Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

G - Physics

11

B

31/138, 117/24.2

G11B 5/70 (2006.01) G11B 5/706 (2006.01)

Patent

CA 1137297

Abstract of the disclosure A magnetic recording material, preferably for tape recorders which are designed for the iron oxide bias setting and for a playback equalization of 120 µs, consisting of a support and at least two layers containing magnetic pigments and binders and differing in coercivity and sayer thickness, the uppermost layer containing as acicular, magnetic pigment thermally stabilised magnetite containg from 0.1 to 5 % by weight of Cd, Ca, Mg, Zn, Al, Cr, W, P and/or B based on Fe3O4. The pigments have an average crystallite size of from 30 to 35 nm and a coercivity of from 28 to 36KA/m. These double-layer tapes have a low bias level and a high dynamic range despite a playback equalization of 120 µs.

319501

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