Magnetic recording media for tilted recording
View Patent ↗A recording medium according to the invention has a magnetic recording layer with an L1 0 magnetic material deposited with a (111) preferred orientation and soft underlayer (SUL). One set of embodiments includes an intermediate layer (seed layer or underlayer) between the L1 0 media and SUL. The intermediate layer can be a close-packed surface structure (triangular lattice) to promote (111) orientation of the L1 0 media. For example, the intermediate layer can be a (111) oriented, face-centered-cubic (fcc) material such as platinum, palladium, iridium, rhodium, FePt, FePd, or FePdPt alloys; or the intermediate layer can be a (100) oriented hexagonal-close-packed (hcp) material such as ruthenium, rhenium, or osmium. Alternatively, the intermediate layer can be an amorphous material. The L1 0 recording layer of the invention can be deposited with a matrix material to form grain boundaries and provide magnetic isolation of the grains of L1 0 material.
1. A tilted magnetic recording medium comprising:
a magnetically soft underlayer;
a magnetic layer including an L1 0 magnetic material with a (111) orientation above the magnetically soft underlayer, the magnetic material having an easy axis of switching which is tilted at an oblique angle from a planar surface on which the magnetic material is deposited, the magnetic layer including matrix material at grain boundaries which isolates grains of the L1 0 magnetic material; and
an intermediate layer with a (111) oriented fcc structure between the L1 0 magnetic material and the magnetically soft underlayer.
2. A tilted magnetic recording medium comprising:
a magneticaily soft underlayer;
a magnetic layer including an L1 0 magnetic material with a (111) orientation above the magnetically soft underlayer, the magnetic material having an easy axis of switching which is tilted at an oblique angle from a planar surface on which the magnetic material is deposited, the magnetic layer including matrix material at grain boundaries which isolates grains of the L1 0 magnetic material; and
an intermediate layer between the L1 0 magnetic material and the magnetically soft underlayer, wherein the intermediate layer has a close-packed surface structure with a triangular lattice.
3. A tilted magnetic recording medium comprising:
a magnetically soft underlayer;
an intermediate layer with a (111) oriented fcc structure above the magnetically soft underlayer, the intermediate layer comprised primarily of platinum, palladium, iridium or rhodium; and
an L1 0 magnetic material with a (111) orientalion above the intermediate layer.
4. A tilted magnetic recording medium comprising:
a magnetically soft underlayer;
an intermediate layer with a (111) oriented fcc structure above the magnetically soft underlayer, wherein the intermediate layer is an fcc alloy comprised primarily of Fe, Co, Pd, and Pt; and
an L1 0 magnetic material with a (111) orientation above the intermediate layer.
5. A tilted magnetic recording medium comprising:
a magnetically soft underlayer;
an intermediate layer of an (100) oriented hcp material; and
an L1 0 magnetic material with a (111) orientation above the intermediate layer.
6. The tilted magnetic recording medium of claim 5 wherein the intermediate layer is comprised primarily of ruthenium, rhenium, or osmium.
7. The tilted magnetic recording medium of claim 1 wherein the matrix material at grain boundaries includes SiO x , carbon (C), boron (B), boron nitride (BN), boron carbide (BC), CN, SiN, SiC, yttrium stabilized zirconia (YSZ), AlO, MgO x , Cr, Ag, Au, Cu, or Ta.
8. The tilted magnetic recording medium of claim 1 further comprising a circumferentially textured substrate.
9. The tilted magnetic recording medium of claim 1 further comprising a radially textured substrate.
10. The tilted magnetic recording medium of claim 1 wherein the L1 0 magnetic material is a tetragonal AB material with approximately equiatomic amounts of A and B and where A=(Co, Fe or CoFe) and B=(Pt, Pd or PtPd).
11. The tilted magnetic recording medium of claim 1 wherein the L1 0 magnetic material is a tetragonal AB material with approximately equiatomic amounts of A and B and where A=((Co, Fe or CoFe) with (Ni, Mn or Cu) and B=(Pt, Pd or PtPd).
12. The tilted magnetic recording medium of claim 1 wherein the L1 0 magnetic material has a material composition which is approximately equal to a material composition of the intermediate layer.
13. The tilted magnetic recording medium of claim 1 wherein the intermediate layer is magnetically soft.