Systems and methods for providing high performance soft magnetic underlayers for magnetic recording media
View Patent ↗Systems and methods for providing high performance soft magnetic underlayers for magnetic recording media are described. One such magnetic recording medium includes a substrate, an amorphous soft magnetic underlayer including CoFeMoNb on the substrate, where an atomic percent of the Mo is greater than about 8 and an atomic percent of the Nb is greater than about 9, and a magnetic recording layer on the soft magnetic underlayer.
1. A magnetic recording medium comprising:
a substrate;
an amorphous soft magnetic underlayer consisting of CoFeMoNb on the substrate, wherein an atomic percent of the Mo is about 8 and an atomic percent of the Nb is about 9; and
a magnetic recording layer on the soft magnetic underlayer.
2. The magnetic recording medium of claim 1 , wherein the atomic percent of the Nb is greater than the atomic percent of the Mo.
3. The magnetic recording medium of claim 1 , further comprising:
a seed layer on the substrate;
an interlayer on the seed layer;
a growth layer on the interlayer;
a granular layer on the growth layer;
a capping layer on the granular layer; and
an overcoat layer on the capping layer,
wherein the soft magnetic underlayer is positioned between the substrate and the seed layer, and
wherein the magnetic recording layer comprises the granular layer and the capping layer.
4. The magnetic recording medium of claim 3 :
wherein the substrate comprises a material selected from the group consisting of an Al alloy, NiP plated Al, glass, glass ceramic, and combinations thereof;
wherein the seed layer comprises a material selected from the group consisting of Ni, W, Fe, and combinations thereof;
wherein the interlayer comprises a material selected from the group consisting of Ru, Co, and combinations thereof;
wherein the growth layer comprises Ru;
wherein the granular layer comprises a material selected from the group consisting of Co, Cr, Ru, TiO2, Pt, B, SiO2, Cr2O3, CoO, Co3O4, and combinations thereof;
wherein the capping layer comprises a material selected from the group consisting of Co, Cr, Pt, B, and combinations thereof; and
wherein the overcoat layer comprises C.
5. The magnetic recording medium of claim 1 , wherein the magnetic recording medium and the soft magnetic underlayer are configured to be used in a perpendicular magnetic recording system.
6. The magnetic recording medium of claim 1 :
wherein the atomic percent of the Mo is 8 and the atomic percent of the Nb is 9.