Multilayered Magneto-Optical Disks for Magnetically Induced Superresolution

Kaneko, M.; Aratani, Katsuhisa; Ohta, Masumi

doi:10.1143/jjap.31.568

Cited by 79 publications

(23 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10). Then the ef- fective aperture is smaller than that given by optical theory and the information can be extracted from the intensity modulation induced by the rotating disk [15]. Masking can be obtained, in principle, by the temperature profile of the reading laser.…”

Section: Magnetically Induced Sup Erresolution (Msr)mentioning

confidence: 99%

Exchange Coupled Double Layers for Magneto-Optical Applications

et al. 1997

View full text Add to dashboard Cite

Optical data storage is a rapidly developing technique, which emerges in many varieties. Magneto-optical recording, in particular, applies amorphous rare earth/transition metal films, where a binary coded information is written thermomagnetically and is read by the magneto-optical Kerr or Faraday effect. To increase the writing speed and the recording density, techniques for direct overwrite and magnetically induced superresolution were proposed, which involve these of exchange coupled double layer systems as a storage media. In this paper, the principles and the properties of exchange coupled double layers are discussed with respect to the direct overwrite and the magnetically induced superresolution processes. A formalism based on a switching field diagram is developed yielding all information necessary to achieve reliable and practical writing procedures. As an example, the direct overwrite capability is demonstrated experimentally in antiparallel coupled layer systems.

show abstract

Section: Magnetically Induced Sup Erresolution (Msr)mentioning

confidence: 99%

Exchange Coupled Double Layers for Magneto-Optical Applications

et al. 1997

View full text Add to dashboard Cite

show abstract

“…Trilayer film with the structure of GdFeCo/GdFeCoSi/TbFeCo is presently used as the medium of super-resolution MO storage, in which GdFeCo is the readout layer, GdFeCoSi is the intermediate exchange layer, and TbFeCo is the recording layer. 4 In this article, the result of our preliminary studies on GdFeCo, GdFeCoSi, and TbFeCo single-layer films and their bilayers and trilayers by FMR are reported. It demonstrates that FMR is a very convenient tool in exploring some special properties, such as easy-cone anisotropy in films and exchange coupling in multilayered films, which will be described subsequently.…”

Section: Introductionmentioning

confidence: 98%

Ferromagnetic resonance study on single and multiple layers of rare-earth, transition-metal alloys

Wang

Zhao

Wang

et al. 2003

Journal of Applied Physics

View full text Add to dashboard Cite

Single layers of GdFeCo (40 nm), GdFeCoSi (40 nm), TbFeCo (40 nm), and their bilayers and trilayers with the compositions near those in the medium of magnetic super-resolution magneto-optical (MO) storage made by sputtering on glass substrate with buffer and capping layers of SiN (5 nm) were studied by measuring the hysteresis loop and by ferromagnetic resonance (FMR). TbFeCo layer shows strong perpendicular anisotropy. GdFeCoSi layer shows easy-plane anisotropy. However, in some films an inverted loop was observed in the direction of film normal. FMR shows the existence of two phases with, respectively, easy-plane and easy-normal anisotropy, which explains the inverted loop. FMR on a GdFeCo layer shows a cone anisotropy with easy direction at 30° with respect to film normal. TbFeCo/GdFeCoSi shows a double Hc hysteresis loop and an easy-plane anisotropy for the GdFeCoSi sublayer. In GdFeCo/GdFeCoSi bilayers, both sublayers show easy-cone anisotropy with directions at 70° and 60° from the normal. GdFeCo/GdFeCoSi/TbFeCo trilayer film shows predominantly the resonance peak of the GdFeCoSi sublayer with easy-cone anisotropy of about 60° and a unidirectional anisotropy due to the interfacial exchange effect.

show abstract

“…Nonlinear optical crystals play an important role in various advanced scientific and technical areas [1] such as resonance ionization spectroscopy [2], plasma production [3], photoacoustic spectroscopy [4], launching artificial earth satellite [5], remote sensing [6], biology [7], industries [8], high density optical disk system [9] etc., due to their higher NLO coefficient. Harmonically generated laser's characteristic properties like directionality, intensity, monochromacity and coherence are specified by the optical nature of NLO medium (crystals).…”

Section: Introductionmentioning

confidence: 99%