Schematic illustration of principle of MO Faraday effects.
(a) Optical diagram and (b) photograph of a developed scanning laser MO imaging system with a high-sensitive differential photodetector.
(a) A laser reflection image of JVFT of YBCO. (b) The line scan profile along the inserted white line of (a).
MO signal of the MOD garnet film in a perpendicular magnetic field with the amplitude of at 100 Hz. Here, the MO signal is reduced into the magnetic field strength.
[(a) and (b)] show the three- and two-dimensional magnetic field distribution around the YBCO strip line with the applied dc-current of 1 and 3 A, respectively. These images were composed of data and observed in at a data acquisition time of without any accumulation or averaging processing. (c) The cross sectional line profiles along the inserted lines of [(a) and (b)].
MO images of magnetic stripe structures in a magnetic card and line profiles along the inserted lines which were observed by using different Faraday indicators: (a) a MOD garnet film and (b) a single crystalline LPE garnet film. These MO images were observed by using a conventional MO microscope with a crossed Nicols polarizer and a CCD camera.
(a) An optical microscope image of an YBCO JVFT device fabricated on an MgO bicrystal substrate, which is composed of bias current lines with four superconducting loops of and control current line. The dotted line shows the position of the grain boundary in the MgO bicrystal substrate. (b) MO signal from one of the superconducting loops of bias current lines, which was observed by applying a control current of square waveforms with an amplitude of 2.0 mA at a frequency of 100 Hz under the bias current condition of 1.25 mA. The measurement was carried out by illuminating the laser beam inside the loop region.
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