| 摘要 |
<p>A magnetic recording medium having a plurality of magnetic layers is disclosed. A first magnetic layer provided on a support member contains a Co-containing η-iron oxide magnetic material having a BET specific surface area of 25 to 40 m2/g and a coercive force (Hc) of 600 to 750 Oe, 0.05 to 0.3 % by weight of silicon with respect to the magnetic material, and 7 to 13 % by weight of carbon black with respect to the magnetic material. A second magnetic layer provided thereon contains a Co-containing η-iron oxide magnetic material having a BET specific surface area of 25 to 70m2/g and a coercive force (Hc) of 750 to 950 Oe, and less than 1 % by weight of carbon black with respect to the magnetic material. It is desired that the first magnetic layer contains phosphoric ester. Further, a binder for the magnetic material should preferably be a polyvinyl chloride containing electronegative functional groups. The magnetic recording medium produces large chroma output and RF output and exhibits well-balanced electromagnetic characteristics and running durability of the tape, so that it is suitably used as a recording material.</p> |
