Low power thermally assisted data recording media
In some embodiments, a thermally assisted data recording medium has a recording layer formed of iron (Fe), platinum (Pt) and a transition metal T selected from a group consisting of Rhodium (Rh), Ruthenium (Ru), Osmium (Os) and Iridium (Ir) to substitute for a portion of the Pt content as Fe Y Pt Y-X T X with Y in the range of from about 20 at % to about 80 at % and X in the range of from about 0 at % to about 20 at %.
1. An apparatus comprising a thermally assisted data recording medium with a multi-layer recording structure comprising first, second, and third recording layers each formed of a common composition of iron (Fe), platinum (Pt) and a transition metal T selected from a group consisting of Ruthenium (Ru), Osmium (Os) and Iridium (Ir) to substitute for a portion of the Pt content as Fe Y Pt Y-X T X with Y in a range from about 20 at % to no more than 50 at % and X in a range from greater than 0 at % to about 20 at %, the first recording layer having a greater value for X than the second and third recording layers, the second recording layer having a greater value for X than the third recording layer.
2. The apparatus of claim 1 , wherein each recording layer is formed of Fe 50 Pt 50-X Os X .
3. The apparatus of claim 2 , wherein X is greater than 0 at % to about 15 at %.
4. The apparatus of claim 2 , wherein X is from about 1 at % to about 20 at %.
5. The apparatus of claim 2 , wherein X is from about 1 at % to about 5 at %.
6. The apparatus of claim 1 , wherein the first recording layer is positioned between a carbon overcoat layer closer to an air bearing surface and the second recording layer.
7. The apparatus of claim 1 , wherein the first, second, and third recording layers are each formed of Fe 50 Pt 50-X Os X where the first recording layer uses a first value of X in a range from 15 at % to about 20 at %, the second recording layer uses a different, second value of X in a range from greater than 0 at % to about 20 at %, and the third recording layer uses a different third value of X in a range of greater than 0 at % to about 20 at %.
8. The apparatus of claim 7 , wherein the first value of X is at least about twice the second value of X.
9. The apparatus of claim 1 , wherein the second recording layer is disposed between and contacting the first and third recording layers.
10. A data recording medium comprising:
a substrate; and
a thermally assisted data recording structure separated from the substrate by a soft magnetic underlayer, the thermally assisted data recording structure comprising first, second, and third recording layers each formed of Fe 50 Pt 50-X Os X , where X is different for the first, second, and third recording layers and in a range from greater than 0 at % to about 20 at %.
11. The data recording medium of claim 10 , wherein X is greater than 0 at % to about 5 at %.
12. The data recording medium of claim 10 , wherein X is in the range from about 5 at % to about 20 at %.
13. The data recording medium of claim 10 , wherein the second recording layer is disposed between and contacting the first recording layer and third recording layer.
14. The data recording medium of claim 10 , wherein the second recording layer has a greater value for X than the first recording layer and a lesser value for X than the third recording layer.
15. The data recording medium of claim 14 , wherein the first recording layer has a value for X of 20 at %.
16. The data recording medium of claim 14 , characterized as a heat assisted magnetic recording (HAMR) medium.
17. The data recording medium of claim 10 , wherein the value for X successively increases from the first recording layer through the second recording layer to the third recording layer.
18. A data recording medium comprising a substrate and a multi-layer recording structure positioned atop the substrate, the multi-layer recording structure comprising first, second, and third recording layers, each recording layer having a different material composition of Fe Y Pt Y-X T X with T selected from a group consisting of Rh, Ru, Os and Ir, Y is in a range from about 20 at % to no greater than 50 at % and X is in a range from greater than 0 at % to about 20 at %, the first, second, and third recording layers having successively greater values for X.
19. The data recording medium of claim 18 , wherein the material composition of the second recording layer is Fe 50 Pt 50-X Ir X , where X is in the range from greater than 0 at % to about 20 at %.
20. The data recording medium of claim 18 , wherein the material composition of the first recording layer is Fe 50 Pt 50-X Os X , where X is in a range from greater than 0 at % to 5 at % and the material composition of the second recording layer is Fe 50 Pt 50-X Rh X , where X of the second recording layer is in a range from 6 at % to 20 at %.