Magnetic recording device, recording device, and reproducing device
AssigneeSharp Kabushiki Kaisha
InventorsKazuhisa Takayama, Hiroshi Fuji, Jyunichi Satoh, Kunio Kojima, Akira Takahashi
Life of this patent
Estimating the term…
Abstract
A magnetic recording medium which includes a first magnetic layer on a substrate is provided with a second magnetic layer having a greater largest possible absolute value of magnetization than the first magnetic layer within a temperature range of from a room temperature to a Curie temperature, and a metal layer made of metal having unspontaneous magnetization property. With this, it is possible to provide a magnetic recording medium having improved coersivity so as to realize stable recording and reproducing even if the size of a record unit is small.
Claims18
A magnetic recording medium, comprising:
- a substrate;
- a metal layer formed on said substrate, said metal layer having unspontaneous magnetization property;
- a first magnetic layer formed on said metal layer;
- and
- a second magnetic layer formed on said first magnetic layer, said second magnetic layer having a greater largest possible absolute value of magnetization than said first magnetic layer within a temperature range of from a room temperature to a Curie temperature.
A magnetic recording medium which includes a substrate and a first magnetic layer, comprising:
- a second magnetic layer having a greater largest possible absolute value of magnetization than said first magnetic layer within a temperature range of from a room temperature to a Curie temperature;
- and
- a metal layer made of metal having unspontaneous magnetization property.
A recording device, comprising:
- heating means for locally heating a portion of a magnetic recording medium including a substrate, a first magnetic layer, a second magnetic layer having a greater largest possible absolute value of magnetization than said first magnetic layer within a temperature range of from a room temperature to a Curie temperature, and a metal layer made of metal having unspontaneous magnetization property;
- and
- a magnetic head for applying a magnetic field on the portion heated by said heating means.
A reproducing device, comprising:
- heating means for locally heating a portion of a magnetic recording medium including a substrate, a first magnetic layer, a second magnetic layer having a greater largest possible absolute value of magnetization than said first magnetic layer within a temperature range of from a room temperature to a Curie temperature, and a metal layer made of metal having unspontaneous magnetization property;
- and
- a magnetic head for detecting magnetization of the portion heated by said heating means.
Dependencies are inferred from the claim text.