Antonelli, Terry, Stout & Kraus
Magnetic disc unit having a plurality of magnetic heads which include multilayer magnetic films
 A magnetic disc unit has a thin film magnetic head in which a lower magnetic core and an upper magnetic core form a magnetic circuit. The upper magnetic core is constructed by magnetic films having at least two layers. A saturation magnetic flux density of the inside magnetic film, of the magnetic films having at least two layers, facing a magnetic gap of the magnetic circuit is larger than that of the outside magnetic films of the upper magnetic core and the lower magnetic core. 
Hitachi, Ltd.
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Makoto Hiroshi Tadayuki Moriaki Masaaki Kazuhiro Masanori Katsuya Shuji Makoto
Saito Fukui Iwakura Fuyama Sano Nakamoto Tanabe Mitsuoka Sudo Aihara