Emtec Magnetics Gmbh

Erich Hoffmann

Helmut Jakusch

August Lehner

Werner Lenz

Manfred Ohlinger

Albert Kohl

Norbert Schneider

Werner Loch

Peter Heilmann

Ronald J Veitch

Volker Koch

Harald Jachow

Rudi Lehnert

Werner H&uuml;bner

Klaus Gotz

Hans-Georg Gottmann

Hans-Joachim Jenor

Johann Voit

Described are tape-type magnetic recording media (I) including a non-magnetic substrate (III), at least one film applied to the substrate and, in at least one of these films, an inorganic acicular pigment (II) suitable for use as a supporting pigment, the ratio of the mean length to the mean diameter of the pigment (II) being at least 3 and the mean modulus of elasticity of the films being not less than 15 GPa in the longitudinal direction of the tape-type recording medium (I).

Magnetic recording media

A magnetic recording medium consisting of a nonmagnetic substrate and at least two magnetizable layers which are applied thereon and contain metal oxides as magnetic pigment is described, the pigment of the upper layer having a higher BET value than that in the lower layer. According to the invention, the upper layer has a thickness in the range of 3-5 .mu.m when dry and the lower layer a thickness in the range of 1.1-3 .mu.m when dry. Particularly advantageous results are obtained when the magnetic pigment of the upper layer is cobalt-doped .gamma.--Fe.sub.2 O.sub.3 and that of the lower layer is acicular CrO.sub.2. With the double-layer recording medium obtained according to the invention, in particular the output level at low frequencies is improved without the frequency curve showing the usual depression in the middle.

Magnetic recording medium

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Heidelberg, Germany

Erich Hoffmann