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Magnetic super-resolution

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3 Author(s)
Murakami, Yoshiteru ; Precision Technol. Dev. Center, Sharp Corp., Nara, Japan ; Takahashi, Akira ; Terashima, S.

Magnetically induced super-resolution (MSR) disks have been proposed to overcome the diffraction limit. This paper reports an MSR disk which has exchange-coupled magnetic double layers. An in-plane magnetization film is used as a readout layer in the magnetic double layers. The MSR disk can be overwritten by a magnetic field modulation recording method. An areal density of 2.2 Gbit/in2 was obtained with a currently available optical head having a 680 nm wavelength laser. Besides, the disk had high recorded-data-stability in continuous readout of 5×105 revolutions with a laser power of 2.5 mW, and it also kept a high signal quality after a continuous erasing test of 2×105 revolutions with a recording laser power of 6.5 mW

Published in:

Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 6 )