Magnetic recording medium, sputtering target, sputtering target manufacturing method, and magnetic storage apparatus
A magnetic recording medium includes a substrate, an underlayer provided on the substrate, and a magnetic layer provided on the underlayer and having a L1 0 structure and a (001) orientation. The magnetic layer has a granular structure in which an organic compound having a methylene skeleton or a methine skeleton is arranged at grain boundaries of magnetic grains.
1. A magnetic recording medium comprising:
a substrate;
an underlayer provided on the substrate; and
a magnetic layer, provided on the underlayer, and having a L1 0 structure and a (001) orientation caused by the underlayer,
wherein the magnetic layer has a granular structure in which an organic compound having a first skeleton or a second skeleton is arranged at grain boundaries of magnetic grains,
wherein the first skeleton refers to skeletons represented by
and the second skeleton refers to skeletons represented by
and
wherein the organic compound is a nitrogen-including organic compound selected from a group consisting of melamine resin, and a compound including an amide linkage or an urethane linkage.
2. The magnetic recording medium as claimed in claim 1 , wherein a content of the organic compound having the first skeleton or the second skeleton in the magnetic layer is 0.5 vol % or greater and 40 vol % or less.
3. The magnetic recording medium as claimed in claim 1 , wherein the magnetic layer has a thickness of 1 nm or greater and 7 nm or less.
4. The magnetic recording medium as claimed in claim 1 , wherein the magnetic grains include an FePt alloy or a CoPt alloy.
5. The magnetic recording medium as claimed in claim 3 , wherein the magnetic grains include an FePt alloy or a CoPt alloy.
6. A magnetic storage apparatus comprising:
a magnetic recording medium according to claim 1 ; and
a magnetic head configured to record signals on and reproduce signals from the magnetic recording medium according to a heat assisted magnetic recording method.
7. The magnetic recording medium as claimed in claim 1 , wherein the organic compound having the first skeleton or the second skeleton has a thermal conductivity of 0.7 W/(m·k) or lower.
8. A magnetic recording medium comprising:
a substrate;
an underlayer provided on the substrate; and
a magnetic layer provided on the underlayer and having a L1 0 structure and a (001) orientation caused by the underlayer,
wherein the magnetic layer has a granular structure in which a nitrogen-including organic compound having a first skeleton or a second skeleton is arranged at grain boundaries of magnetic grains,
wherein the first skeleton refers to skeletons represented by
and the second skeleton refers to skeletons represented by
wherein a content of the nitrogen-including organic compound having the first skeleton or the second skeleton in the magnetic layer is 0.5 vol % or greater and 40 vol % or less, and
wherein the nitrogen-including organic compound is polyimide.
9. The magnetic recording medium as claimed in claim 8 , wherein the nitrogen-including organic compound having the first skeleton or the second skeleton has a thermal conductivity of 0.7 W/(m·k) or lower.