Magnetic recording medium, recording apparatus, and method and apparatus for manufacturing magnetic recording medium
A magnetic recording medium includes a substrate, an underlayer of a chromium alloy formed on the substrate, a ferromagnetic layer formed on the underlayer, a spacer layer formed on the ferromagnetic layer, and a recording layer of a cobalt-chromium alloy formed on the spacer layer. The spacer layer is formed with a ruthenium-cobalt-based alloy.
1 . A magnetic recording medium comprising:
a substrate;
an underlayer of a chromium alloy formed on the substrate;
a ferromagnetic layer formed on the underlayer;
a spacer layer formed on the ferromagnetic layer; and
a recording layer of a cobalt-chromium alloy formed on the spacer layer, wherein
the spacer layer is formed with a ruthenium-cobalt-based alloy.
2 . The magnetic recording medium according to claim 1 , wherein the spacer layer contains 40% to 80% of cobalt.
3 . The magnetic recording medium according to claim 1 , wherein a thickness of the spacer layer is in a range from 0.3 nanometer to 2 nanometers.
4 . The magnetic recording medium according to claim 1 , wherein a crystal lattice size of the spacer layer is equal to or larger than that of the ferromagnetic layer and equal to or smaller than that of the recording layer.
5 . A recording apparatus comprising:
a magnetic recording medium that includes
a substrate,
an underlayer of a chromium alloy formed on the substrate,
a ferromagnetic layer formed on the underlayer,
a spacer layer of a ruthenium-cobalt-based alloy formed on the ferromagnetic layer, and
a recording layer of a cobalt-chromium alloy formed on the spacer layer; and
a magnetic head that performs reading or writing of magnetic data with respect to the magnetic recording medium.
6 . A method of manufacturing a magnetic recording medium comprising:
forming an underlayer by coating a chromium alloy film on a substrate;
forming a ferromagnetic layer on the underlayer;
forming a spacer layer by coating a ruthenium-cobalt-based alloy film on the ferromagnetic layer; and
forming a recording layer by coating a cobalt-chromium alloy film on the spacer layer.
7 . An apparatus for manufacturing a magnetic recording medium by sequentially forming an underlayer of a chromium alloy, a ferromagnetic layer, a spacer layer, and a recording layer of a cobalt-chromium alloy on a substrate, wherein the spacer layer is made of a ruthenium-cobalt-based alloy.