Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Reexamination Certificate
2006-08-15
2006-08-15
Dinh, Tan (Department: 2627)
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
C369S013420, C428S690000
Reexamination Certificate
active
07092318
ABSTRACT:
In a magneto-optical recording medium, a first magnetic layer is made of a material using 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 larger than 1, and an element concentration ratio (at. % ratio) of Gd to Fe or Fe—Co is set in a range of 28.0≦Gd≦29.0. A second magnetic layer 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 23.5≦Tb≦25.5 or 25.5≦Dy≦28.5. According to another embodiment, a first magnetic layer is made of a plurality of heavy rare earth and iron family amorphous thin films laminated so that by setting a fixed temperature difference ΔTc as a unit, each Curie temperature can be gradually elevated from a second magnetic layer side.
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Arroyo Teresa M.
Dinh Tan
Kang Gregory B.
Nath & Associates PLLC
Victor Company of Japan , Limited
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