Progress in Magnetooptical Data Storage

Magnetic recording is widely used in many present applications, for instance, in tapes for audio and video recording or in floppy and hard disks for data storage [1–5]. Optical recording, on the other hand, is still an emerging technique [5,6]. In a consumer product it has started with the Compact audio disk and is now developing in many varieties, for instance, Compact Disk-Read Only Memories (CD-ROMs), Write-Once-Read-Many media (WORMs) or magnetooptical minidisks. For comparison of magnetic and optical recording the basic principles and the physical limitations of both techniques will be discussed in the following.

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