Dynamic Readout Characteristics Of Ungrooved Magneto-Optical Storage Media

Michael Vieth; Volker Weissenberger; Wolfgang Reim; Stefan Winkler

doi:10.1117/12.961785

28 September 1989 Dynamic Readout Characteristics Of Ungrooved Magneto-Optical Storage Media

Michael Vieth, Volker Weissenberger, Wolfgang Reim, Stefan Winkler

Proceedings Volume 1139, Optical Storage and Scanning Technology; (1989) https://doi.org/10.1117/12.961785
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France

Abstract

The evaluation of magneto-optical thin films in dynamic write-read tests requires an exact knowledge of the noise sources of the system. For common grooved plastic disks there is a superposition of two dominant noise contributions - disk noise and writing noise -which can not simply be distinguished in the signal spectra. A particular measuring method is described which allows the analysis of noise spectra of power and magnetic field scans on unstructured disk regions where the phenomenon of writing noise can easily be studied. A number of noise measurements comparing ungrooved with grooved parts on the same disk are discussed. The effect of writing noise is shown to result from unsmooth boundaries and length variations of thermomagnetically written domains. This effect is most drastically seen near the writing threshold in the bias field scans.

Citation Download Citation

Michael Vieth, Volker Weissenberger, Wolfgang Reim, and Stefan Winkler "Dynamic Readout Characteristics Of Ungrooved Magneto-Optical Storage Media", Proc. SPIE 1139, Optical Storage and Scanning Technology, (28 September 1989); https://doi.org/10.1117/12.961785

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