High-resolution and dynamic domain observation in demagnetization process at elevated temperature using UV Kerr microscope

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Magnetization reversal were clearly observed with a high-resolution and dynamic domain observation system using Kerr microscope in order to analyze the mechanism of magnetization reversal in high-anisotropic magnetic materials at elevated temperatures. It was found that nanometer-sized domain patterns could be observed with the UV Kerr microscope with a wavelength of 248 nm. The coercivity of the magnetic materials depends on the volume of magnetically coupled grains that simultaneously reverse their magnetization. We found that simultaneous magnetization reversal in several grains occurred at elevated temperatures, and the extent of simultaneous magnetization reversal increases with temperature.