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Nanocrystalline Materials for video recorder heads
Author(s) -
De Wit Hendrik Jan,
Witmer Cor H. M.,
Dirne Frank W. A.
Publication year - 1991
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.19910030706
Subject(s) - materials science , nanocrystalline material , amorphous solid , magnetic tape , ferrite (magnet) , video recording , videocassette recorder , recording head , optoelectronics , nanotechnology , inkwell , composite material , computer graphics (images) , computer science , crystallography , digital recording , telecommunications , chemistry
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.