Method and device for measuring characteristic magnetic distribu

Details Method and device for measuring characteristic magnetic distribu Method and device for measuring characteristic magnetic distribu

1988-03-02

1990-07-10

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360 31, G01R 3312

Patent

active

049409387

ABSTRACT:
Primary and secondary coils are wound on a differential type magnetic head, and a low frequency signal is applied on the primary coil. Based on the difference between the output voltages from the head when an object of detection is placed near the magnetic head on the detection side and the output voltage therefrom when an object is not placed near the magnetic head, the magnetization characteristic curve of the magnetic flux and the magnetic field is calculated. Since the magnetization characteristic detection is determined by dividing a magnetic flux by the measured area cross section, once the magnetic flux is determined, a general B-H curve can be simply calculated. The magnetization characteristic measurement device includes a differential type magnetic head portion having plural differential type magnetic heads in linear arrangement which is positioned on or near the magnetic thin film of a detection object. The device can calculate magnetization characteristics of the magnetic thin film by applying a low frequency signal on the magnetic head, successively switching differential output voltages given to a cancellation core of the plural differential magnetic cores by a data converting section into digital data, and conducting software integration by a measured data analyzing section based on the data.

REFERENCES:
patent: 4752739 (1980-06-01), Wang

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