| 摘要 |
PROBLEM TO BE SOLVED: To reduce a stray magnetic field while quickly causing a magnetic domain wall movement. SOLUTION: In the magneto-optical recording medium 10, a first magnetic layer 13 is made of a Gd-Fe film or a Gd-Fe-Co film as a base so that a magnetic field normalized based on saturation magnetization of a magnetic domain wall driving field can be smaller than 1. A second magnetic layer 14 is made of a material using a Tb-Fe film or a Dy-Fe film as a base, to which a nonmagnetic element such as Al or Cr, and Co are added. A third magnetic layer is made of a material using a Tb-Fe-Co film or a Dy-Fe-Co film as a base, and an element concentration ratio (at.% ratio) of Tb or Dy to Fe-Co is set in a range of 24.5≤Tb≤26.5 or 26.5≤Dy≤29.5. Addition amounts of Co and a nonmagnetic element to each magnetic layer are adjusted to set Curie temperatures Tc11, Tc12, and Tc13 of the first, second, and third magnetic layers to Tc13>Tc11>Tc12. COPYRIGHT: (C)2003,JPO
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