Magnetic recording medium and magnetic storage apparatus
A magnetic recording medium includes: a substrate; a first underlayer; a second underlayer; and a magnetic layer including an alloy having a L1 0 type crystal structure with a (001) orientation. The substrate, the first underlayer the second underlayer, and the magnetic layer are stacked in this order. The first underlayer is a crystalline layer that includes W as a main component. The second underlayer is a crystalline layer that includes a material containing W as a main component and that includes an oxide. The content of the oxide in the second underlayer is in a range of from 2 mol % to 30 mol %. The oxide is an oxide of one or more kinds of elements selected from a group consisting of Cr, Mo, Nb, Ta, V, and W.
1. A magnetic recording medium comprising:
a substrate;
a first underlayer;
a second underlayer; and
a magnetic layer including an alloy having a L1 0 type crystal structure with a (001) orientation,
wherein the substrate, the first underlayer the second underlayer, and the magnetic layer are stacked in this order,
wherein the first underlayer is a crystalline layer that includes W as a main component,
wherein the second underlayer is a crystalline layer that includes a material containing W as a main component and that includes an oxide, a content of the oxide in the second underlayer being in a range of from 2 mol % to 30 mol %, and
wherein the oxide is an oxide of W.
2. The magnetic recording medium according to claim 1 , further comprising:
a barrier layer between the second underlayer and the magnetic layer,
wherein the barrier layer includes one or more compounds selected from a group consisting of MgO, TiO, NiO, TiN, TaN, HfN, NbN, ZrC, HfC, TaC, NbC, and TiC, and has a NaCl type structure.
3. The magnetic recording medium according to claim 1 , further comprising:
an orientation control layer between the substrate and the first underlayer,
wherein the orientation control layer is a Cr layer having a BCC structure, an alloy layer containing Cr as a main component and having a BCC structure, or an alloy layer having a B2 structure.
4. A magnetic storage apparatus comprising the magnetic recording medium according to claim 1 .
5. A magnetic recording medium comprising:
a substrate;
a first underlayer;
a second underlayer; and
a magnetic layer including an alloy having a L1 0 type crystal structure with a (001) orientation,
wherein the substrate, the first underlayer the second underlayer, and the magnetic layer are stacked in this order,
wherein the first underlayer is a crystalline layer that includes W as a main component,
wherein the second underlayer is a crystalline layer that includes a material containing W as a main component and that includes an oxide of W, a content of the oxide in the second underlayer being in a range of from 2 mol % to 30 mol %.