04-01), Naito
patent: 4816761 (1989-03-01), Josephs
Josephs et al, "Magneto-Optic Kerr Effect Hysteresis Loop Measurements on Particulate Recording Media", IEEE Transactions on Magnetics, vol. Mag. 22, No. 5, Sep. 1986, pp. 662-664.

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