Magnetic material sputtering target and manufacturing method for same

1. A magnetic material sputtering target comprising a metal phase containing Co or Fe, and oxide grains dispersed among the metal phase, wherein, in a plane for observing the oxide in the target, the oxide grains in the target have an average diameter of 1.5 μm or less; and 60% or more of the oxide grains in the observing plane of the target have a difference between a maximum diameter and a minimum diameter of 0.4 μm or less, where the maximum diameter is a maximum distance between arbitrary two points on the periphery of an oxide grain, and the minimum diameter is a minimum distance between two parallel lines across the oxide grain.

2. The magnetic material sputtering target according to claim 1 , wherein metal grains are present in the target among which the oxide grains are dispersed in the metal phase, and one or more of the metal grains in a visual field of 1 mm 2 has a sum of a maximum diameter and a minimum diameter of 30 μm or more, where the maximum diameter is a maximum distance between arbitrary two points on the periphery of a metal grain, and the minimum diameter is a minimum distance between two parallel lines across the metal grain.

3. The magnetic material sputtering target according to claim 2 , wherein the oxide grains present in the target have a maximum diameter of 9 μm or less.

4. The magnetic material sputtering target according to claim 3 , wherein the oxide is one or more oxides selected from SiO 2 , TiO 2 , Ti 2 O 3 , Cr 2 O 3 , Ta 2 O 5 , Ti 5 O 9 , B 2 O 3 , CoO, and CO 3 O 4 ; and the target contains the oxide in an amount of 0.5 to 25 mol %.

5. The magnetic material sputtering target according to claim 4 , wherein the metal phase is composed of 0 mol % or more and 20 mol % or less of Cr, 5 mol % or more and 30 mol % or less of Pt, and the remainder being Co and inevitable impurities.

6. The sputtering target according to claim 4 , wherein the metal phase is composed of exceeding 0 mol % and 60 mol % or less of Pt and the remainder being Fe and inevitable impurities.

7. The magnetic material sputtering target according to claim 4 , wherein the metal phase contains one or more elements selected from Mg, Al, Si, Mn, Nb, Mo, Ru, Pd, Ta, W, B, and Cu in an amount of 0.5 to 12 mol %, and the remainder is Co or Fe and inevitable impurities.

8. The magnetic material sputtering target according to claim 4 , wherein the target has a relative density of 97% or more.

9. The magnetic material sputtering target according to claim 1 , wherein the oxide grains present in the target have a maximum diameter of 9 μm or less.

10. The magnetic material sputtering target according to claim 1 , wherein the oxide is one or more oxides selected from SiO 2 , TiO 2 , Ti 2 O 3 , Cr 2 O 3 , Ta 2 O 5 , Ti 5 O 9 , B 2 O 3 , CoO, and Co 3 O 4 ; and the target contains the oxide in an amount of 0.5 to 25 mol %.

11. The magnetic material sputtering target according to claim 1 , wherein the metal phase is composed of 0 mol % or more and 20 mol % or less of Cr, 5 mol % or more and 30 mol % or less of Pt, and the remainder being Co and inevitable impurities.

12. The sputtering target according to claim 1 , wherein the metal phase is composed of exceeding 0 mol % and 60 mol % or less of Pt and the remainder being Fe and inevitable impurities.

13. The magnetic material sputtering target according to claim 1 , wherein the metal phase contains one or more elements selected from Mg, Al, Si, Mn, Nb, Mo, Ru, Pd, Ta, W, B, and Cu in an amount of 0.5 to 12 mol %, and the remainder is Co or Fe and inevitable impurities.

14. The magnetic material sputtering target according to claim 1 , wherein the target has a relative density of 97% or more.