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A Magneto-Optical recording technology is described for storage densities of 50-100 Gb/in2 and data rates of 100-200 Mb/s. A sliding optical head which forms a key component for this recording technology has been developed. The head incorporates a thin-film coil for high data rate Magnetic Field Modulation recording and a dual lens objective with a Numerical Aperture of 0.85. To limit head-disc interface problems due to heating by the laser a cover layer of a few tens of μm is applied to the disc. Cover layer requirements are discussed and MFM recording results obtained with a NA=0.6 version of the sliding head and TbFeCo media with a thin cover layer are presented.

The realisation of a prototype miniaturised 5 mm height optical drive and 28 mm media is reported here. Using the optical light path as a starting point, this presentation will highlight the high degree of miniaturisation that is achieved in the field of the optical pickup, optical components and mechanics. Additionally we will discuss the use of newly developed disc media.

We present a magneto-optical recording head designed for a 400 nm laser with a 0.85 numerical aperture doublet objective lens and a thin film Magnetic Field Modulation coil integrated in a flying slider.© (2002) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

A sliding head with integrated focusing lens and magnetic field modulation coil has been designed and manufactured. The component can be used for high data rate, first surface magneto optical recording with a NA=0.85 and λ=400 nm. A coil is integrated into the air bearing surface of a slider to maintain a head-disk distance of around 1 µm. It can generate at least a 200 MHz modulated magnetic field of 15 kA/m fieldstrength. We have tested the coil, slider performance and two stage tracking by using a flat 0.6 mm thick slider.