Title :
MO readout using defocused beam
Author :
Nigashi, K. ; Numata, Takuhisa ; Inokuchi, Seiji
Author_Institution :
Fac. of Eng. Sci., Osaka Univ., Japan
fDate :
11/1/1993 12:00:00 AM
Abstract :
A readout method using a defocused circular polarized beam is discussed. When a reversed domain is much smaller than the focused beam waist, the deterioration of the readout signal was reduced by the domain being placed away from the waist. Magnetooptic (MO) signal was obtained by detecting the difference of intensity profiles of diffraction patterns on reversal of magnetization distribution in MO medium within the illuminated region. The figure of merit of this readout method was estimated to be larger than that of the conventional system for a reversed domain which is less than 0.56 times the beam waist
Keywords :
magnetic domains; magnetisation; magneto-optical recording; MO readout; defocused circular polarized beam; diffraction patterns; figure of merit; magnetisation distribution reversal; magnetooptic signal; readout signal; reversed domain; Fourier transforms; Lenses; Magnetic domains; Magnetic materials; Magnetization; Optical diffraction; Optical polarization; Optical recording; Optical sensors; Probes;
Journal_Title :
Magnetics, IEEE Transactions on
