Magnetic anisotropy of soft-underlayer induced by seedlayer
AssigneeSeagate Technology LLC
InventorsChung-Hee Chang, Rajiv Y. Ranjan
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Abstract
A perpendicular magnetic recording medium having a substrate, a seedlayer on the substrate and a magnetic underlayer on the seedlayer, the magnetic underlayer having an easy axis of magnetization substantially directed in a radial or transverse direction, and a process for manufacturing the perpendicular magnetic recording medium are disclosed.
Claims22
A recording medium for perpendicular recording comprising a substrate, a non-magnetic seedlayer on the substrate, a soft magnetic underlayer on the seedlayer and a perpendicular magnetic recording layer, the underlayer comprising an easy axis of magnetization directed in a direction substantially transverse to a traveling direction of a magnetic head reading the recording medium, wherein the underlayer without the seedlayer is isotropic and the seedlayer induces anisotropy in the underlayer, said anisotropy being in the easy axis of magnetization directed in the direction substantially transverse to the traveling direction of the magnetic head.
A disk drive comprising a magnetic recording disk for perpendicular recording, wherein the magnetic recording disk comprises a substrate, a non-magnetic seedlayer, a soft magnetic underlayer on the substrate and a perpendicular magnetic recording layer, wherein the underlayer comprises an easy axis of magnetization directed in a radial direction of the magnetic recording disk, wherein the underlayer without the seedlayer is isotropic and the seedlayer induces radial anisotropy in the underlayer.
A magnetic recording disk for perpendicular recording comprising a substrate, a non-magnetic seedlayer on the substrate, a soft magnetic underlayer on the seedlayer and a perpendicular magnetic recording layer, wherein the underlayer without the seedlayer is isotropic and the seedlayer induces radial anisotropy in the underlayer.
Dependencies are inferred from the claim text.