Magnetic recording medium having characterized magnetic layer
The magnetic recording medium includes a magnetic layer containing ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio of a peak intensity of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a coefficient of friction measured in a base material portion within a surface of the magnetic layer is equal to or lower than 0.30.
1. A magnetic recording medium comprising:
a non-magnetic support; and
a magnetic layer which is provided on the support and contains ferromagnetic powder and a binder,
wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0,
a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and
a coefficient of friction measured in a base material portion within a surface of the magnetic layer is equal to or lower than 0.30.
2. The magnetic recording medium according to claim 1 ,
wherein the squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or lower than 0.90.
3. The magnetic recording medium according to claim 1 ,
wherein the coefficient of friction measured in a base material portion within a surface of the magnetic layer is equal to or higher than 0.15 and equal to or lower than 0.30; and
the coefficient of friction on the base portion is determined using a spherical indentor at a load of 100 micro-Newton and a speed of 1 micron/s on three random portions of the base portion, calculating the coefficient of friction μ from the formula μ=F/N, where F is the frictional force in Newtons and N is the normal force in Newtons, and adopting the arithmetic average of the three measured values obtained as the coefficient of friction measured on the base portion.
4. The magnetic recording medium according to claim 2 ,
wherein the coefficient of friction measured in a base material portion within a surface of the magnetic layer is equal to or higher than 0.15 and equal to or lower than 0.30; and
the coefficient of friction on the base portion is determined using a spherical indentor at a load of 100 micro-Newton and a speed of 1 micron/s on three random portions of the base portion, calculating the coefficient of friction μ from the formula μ=F/N, where F is the frictional force in Newtons and N is the normal force in Newtons, and adopting the arithmetic average of the three measured values obtained as the coefficient of friction measured on the base portion.
5. The magnetic recording medium according to claim 1 , further comprising:
a non-magnetic layer containing non-magnetic powder and a binder between the non-magnetic support and the magnetic layer.
6. The magnetic recording medium according to claim 1 , further comprising:
a back coating layer containing non-magnetic powder and a binder on a surface, which is opposite to a surface provided with the magnetic layer, of the non-magnetic support.
7. The magnetic recording medium according to claim 1 , which is a magnetic tape.