MAGNETIC RECORDING MEDIUM

摘要

A perpendicular magnetic recording medium includes a non-magnetic substrate; an underlayer including first and second underlayers; and a magnetic recording layer including a layer having a granular structure including grains of a magnetic crystal and grain boundary portions, wherein the first underlayer has a NaCl structure with a (001) orientation and contains a nitride or an oxide of at least one element. The first underlayer may contain a nitride of at least one of Cr, V, Ti, Sc, Mo, Nb, Zr, Y, Al, and B, and the second underlayer may include a plurality of island-shaped regions and contain at least one of Mg, Ca, Co, and Ni. The first underlayer may contains an oxide of at least one of Mg, Ca, Co, and Ni, and the second underlayer may include net-shaped regions and contain at least one of Cr, V, Ti, Sc, Mo, Nb, Zr, Y, Al, B, and C.

主权项

1. A perpendicular magnetic recording medium, comprising:
a non-magnetic substrate having a principle surface; an underlayer provided on the non-magnetic substrate that includes first and second underlayers; and a magnetic recording layer provided on the underlayer that includes a layer having a granular structure comprising grains of a magnetic crystal and grain boundary portions, wherein the first underlayer has a NaCl structure with a (001) orientation and contains a nitride or an oxide of at least one element; and wherein the second underlayer includes regions having a shape formed on the first underlayer.