Magnetic recording medium having characterized magnetic layer, and magnetic recording and reproducing apparatus
The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which a difference (S 0.5 −S 13.5 ) between a spacing S 0.5 measured on a surface of the magnetic layer by optical interferometry after n-hexane cleaning under a pressure of 0.5 atm and a spacing S 13.5 measured on the surface of the magnetic layer by optical interferometry after n-hexane cleaning under a pressure of 13.5 atm is 9.0 nm or more.
1. A magnetic recording medium comprising:
a non-magnetic support; and
a magnetic layer including ferromagnetic powder,
wherein a difference S 0.5 −S 13.5 between a spacing S 0.5 measured on a surface of the magnetic layer by optical interferometry after n-hexane cleaning under a pressure of 0.5 atm and a spacing S 13.5 measured on the surface of the magnetic layer by optical interferometry after n-hexane cleaning under a pressure of 13.5 atm is 9.0 nm or more.
2. The magnetic recording medium according to claim 1 ,
wherein the difference is 9.0 nm or more and 30.0 nm or less.
3. The magnetic recording medium according to claim 1 ,
wherein the difference is 10.0 nm or more and 30.0 nm or less.
4. The magnetic recording medium according to claim 1 ,
wherein the magnetic layer includes an organic resin particle.
5. The magnetic recording medium according to claim 1 ,
wherein the magnetic layer includes a compound which contains an alkyl group having 5 or more carbon atoms.
6. The magnetic recording medium according to claim 5 ,
wherein the compound is an organic amine compound.
7. The magnetic recording medium according to claim 5 ,
wherein the compound is an organic phosphorus compound.
8. The magnetic recording medium according to claim 1 ,
wherein the magnetic layer includes one or more lubricants selected from the group consisting of a fatty acid, a fatty acid ester, and a fatty acid amide.
9. The magnetic recording medium according to claim 1 , further comprising:
a non-magnetic layer including non-magnetic powder between the non-magnetic support and the magnetic layer.
10. The magnetic recording medium according to claim 1 , further comprising:
a back coating layer including non-magnetic powder on a surface side of the non-magnetic support opposite to a surface side provided with the magnetic layer.
11. The magnetic recording medium according to claim 1 , which is a magnetic tape.
12. A magnetic recording and reproducing apparatus comprising:
the magnetic recording medium according to claim 1 ; and
a magnetic head.
13. The magnetic recording and reproducing apparatus according to claim 12 ,
wherein the difference is 9.0 nm or more and 30.0 nm or less.
14. The magnetic recording and reproducing apparatus according to claim 12 ,
wherein the difference is 10.0 nm or more and 30.0 nm or less.
15. The magnetic recording and reproducing apparatus according to claim 12 ,
wherein the magnetic layer includes an organic resin particle.
16. The magnetic recording and reproducing apparatus according to claim 12 ,
wherein the magnetic layer includes a compound which contains an alkyl group having 5 or more carbon atoms.
17. The magnetic recording and reproducing apparatus according to claim 16 ,
wherein the compound is an organic amine compound.
18. The magnetic recording and reproducing apparatus according to claim 16 ,
wherein the compound is an organic phosphorus compound.
19. The magnetic recording and reproducing apparatus according to claim 12 ,
wherein the magnetic layer includes one or more lubricants selected from the group consisting of a fatty acid, a fatty acid ester, and a fatty acid amide.