High density recording on magnetically induced super resolution disk with magnetic field modulation and pulsed laser irradiation

Interfacial magnetic coupling, transient thermal response, and carrier and noise levels are investigated for two central aperture detection magnetic super-resolution disks. In one of the disks, the two magnetic layers are exchange-coupled, while in the other the coupling is of magneto-static nature. For the exchange-coupled disk, the coupling between the two magnetic layers is fairly strong, and the Kerr loop of the readout layer does not have a square shape. For the magneto-statically coupled disk, the strength of coupling depends on the nonuniformity of the magnetization of the storage layer. The readout layer has a square Kerr loop, but its perpendicular magnetization in the hot region under the focused spot has random orientation if the stray field from the storage layer is weak. This random orientation of magnetization within the readout layer gives rise to a high level of noise during readout.

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Magnetic expansion read-out of MSR disk with double in-plane magnetic layers

Yamaguchi

Suzuki

Tanase

et al. 1997

IEEE Trans. Magn.

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The magnetic domain expansion disk with double in-plane layers was prepared and its magnetic domain expansion read-out characteristics were measured. The fiim mainly consists of GdFeCo read-out layer, GdFeCo intermediate layer and TbFeCo memory layer, Given a difference in content of the GdFeCo readout and intermediate layers, it is clearly observed that there exists a threshold read-out laser power. When 0.6 1 1 m continuous domains were recorded on the magnetic expansion disk, the read-out signal level became about 2 times higher than that of a conventional CAD(Center Aperture Detection) disk without an external magnetic field.

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High density recording on magnetically induced super resolution disk with magnetic field modulation and pulsed laser irradiation

Cited by 10 publications

References 4 publications

Optical Super-Resolution Pickup Using a Liquid Crystal Shutter for CAD-MSR Magnetooptical Disk

Optical Super-Resolution Pickup Using a Liquid Crystal Shutter for CAD-MSR Magnetooptical Disk

Noise and coupling in magnetic super-resolution media for magneto-optical readout

Magnetic expansion read-out of MSR disk with double in-plane magnetic layers

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