| 摘要 |
A magnetic recording-reproducing apparatus has a magnetic recording medium having a nonmagnetic substrate, and a functional layer and a recording layer formed on the nonmagnetic substrate, the recording layer exhibiting a magnetic anisotropy energy density Ku<SUB>RL</SUB>, the functional layer developing ferromagnetism upon irradiation with light so as to exhibit a magnetic anisotropy energy density Ku<SUB>FL </SUB>lower than the magnetic anisotropy energy density Ku<SUB>RL </SUB>and the functional layer serving to lower the magnetic anisotropy energy density of the recording layer through exchange coupling interaction with the recording layer when the functional layer is irradiated with light, a light source which irradiates the functional layer with light, and a magnetic head having a writing head writing signal magnetization by applying a magnetic field to the recording layer and a reading head reading the signal magnetization recorded in the recording layer.
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