Abstract
The ac response at frequencies to 50 MHz of two thin-film magnetic recording heads placed in mirror symmetry with respect to one another is measured as a function of relative position and applied dc fields. One driven head can be used to sense the presence of a second head even when the second head is not driven. An array of wires with current in alternating directions from wire to wire is used to obtain the absolute response of thin-film heads. The efficiency of a head is found to be about 2/3.
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