Domain Expansion Readout For Magnetic Amplifying Magneto-Optical System
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概要
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Zero Field Magnetic Amplifying Magneto-optical System (ZF-MAMMOS) is realized by using an exchange-coupled tri-layer. The recorded mark with any length appears as the expanded domain with the size of collapse diameter in the readout layer without external magnetic field. As the ZF-MAMMOS has a resolution of 1/10 of a laser beam spot, this corresponds to 40 nm using a 405 nm laser diode and an objective lens of NA, 0.9. An AlSiN enhance/cooling layer was arranged for overwriting, and a GdFeCo recording assist layer was developed for high recording field sensitivity. As a result, the durability of overwriting is improved and the recording with ±140 Oe is achieved. This result also indicates that it is possible to realize a heat assisted magnetic recording with a very small recording field.
- 2008-03-01
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