Magnetic head electromagnetic conversion efficiency measuring me

Electricity: measuring and testing – Magnetic – Magnetic information storage element testing

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324235, 324252, 338 32R, 360113, G01R 3306, G01R 3312, G11B 539

Patent

active

048536334

ABSTRACT:
A magnetic head characteristic measuring device for determining the recording and reproduction efficiencies of a magnetic head, which uses an MR block consisting of plural parallel magnetoresistive elements disposed on opposite sides of a reference plane aligned with the center of the gap of the magnetic head. The MR elements detect a change in the vertical component of the magnetic field caused by a change in a leakage magnetic field generated in the gap, to gauge the recording efficiency of the head. The measuring device also includes a further MR element or other conductor capable of generating a test magnetic field when supplied with a current. When this test magnetic field is being generated, a measurement of the response of the magnetic head is taken in order to gauge the reproduction efficiency of the same.

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patent: 4179720 (1979-12-01), Miura
patent: 4315291 (1982-02-01), Lazzari
patent: 4432028 (1984-02-01), Desserre et al.
patent: 4589041 (1986-05-01), Voegeli
patent: 4603365 (1986-07-01), Nakamura

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