Recording medium

1. A recording medium comprising a substrate, a magnetic material inside the substrate, and a surface layer on the substrate, and having

wherein the Taber abrasion amount of the recording medium is about 10 mg or less;

wherein the magnetic material has a Fe—Co—Si-based amorphous magnetic material as its basic component, and the substrate comprises a fiber obtained by

i) impregnating a pulp fiber with a synthetic resin, or

ii) thermally fusing a synthetic resin into a pulp fiber, wherein

the synthetic resin is selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride and polyester; and the surface layer has a dry mass of about 0.8 to 3.0 g/m 2 containing a material selected from the group consisting of a polyvinyl alcohol having a saponification degree of about 90 mol % or more, a modified polyvinyl alcohol, a styrene-anhydrous maleic acid copolymer, a vinyl chloride-vinyl acetate copolymer, a styrene-butadiene copolymer, and a polyacrylic acid ester.

2. The recording medium of claim 1 , wherein the internal bond strength of the recording medium is about 0.1 N·m or more.

3. The recording medium of claim 1 , wherein the magnetic material exhibits a large Barkhausen effect.

4. The recording medium of claim 3 , wherein the magnetic material is in the shape of a wire having a diameter of about 10 μm or more.

5. The recording medium of claim 4 , wherein the length of the magnetic material is from about 5 mm to about 430 mm.

6. The recording medium of claim 4 , wherein the diameter of the magnetic material is from about 10 μm to about 40 μm.

7. The recording medium of claim 1 , wherein an amount of a filler relative to a solid content of the substrate of the recording medium is about 10% by mass or less.

8. A recording medium comprising a magnetic material, a substrate and a surface layer on the substrate, wherein the Taber abrasion amount of the recording medium is about 10 mg or less, and, in an environment of 23° C. and 50% RH, the surface electroresistivity of the recording medium is about 1×10 9 Ω/sq to 2×10 11 Ω/sq and the volume electroresistivity of the recording medium is about 1×10 10 Ωcm to 2×10 12 Ωcm;

wherein the magnetic material has a Fe—Co—Si-based amorphous magnetic material as its basic component, and the substrate comprises a fiber obtained by

i) impregnating a pulp fiber with a synthetic resin, or

ii) thermally fusing a synthetic resin into a pulp fiber, wherein

the synthetic resin is selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride and polyester; and the surface layer is a surface layer with a dry mass of about 0.8 to 3.0 g/m 2 containing a material selected from the group consisting of a polyvinyl alcohol having a saponification degree of about 90 mol % or more, a modified polyvinyl alcohol, a styrene-anhydrous maleic acid copolymer, a vinyl chloride-vinyl acetate copolymer, a styrene-butadiene copolymer, and a polyacrylic acid ester.

9. The recording medium of claim 8 , wherein an average value R AVE of the surface electroresistivity over the entire surface region of a body of the recording medium, and a surface electroresistivity R1 of a surface of a region of the body of the recording medium that contains the magnetic material have a relationship expressed by the following formula (1): |Log(R1)−Log(R AVE )|≦1.

10. The recording medium of claim 8 , wherein a conditioning moisture content in an environment of 23° C. and 50% RH is from about 5.5% to about 7.5%.

11. The recording medium of claim 8 , wherein the magnetic material exhibits a large Barkhausen effect.

12. The recording medium of claim 11 , wherein the magnetic material is in the shape of a wire having a diameter of about 10 μm or more.

13. The recording medium of claim 12 , wherein the length of the magnetic material is from about 5 mm to about 430 mm.

14. The recording medium of claim 12 , wherein the diameter of the magnetic material is from about 10 μm to about 60 μm.

15. The recording medium of claim 8 , wherein the substrate comprises a pair of substrate sheets and the magnetic material is sandwiched between the pair of substrate sheets.

16. The recording medium of claim 8 , wherein the recording medium is produced by papermaking from paper stock and the magnetic material.