Heat-assisted magnetic recording medium and magnetic storage apparatus

1. A heat-assisted magnetic recording medium comprising:

a substrate;

an underlayer; and

a magnetic layer that is (001)-oriented,

wherein in the magnetic layer, a first magnetic layer and a second magnetic layer are stacked in this order from the underlayer side,

wherein the first magnetic layer and the second magnetic layer include an alloy having an L1 0 structure,

wherein the second magnetic layer includes a ferrite at grain boundaries of magnetic grains,

wherein the ferrite is one or more kinds selected from the group consisting of NiFe 2 O 4 , MgFe 2 O 4 , MnFe 2 O 4 , CuFe 2 O 4 , ZnFe 2 O 3 , CoFe 2 O 4 , BaFe 2 O 4 , SrFe 2 O 4 , and Fe 3 O 4 , and

wherein a Curie temperature of the magnetic grains is lower than a Curie temperature of the ferrite.

2. The heat-assisted magnetic recording medium according to claim 1 ,

wherein the first magnetic layer has a thickness in a range of 0.3 nm to 5.0 nm, and

wherein the second magnetic layer has a thickness in a range of 1.0 nm to 10.0 nm.

3. The heat-assisted magnetic recording medium according to claim 1 , wherein the second magnetic layer further includes, at the grain boundaries of the magnetic grains, a substance selected from the group consisting of C, SiC, VC, B 4 C, Si 3 N 4 , VN, BN, TiN, and AlN.

4. The heat-assisted magnetic recording medium according to claim 1 , wherein in the second magnetic layer, a content of the ferrite is in a range of 0.5% by volume to 60% by volume.

5. The heat-assisted magnetic recording medium according to claim 1 , wherein the alloy having the L1 0 structure is a Fe—Pt alloy or a Co—Pt alloy.

6. A magnetic storage apparatus comprising:

the heat-assisted magnetic recording medium according to claim 1 .