Papers by Keyword: Magneto-Optics

Abstract: A model of the rearrangement of the domain structure of the Tb_0.2Y_2.8Fe₅O₁₂ garnet ferrite in the temperature region of the spontaneous reorientation of the easy magnetization axis is proposed, which makes it possible to consistently describe (at a qualitative level) the entire set of experimental results obtained. The latter makes it possible to make a choice in favor of the fluctuation mechanism of nucleation of domains of a new magnetic phase in the process of reorientation of the direction of the easy magnetization axis.

Abstract: The influence of most physical factors on the revelation ability of magneto-optic eddy current defectoscopy of linear defects in metallic objects is investigated. Uniaxial anisotropy multi-component Bi-substituted garnet film is used as the sensor element. The efficiency of visualization depends on frequency and amplitude of the inducer’s electric current and the biasing magnetic field. Optimal values of these parameters are obtained. It is shown that the alternative magnetic field exerts the most influence on the eddy current magneto-optic image.

Abstract: The results of the effect of mechanical strain on magnetic anisotropy, the direction of magnetization vector and domain structure of ferrite-garnet film, rigidly connected with the zirconium-titanium lead (PZT) piezoceramic plate are presented. It was established, that applied mechanical strain caused a 90°-reorientation of the magnetization vector from the initial perpendicular-to-plane into in-plane state. This strain acts similarly as applied magnetic field and when it applied simultaneously with the field, the piezovoltage necessary for reorientation is inversely proportional to magnetic field intensity. Such properties makes sandwich structures promising for use in spintronics and optoelectronics as a multicontrolled modulator of light.

Abstract: The electrophoretic deposition of TiO₂ iron oxide nanocrystal monolayers from stable, mixed colloidal suspensions by electrophoretic deposition using non polar solvents is reported. The selective deposition of TiO₂ was accomplished by controlling the mobility of the nanocrystals and the voltage during electrophoretic deposition. The effect of the electrophoretic deposition processing parameters (voltage and particle mobility) on the promotion and suppression of nanocrystal deposition was investigated.