PURPOSE: To make it possible to directly measure the fundamental characteristics of a magnetic head, by reading the domain structure of a soft magnetic film having the magnetic field intensity and distribution of the magnetic field transferred thereto by utilizing magnetooptical effect.
CONSTITUTION: When a magnetic head 1 is arranged in close vicinity to a reading head 2, the domain of a soft magnetic film 2b is magnetized in the direction becoming vertical to the surface of the film by the vertical component of leaked magnetic flux generated from the magnetic head 1. This domain signal is read by utilizing magnetooptical effect. That is, the laser beam generated from a light source generation apparatus 3 is linearily polarized through a polarizer 4 to be supplied to a beam splitter 5 and the polarized beam is condensed to the soft magnetic film 2b by a lens 6. This condensed beam is reflected by a reflective film 2c and bent at a right angle by the beam splitter 5 through the lens 6 to be passed through an analyser 7. During this time, beam receives Farady optical rotation right or left corresponding to the magnetizing direction of the domain of the soft magnetic film 2b. A light receiving system 8 is constituted of a photoelectric signal converting system and the characteristics of the magnetic head 1 are judged from the signal converted to an electric signal.
AMANO TAKESHI
FUKUDA KAZUMASA
YAMANAKA NOBORU
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