Title :
Magnetic super-resolution
Author :
Murakami, Yoshiteru ; Takahashi, Akira ; Terashima, Shigeo
Author_Institution :
Precision Technol. Dev. Center, Sharp Corp., Nara, Japan
fDate :
11/1/1995 12:00:00 AM
Abstract :
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
Keywords :
magnetic multilayers; magneto-optical recording; 2.5 to 6.5 mW; 680 nm; MSR disk; areal density; data stability; diffraction limit; exchange-coupled magnetic double layers; in-plane magnetization film; magnetic field modulation recording; magnetic super-resolution; optical head; signal quality; Diffraction; Disk recording; Magnetic fields; Magnetic films; Magnetic modulators; Magnetization; Optical films; Optical recording; Power lasers; Signal resolution;
Journal_Title :
Magnetics, IEEE Transactions on
