|(hardware, storage)||magneto-optical disk - Plastic or glass disks coated with a
compound (often TbFeCo) with special properties. The disk is
read by bouncing a low-intensity laser off the disk.
Originally the laser was infrared, but frequencies up to blue
may be possible; the shorter the wavelength the higher the
possible density. The polarisation of the reflected light
depends on the polarity of the stored magnetic field.|
To write, a higher-intensity laser is used to heat the material up to its Curie point, allowing its magnetisation to be altered and "frozen" as it cools.