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AssigneeHitachi, Ltd.
InventorsHiroyuki Suzuki, Yoshihiro Shiroishi, Sadao Hishiyama, Tomoyuki Ohno, Kazuetsu Yoshida, Shyuichi Kojima, Susumu Funamoto, Yasushi Kitazaki, Sakae Ohta, Hajime Aoi
Estimating the term…
Disclosed is a magnetic recording medium of the magnetic metal thin-film type for longitudinal recording, in which the noise is reduced by selecting the value of maximum torque L (the product of magnetic anisotropy energy Ku and magnetic layer volume v; as measured by setting the axis of rotation in plane of the medium) and the value of magnetic flux .phi. (the product of saturation magnetization Ms and magnetic layer volume v) from a range defined by 0<L/(2.pi..multidot..phi..sup.2)<4.times.10.sup.5 (erg/emu.sup.2).
A magnetic recording medium for longitudinal recording provided with a magnetic layer formed on a nonmagnetic substrate either directly or through an underlayer, which is characterized in that (A) said magnetic layer comprises a single metal species of Co, Ni or Fe or an alloy containing Co, Ni or Fe as major constituent and in that (B) the values of both (1) the maximum torque L represented by the product of a magnetic anisotropy energy Ku (as measured by setting the axis of rotation in the plane of the magnetic recording medium) and a magnetic layer volume v and (2) the magnetic flux .phi. represented by the product of a saturation magnetization Ms and a magnetic layer volume v are in the range defined by 0<L/(2.pi..multidot..phi..sup.2)<4.times.10.sup.5 (erg/emu.sup.2).
Dependencies are inferred from the claim text.