Absorption enhanced media for energy assisted magnetic recording
View Patent ↗A magnetic recording media is disclosed. The media comprises a substrate, a recording layer disposed over the substrate, and a metallic layer disposed between the recording layer and the substrate. The recording layer is configured to receive an electromagnetic radiation, absorb a first portion of the electromagnetic radiation, and transmit a second portion of the electromagnetic radiation. The metallic layer comprises a non-magnetic metal and configured to reflect at least some of the second portion of the electromagnetic radiation towards the recording layer.
1. A magnetic recording media, comprising:
a substrate;
a recording layer disposed over the substrate and configured to:
receive an electromagnetic radiation,
absorb a first portion of the electromagnetic radiation, and
transmit a second portion of the electromagnetic radiation; and
a metallic layer disposed between the recording layer and the substrate, the metallic layer comprising a non-magnetic metal and configured to reflect at least some of the second portion of the electromagnetic radiation towards the recording layer,
wherein a third portion of the reflected electromagnetic radiation is absorbed by a region of the recording layer.
2. The media of claim 1 , wherein the first portion and the third portion heat the region to reduce the coercivity thereof during a write operation.
3. The media of claim 1 further comprising a crystallization orientation control layer disposed between the recording layer and the metallic layer, and a magnetic interlayer disposed between the metallic layer and the substrate.
4. The media of claim 1 further comprising an overcoat layer disposed over the recording layer.
5. The media of claim 4 , wherein the overcoat layer comprises diamond-like carbon (DLC).
6. The media of claim 4 , wherein the overcoat layer comprises a dielectric material having a refractive index greater than 1.5.
7. The media of claim 6 , wherein the dielectric material is AlN or Si 2 N 4 .
8. The media of claim 6 , wherein the non-magnetic metal is selected from a group consisting of one or more of Au, Ag, Al, and Cu.
9. A magnetic recording media, comprising:
a substrate;
a recording layer disposed over the substrate and configured to:
receive an electromagnetic radiation,
absorb a first portion of the electromagnetic radiation, and
transmit a second portion of the electromagnetic radiation; and
a metallic layer disposed between the recording layer and the substrate, the metallic layer comprising a non-magnetic metal and configured to reflect at least some of the second portion of the electromagnetic radiation towards the recording layer,
wherein the electromagnetic radiation comprises electromagnetic energy from a near field transducer (NFT) of an energy assisted magnetic recording (EAMR) head disposed over the media,
wherein the electromagnetic energy has a power in the range between about 0.1 to 0.5 mW and a wavelength in the range between about 600 to 1000 nm.
10. The media of claim 1 , wherein the recording layer comprises FePt.
11. The media of claim 10 , wherein the recording layer further comprises SiO 2 or C.
12. The media of claim 1 , wherein the metallic layer has a thickness that is about a skin depth of the non-magnetic metal at a wavelength of the electromagnetic radiation.
13. The media of claim 1 , wherein the metallic layer has a thickness in the range between about 10 to 30 nm.
14. The media of claim 1 , wherein the recording layer has a thickness in the range between about 5 to 10 nm.