Magnetic recording medium and method of manufacturing the same
AssigneeKabushiki Kaisha Toshiba
InventorHiroyuki Hieda
Life of this patent
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Abstract
According to one embodiment, a magnetic recording medium includes a data region and a servo region adjacent to the data region and including a magnetic recording layer, the magnetic recording layer including first and second patterned regions adjacent to each other, the first patterned region including a first nonmagnetic matrix and first magnetic particles dispersed in the first nonmagnetic matrix and having magnetization oriented in a first direction, the second patterned region includes a second nonmagnetic matrix and second magnetic particles dispersed in the second nonmagnetic matrix and having magnetization oriented in a second direction opposite to the first direction, sizes of the first magnetic particles being smaller than sizes of the second magnetic particles.
Claims16
A magnetic recording medium, comprising:
- a data region;
- and
- a servo region adjacent to the data region and including a magnetic recording layer, wherein the magnetic recording layer comprises first and second patterned regions adjacent to each other, the first patterned region comprises a first nonmagnetic matrix and first magnetic particles dispersed in the first nonmagnetic matrix and has magnetization oriented in a first direction, the second patterned region comprises a second nonmagnetic matrix and second magnetic particles dispersed in the second nonmagnetic matrix and has magnetization oriented in a second direction opposite to the first direction, and sizes of the first magnetic particles are smaller than sizes of the second magnetic particles.
A magnetic recording medium, comprising:
- an underlayer;
- an interlayer formed on the underlayer, wherein the interlayer comprises first and second regions adjacent to each other, the first region has holes that pass from a surface of the underlayer to a surface of the interlayer, and the second region has a flat surface;
- first magnetic particles formed on the first region of the underlayer, wherein the first magnetic particles comprise easy axes of magnetization;
- a first nonmagnetic matrix formed on the first region and surrounding the first magnetic particles;
- and
- a non-oriented part formed on the second region, wherein the non-oriented part comprises a nonmagnetic material and a magnetic material, and the magnetic material has an easy axis of magnetization different from easy axes of magnetization of the first magnetic particles.
A method of manufacturing a magnetic recording medium, comprising:
- forming a resist layer on an underlayer;
- imprinting a stamper having a concavo-convex pattern on the resist layer to transfer the concavo-convex pattern onto a surface of the resist layer;
- forming a region having protrusions and a region having a flat surface to the underlayer by etching the underlayer with use of the patterned resist layer as a mask;
- removing the resist layer from the underlayer;
- and
- forming a magnetic recording layer on the underlayer.
A method of manufacturing a magnetic recording medium, comprising:
- forming an interlayer on an underlayer, the interlayer including first and second regions adjacent to each other and made of oxide(s), nitride(s) or organic substance(s);
- forming a resist layer on the interlayer;
- imprinting a stamper having a concavo-convex pattern on the resist layer to transfer the concavo-convex pattern onto a surface of the resist layer;
- etching the interlayer using the patterned resist layer as a mask to form holes that pass from a top-surface of the interlayer to a bottom-surface of the interlayer in the first region;
- removing the resist layer from the interlayer to form the holes and to form a flat surface on in the second region;
- and
- forming a magnetic recording layer on the first region and the second region.
Dependencies are inferred from the claim text.