Received a Ph. D. from the University of Amsterdam in 1965, and then joined the Philips Research Laboratories in Eindhoven to work successively on oxidic and glassy semiconductors and electrolytic capacitors. Since 1983 he is concerned with soft magnetic materials.
Nanocrystalline Materials for video recorder heads
Article first published online: 15 SEP 2004
Copyright © 1991 Verlag GmbH & Co. KGaA, Weinheim
Volume 3, Issue 7-8, pages 356–360, July 1991
How to Cite
De Wit, H. J., Witmer, C. H. M. and Dirne, F. W. A. (1991), Nanocrystalline Materials for video recorder heads. Adv. Mater., 3: 356–360. doi: 10.1002/adma.19910030706
- Issue published online: 15 SEP 2004
- Article first published online: 15 SEP 2004
- Manuscript Received: 22 MAR 1991
In present video recorders the magnetic materials of the record/playback head is usually a crystalline ferrite. These materials are, however, not so suitable, when substantially finer details on the magnetic tape are required, e.g. for high-definition television (HDTV) recording. The search for an alternative has resulted in a new type of magnetic material: multilayers in which crystalline iron layers of about 10 nm thickness are alternated with even thinner amorphous iron-alloy layers. These ‘nanocrystalline’ materials combine a high saturation magnetization with a high permeability in the MHz frequency range, allowing video recording at much increased information densities.