US 6,583,957 B1 · Magnetic hard disk having concentric magnetic tracks with flat surface and fabrication method thereof

Abstract

A magnetic hard disk has magnetic tracks for storing data, which is read or written by a magnetic head floating immediately above the magnetic track while the magnetic hard disk is rotating. The magnetic head rests on the magnetic hard disk while the magnetic hard disk is not rotating. The magnetic hard disk comprises a non-magnetic substrate having a plurality of banks and grooves alternately and concentrically arranged thereon, a magnetic film formed on each of the banks, and a non-magnetic material formed on an entire surface of the substrate all over the banks and grooves such that roughness of the upper surface of the non-magnetic material is in a range between 0.5 nm and 3 nm.

Claims15

Dependent claims

A magnetic hard disk rotatable around a center of the disk having a plurality of magnetic tracks concentrically, disposed around the center of the disk and spaced to each other, the magnetic hard disk comprising:

a substrate made of non-magnetic or antiferro-magnetic material having an upper surface;
a magnetic film patterned concentrically around the center of said substrate on the upper surface to form the magnetic tracks having a space between each pair of the magnetic tracks adjacent to each other;
and
a non-magnetic film continuously formed on both said magnetic film and the space such that an upper surface of said non-magnetic film is substantially in a plane parallel to a plane of rotation of the magnetic hard disk, wherein the roughness of the upper surface of said non-magnetic film is in a range between 0.5 nm and 3 nm.

1 more element

Dependencies are inferred from the claim text.

Magnetic hard disk having concentric magnetic tracks with flat surface and fabrication method thereof

Life of this patent

Magnetic hard disk having concentric magnetic tracks with flat surface and fabrication method thereof

Life of this patent

Abstract

Claims15