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GMR head for helical-scan recording with a 5000-h head life

We describe a giant magnetoresistance (GMR) head for helical-scan recording that overcomes the problems of wear, corrosion, and thermal spikes. A flux guide GMR head is built on a very thin silicon structure that is protected by low-wear bearing materials. We describe both the design of the flux gui...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2003-09, Vol.39 (5), p.2387-2389
Main Authors: Hallamasek, K., Boots, M., Souchon, F., Hida, R., Panabiere, M., Albertini, J.-B., Viala, B.
Format: Article
Language:English
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Summary:We describe a giant magnetoresistance (GMR) head for helical-scan recording that overcomes the problems of wear, corrosion, and thermal spikes. A flux guide GMR head is built on a very thin silicon structure that is protected by low-wear bearing materials. We describe both the design of the flux guide microstructure that provides a high-bandwidth path for the flux to the GMR spin-valve sensor and the investigation of bearing materials that give low wear rate with acceptable pole tip recession. Avoiding large closure domains gives the flux guide a permeability greater than 1000 for a bandwidth better than 100 MHz. A bearing structure of Al/sub 2/O/sub 3/SiC gives a head life in excess of 5000 h. Tests with a 19-mm data recorder using conventional dual-layer metal particle tape suggest that this GMR head will support a threefold increase over current recording densities and still allow the reproduction of previous generation recordings.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2003.815458