| 摘要 |
PURPOSE:To make the title head expand in storage capacity, miniaturize in size and low in cost by using a synthesized magnetic field by orthogonal magnetic field application electrodes so as to apply write and reading a signal with vector composition of outputs of a couple of photodiodes detecting the light detected by polarized plane analyzers whose analyzed planes are made orthogonal. CONSTITUTION:The synthesized magnetic field of magnetic fields 305, 306 formed by the magnetic field application magnetic poles 303, 304 made nearly orthogonal at write causes magnetic polarization to a magnetic film 308 for write. In reading the recorded information next, the light generated from a laser diode 114 is subject to linear polarization by a polarizer 117, the spot is narrowered by an objective lens 107 to form a spot on a recording magnetiza tion thin film 101. When a light touches a magnetic domain 351 subject to magnetic polarization, the light interacts on the magnetization 353 to rotate the polarized plane. The returned light is divided into two by a beam splitter 110, they pass through analyzers 111a, 111b arranged to have analyzed places orthogonal to each other, they are received by photodiodes 6a, 6b, from which n-bit information is read corresponding to the received quantity thetan.
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