Substrate for magnetic recording media, magnetic recording media and magnetic recording apparatus
View Patent ↗According to one embodiment, a substrate for a magnetic recording media has circumferential protrusions corresponding to recording tracks and circumferential recesses corresponding to grooves between the recording tracks, in which the substrate satisfying at least one of conditions of (a) a surface of the recess has a surface energy smaller than that of the protrusion, (b) the surface of the recess is modified with a thermally decomposable or deformable substance, (c) the surface of the recess has surface roughness smaller than that of the protrusion, (d) crystal orientation is more disturbed on the surface of the recess than on the protrusion, (e) the surface of the recess is modified with a substance that causes reaction with a magnetic material or that diffuses into the magnetic material, and (f) the surface of the recess is modified with a substance soluble in a solvent or with a deformable substance.
1. A substrate for magnetic recording media on which a granular magnetic layer is to be formed on the substrate, comprising: circumferential protrusions corresponding to recording tracks and circumferential recesses corresponding to grooves between the recording tracks;
where in the recesses have a selectively formed surface modifying layer of a containing an organic fluorine compound, the fluorine compound in the recesses rendering surface energy in the recesses less than surface energy of the protrusions; a magnetic layer in recesses and protrusions where orientation of the magnetic layer formed on the fluorine compound in the recesses have a more disturbed lattice than that formed on the protrusions.
2. The substrate according to claim 1 , wherein the substance containing fluorine is fluoroalkylsilane.
3. The substrate according to claim 1 , wherein the difference in height between the protrusion and the recess ranges between 10 and 100 nm.
4. The substrate according to claim 1 , wherein the substrate is formed of glass or silicon.
5. A magnetic recording media, comprising:
the substrate for a magnetic recording media according to claim 1 ; and
a granular magnetic layer formed on the substrate for the magnetic recording media,
the orientation of the magnetic crystal lattice of the magnetic layer on the recess being more disturbed than that of the magnetic layer on the protrusion.
6. A magnetic recording apparatus, comprising:
the magnetic recording media according to claim 5 ; and
a magnetic head.
7. A discrete track recording media, comprising:
a substrate formed of glass or silicon, the substrate comprising circumferential protrusions corresponding to recording tracks and circumferential recesses corresponding to grooves between the recording tracks, a difference in height between the protrusion and the recess ranging from 10 to 100 nm, a surface of the recess being modified with an organic compound substance containing fluorine rendering surface energy in the recesses less than surface energy of the protrusions; and a granular magnetic layer formed on the substrate, the orientation of the magnetic crystal lattice of the magnetic layer on the recess being more disturbed than that of the magnetic layer on the protrusion.