| 摘要 |
<p>An object of the present invention is to provide a magnetic recording medium having magnetic dots achieving high density recording. Another object of the present invention is to provide a simple manufacturing method thereof. A magnetic recording medium comprises at least an underlayer 3, a magnetic recording layer 4, and a protective layer 5 sequentially laminated on a nonmagnetic substrate 1. The underlayer 3 is composed of ruthenium or an alloy of mainly ruthenium and has an undulating structure formed with ridge lines in a predetermined pitch on the surface of the underlayer. The magnetic recording layer 4 contains at least ferromagnetic crystal grains and a nonmagnetic component. Magnetic dots 4-1 composed of the crystal grains with a grain size not smaller than 4 nm in the magnetic recording layer are aligned on a surface of the underlayer along the ridge line, and each of the magnetic dots 4-1 is separated by the nonmagnetic component 4-2 from each other.</p> |
