Magnetic recording medium
AssigneeTDK Corporation
InventorsAkira Saitoh, Yutaka Takahashi, Satoru Tsuchida
Life of this patent
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Abstract
A magnetic recording medium having excellent electromagnetic characteristics in the medium and high frequency regions has a magnetic layer formed on a non-magnetic support or a non-magnetic under layer, said magnetic layer comprising a magnetic metal powder containing iron (Fe) as a main component, 18 to 40% by weight of Co based on iron, Al and Y or a rare earth element, and having a specific surface area (x) by the BET method not exceeding 60 m.sup.2 /g, in which said magnetic metal powder has a saturation magnetization (.sigma.s) (y) and a specific surface area (x) by the BET method within the range bounded by the following four equations: y=0.05x.sup.2 -6x+330 (1) y=0.05x.sup.2 -6x+310 (2) y=x+126 (3) y=x+104 (4)
Claims11
A magnetic recording medium having a magnetic layer formed on a non-magnetic support or a non-magnetic under layer, said magnetic layer comprising a magnetic metal powder containing iron (Fe) as a main component, 18 to 40% by weight of Co based on iron, Al and Y or a rare earth element, and having a specific surface area (x) by the BET method not exceeding 60 m.sup.2 /g, in which said magnetic metal powder has a saturation magnetization (.sigma.s) (y) and a specific surface area (x) by the BET method within the range bounded by the following four equations:
- y=0.05x.sup.2 -6x+330 (1)
- y=0.05x.sup.2 -6x+310 (2)
- y=x+126 (3)
- y=x+104 (4).
Dependencies are inferred from the claim text.