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Thin-film magnetic head using impedance change at high frequency

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4 Author(s)
Senda, Masakatsu ; NTT Interdisciplinary Res. Labs., Ibaraki, Japan ; Takei, Koji ; Ishii, Osamu ; Koshimoto, Y.

This article reports on the reproducing characteristics of a new type of thin-film magnetic head, which is based on impedance change due to field dependent permeability at a frequency of several MHz. The head is flux responsive, and a field from a medium is perceived as an amplitude modulation of an AC carrier voltage and reproduced by detection. In order to obtain a large change, the head element is composed of magnetic core/sensing lead/magnetic core sandwich structure, and a NiFe/SiO2 multilayer film is adopted for the cores. The lead is also used for a DC bias. A single pole type head and a ring type head, both with this simple core/lead/core structure, were examined for two fundamental operations, and were confirmed to exhibit a differential waveform and an integral waveform, respectively

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Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 6 )