Magnetic recording medium, method for manufacturing recording medium and magnetic recording apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsTomoyuki Maeda, Akira Kikitsu, Soichi Oikawa, Takeshi Iwasaki
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Abstract
A magnetic recording layer is formed on an under-layer comprising a Cu crystalline grain layer and a deposited nitrogen atom layer on the Cu crystalline grain layer surface. Then the magnetic recording layer comprising very small average grain diameter and sharp grain diameter distribution is obtained. The magnetic recording medium comprising the magnetic recording layer shows excellent signal to noise ratio at high density recording.
Claims21
A magnetic recording medium, comprising:
- a substrate;
- an under-layer formed on the substrate;
- a magnetic recording-layer on the under-layer;
- and
- a protective-layer formed on the magnetic recording-layer,
- wherein the under-layer including a grain diameter control layer comprises Cu crystalline grains, and a deposited layer of nitrogen atoms formed on the grain diameter control under-layer surface.
A method for producing magnetic recording medium, comprising:
- a process for forming a grain diameter control layer comprising Cu crystalline grains on a substrate;
- a process for forming a deposited layer of nitrogen atoms depositing nitrogen on the grain diameter control under-layer surface;
- and
- a process for forming a magnetic recording-layer on the substrate having the nitrogen-layer deposited grain diameter control under-layer.
A magnetic recording and reproducing apparatus, comprising:
- a magnetic recording medium comprising:
- a substrate;
- an under-layer formed on the substrate;
- a magnetic recording-layer on the under-layer;
- and
- a protective-layer formed on the magnetic recording-layer;
- wherein the under-layer comprising a grain diameter control under-layer comprising Cu crystalline grains and a deposited layer of nitrogen atoms formed on the grain diameter control under-layer,
- a recording medium driving mechanism, driving the magnetic recording medium;
- a recording and reproducing head mechanism, recording information to the magnetic recording medium and reproducing from the magnetic recording medium;
- a head driving mechanism, driving the recording and reproducing head;
- and
- a recording and reproducing signal processing system, processing recording signals and reproducing signals.
Dependencies are inferred from the claim text.