Thermally assisted magnetic recording disk with ion-implant facilitated non-magnetic regions, manufacturing method thereof, and magnetic recording method
View Patent ↗The invention provides a magnetic disk that solves (1) a problem of cross-talk that cannot be solved even by an existing thermally assisted recording method or a discrete method (DTM or the like), (2) a problem of surface flatness, which an existing embedding type DTM or the like has, and (3) a problem of a difference in thermal expansion coefficient between materials when a thermally assisted method is applied to the DTM, and that (4) does not necessitate a special medium structure, and is excellent in a surface flatness and economically and functionally high in realizability. A DTM manufactured by ion implantation is excellent in the surface flatness, and can solve the cross-talk problem by conducting the thermally assisted recording at a temperature between a Curie temperature (Tcn) of a portion where ions are implanted (non-recording region) and a Curie temperature (Tcr) of a portion where ions are not implanted (recording region).
1. A thermally assisted magnetic recording disk, comprising:
a substrate;
on at least one surface of the substrate, a magnetic recording layer in which a plurality of magnetic recording regions in the form of tracks for conducting read/write of magnetic information and a plurality of non-recording regions for magnetically separating the magnetic recording regions are regularly disposed in an in-plane direction of the substrate; and in the non-recording regions, one or more kinds of elements of B, P, Si, F, C, In, Bi, Kr, Ar, Xe, W, As, Ge, Mo, Sn, N 2 , O 2 , Ne, He and H 2 are disposed,
wherein said magnetic recording regions are structured and made of materials such that a thermally assisted recording method is effective to record,
wherein one or more kinds of elements of B, P, Si, F, C, In, Bi, Kr, Ar, Xe, W, As, Ge, Mo, Sn, N 2 , O 2 , Ne, He and H 2 disposed in the non-recording regions are elements implanted by ion illumination, and
wherein the coercive force (Hc) in the non-magnetic regions is less than 1000 Oe at temperatures between room temperature and 250° C.
2. The thermally assisted magnetic recording disk according to claim 1 , wherein a Curie temperature (Tcn) of the non-recording regions and a Curie temperature (Tcr) of the recording regions satisfy a relationship of Tcn<Tcr.
3. The thermally assisted magnetic recording disk according to claim 2 , wherein a magnetic anisotropy constant in the magnetic recording regions is 5×10 6 or more.
4. The thermally assisted magnetic recording disk according to claim 3 , wherein the magnetic recording layer contains an FePt alloy layer.
5. The thermally assisted magnetic recording disk according to claim 2 , wherein the magnetic recording layer contains an FePt alloy layer.
6. The thermally assisted magnetic recording disk according to claim 1 , wherein a magnetic anisotropy constant in the magnetic recording regions is 5×10 6 or more.
7. The thermally assisted magnetic recording disk according to claim 6 , wherein the magnetic recording layer contains an FePt alloy layer.
8. The thermally assisted magnetic recording disk according to claim 1 , wherein the magnetic recording layer contains an FePt alloy layer.
9. A thermally assisted magnetic recording disk, comprising:
a substrate;
on at least one surface of the substrate, a magnetic recording layer in which a plurality of magnetic recording regions in the form of tracks for conducting read/write of magnetic information and a plurality of non-recording regions for magnetically separating the magnetic recording regions are regularly disposed in an in-plane direction of the substrate; and in the non-recording regions, one or more kinds of elements of B, P, Si, F, C, In, Bi, Kr, Ar, Xe, W, As, Ge, Mo, Sn, N 2 O 2 , Ne, He and H 2 are disposed,
wherein said magnetic recording regions are structured and made of materials such that a thermally assisted recording method is effective to record,
wherein one or more kinds of elements of B, P, Si, F, C, In, Bi, Kr, Ar, Xe, W, As, Ge, Mo, Sn, N 2 O 2 , Ne, He and H 2 disposed in the non-recording regions are elements implanted by ion illumination, and
wherein when a temperature is raised to about 200° C., a value of Hc in the non-magnetic regions becomes almost zero.
10. The thermally assisted magnetic recording disk according to claim 9 , wherein a Curie temperature (Tcn) of the non-recording regions and a Curie temperature (Tcr) of the recording regions satisfy a relationship of Tcn<Tcr.
11. The thermally assisted magnetic recording disk according to claim 10 , wherein a magnetic anisotropy constant in the magnetic recording regions is 5×10 6 or more.
12. The thermally assisted magnetic recording disk according to claim 11 , wherein the magnetic recording layer contains an FePt alloy layer.
13. The thermally assisted magnetic recording disk according to claim 9 , wherein a magnetic anisotropy constant in the magnetic recording regions is 5×10 6 or more.
14. The thermally assisted magnetic recording disk according to claim 13 , wherein the magnetic recording layer contains an FePt alloy layer.
15. The thermally assisted magnetic recording disk according to claim 9 , wherein the magnetic recording layer contains an FePt alloy layer.