Super Resolution Readout of a Magneto-Optical Disk With an in-Plane Magnetization Layer

Murakami, Y.; Iketani, N.; Nakajima, J.; Takahashi, Akira; Ohta, Kenji; Ishikawa, Toshio

doi:10.3379/jmsjmag.17.s1_201

Cited by 22 publications

(13 citation statements)

References 1 publication

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“…In the three-layer structure, an intermediate layer is used to mediate the coupling between the RL and the storage layer ͑SL͒, tailoring the magnetic coupling between RL and SL and causing an abrupt transition of the RL polar Kerr signal with the rise in temperature. The intermediate layer between RL and SL can be a dielectric layer 3,9 or a magnetic layer. 6 In CAD-MSR disks, the RL is usually an amorphous film of GdFeCo alloy.…”

Section: Introductionmentioning

confidence: 99%

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

Peng

Mansuripur

1999

Journal of Applied Physics

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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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Section: Introductionmentioning

confidence: 99%

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

Peng

Mansuripur

1999

Journal of Applied Physics

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“…An elegant example of such effects has been demonstrated in recent years through the concept of magnetic superresolution ͑MSR͒. [1][2][3][4][5] In one MSR scheme, Murakami et al 4 used two layers, one ͑the storage layer, SL͒ having perpendicular magnetization and the other ͑the readout layer, RL͒ having in-plane magnetization at room temperature. The temperature response of this system depends strongly on the exchange interactions between the RL and the SL.…”

Section: Introductionmentioning

confidence: 99%

Exchange coupling in rare-earth/transition-metal multilayers for magnetic super-resolution

Ayres¹,

Marinero²

1996

Journal of Applied Physics

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Articles you may be interested inStructure and magnetism of epitaxial rare-earth-transition-metal films J. Appl. Phys. 81, 5637 (1997); 10.1063/1.364845 Disclinations and magnetism in rareearth-transitionmetal hard magnets J. Appl. Phys. 61, 3580 (1987); 10.1063/1.338707 Microstructure and magnetism in amorphous rareearth-transitionmetal thin films. II. Magnetic anisotropy Microstructure and magnetism in amorphous rareearth-transitionmetal thin films. I. MicrostructureWe study exchange coupling in rare-earth/transition-metal multilayers in which one layer has perpendicular magnetization and a second layer has in-plane magnetization at room temperature. The exchange coupling between these layers is mediated by a thinner intermediate layer, and we investigate the dependence of the exchange on the magnetic properties of this intermediate layer from room temperature through the compensation and Curie temperatures of the layers. The structures of interest consist of a 400 Å TbFeCo layer with perpendicular magnetization, a 400 Å GdFeCo layer with in-plane magnetization, and a GdFe intermediate layer of variable composition and thickness. The results indicate that the structures are well-described by either a two-layer or a three-layer coherent rotation model ͑depending on intermediate-layer thickness͒ and that the influence of the intermediate layer is a function of its anisotropy energy, its thickness, and the identity of its dominant atomic moment.

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“…In this paper, we will report the results of read-out characteristics and a magnetic expansion mechanism of a domain expansion disk with double in-plane magnetic layers, and we confiirmed that it is possible to improve the signal level without an external magnetic field. Manuscript received January 3 1,1997 Atsushi Yamaguchi, TEL: +8 1-584-64-4843 FAX: +8 1-584-64-4006…”

Section: Introductionmentioning

confidence: 99%

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

et al. 1997

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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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Super Resolution Readout of a Magneto-Optical Disk With an in-Plane Magnetization Layer

Cited by 22 publications

References 1 publication

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

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

Exchange coupling in rare-earth/transition-metal multilayers for magnetic super-resolution

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

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