Magnetic recording medium
A magnetic recording medium comprising: a non-magnetic support; and a magnetic layer comprising a hexagonal ferrite and a binder, wherein the magnetic layer has a thickness of from 30 to 100 nm, a coercive force of from 3,000 to 4,200 Oe and a magnetization reversal volume of from 3×10 −18 to 10×10 −18 mL, and the hexagonal ferrite has a tabular ratio of from 2 to 3.
1 . A magnetic recording medium comprising: a non-magnetic support; and a magnetic layer comprising a hexagonal ferrite and a binder, wherein the magnetic layer has a thickness of from 30 to 100 nm, a coercive force of from 3,000 to 4,200 Oe and a magnetization reversal volume of from 1×10 −18 to 10×10 −18 mL, and the hexagonal ferrite has a tabular ratio of from 2 to 3.
2 . The magnetic recording medium according to claim 1 , which further comprises a non-magnetic layer between the non-magnetic support and the magnetic layer, the non-magnetic layer comprising non-magnetic powder and a binder.
3 . The magnetic recording medium according to claim 2 , wherein the non-magnetic layer has a thickness of from 0.5 to 2.0 μm.
4 . The magnetic recording medium according to claim 2 , wherein the non-magnetic layer has a thickness of from 0.8 to 1.5 μm.
5 . The magnetic recording medium according to claim 2 , wherein the non-magnetic layer has a thickness of from 0.8 to 1.2 μm.
6 . The magnetic recording medium according to claim 2 , wherein the non-magnetic powder has a mean particle size of from 5 nm to 2 μm.
7 . The magnetic recording medium according to claim 2 , wherein the non-magnetic powder has a mean particle size of from 10 nm to 200 nm.
8 . The magnetic recording medium according to claim 2 , wherein the non-magnetic layer further comprises carbon black.
9 . The magnetic recording medium according to claim 1 , wherein the magnetic layer has a thickness of from 40 to 80 nm.
10 . The magnetic recording medium according to claim 1 , wherein the magnetic layer has a coercive force of from 3,200 to 4,000 Oe.
11 . The magnetic recording medium according to claim 1 , wherein the magnetic layer has a magnetization reversal volume of from 3×10 −18 to 7×10 −18 mL.
12 . The magnetic recording medium according to claim 1 , wherein the hexagonal ferrite has a tabular ratio of from 2 to 2.5.
13 . The magnetic recording medium according to claim 1 , wherein the hexagonal ferrite contains Ba and Fe at a ratio of Ba to Fe of from 0.075 to 0.085.
14 . The magnetic recording medium according to claim 1 , wherein the magnetic layer further comprises carbon black.