Thin-film magnetic head using impedance change at high frequency
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...
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Veröffentlicht in: | IEEE transactions on magnetics 1995-11, Vol.31 (6), p.2709-2711 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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/SiO/sub 2/ 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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ISSN: | 0018-9464 1941-0069 |
DOI: | 10.1109/20.490100 |