Device and method for carrying out spectrum-type magneto-optical Kerr effect test by using spectrograph

Abstract

The invention provides a device and a method for carrying out a spectrum-type magneto-optical Kerr effect test by using a spectrograph. The device comprises a white-light light source, a collimating lens, a polarizer, two diaphragms, an electromagnet, a sample platform, a polarization analyzer, a collecting lens, an optical fiber coupling device, a spectrograph and a PC (Personal Computer) machine. The device is characterized in that the white-light light source is connected with the collimating lens by an optical fiber and white light is output after the white-light light source is focused by the collimating lens; the polarizer, the two diaphragms, the polarization analyzer, the collecting lens, the optical fiber coupling device and the spectrograph are arrayed behind the collimating lens along a light path sequentially; a quarter-wave plate needs to be arranged behind the polarization analyzer and in front of the collecting lens when the ellipsometry rate is measured and the quarter-wave plate does not need to be placed when a magneto-optical deflection angle is measured; the sample platform is arranged between the two diaphragms and the sample platform is located in the middle of the electromagnet; the optical fiber coupling device is connected with the spectrograph by the optical fiber; the output end of the spectrograph is connected with the PC machine; the spectrograph is controlled by the PC machine through programming and a result is output. The system has a simple light path, low in cost and high in data precision; a spectrum curve of the magneto-optical deflection angle can be formed.

Description

technical field [0001] The invention relates to a device and method for testing the spectral magneto-optical Kerr effect by using a spectrometer, and belongs to the technical field of spectral magneto-optic Kerr effect testing. Background technique [0002] With the wide application of magnetic materials in magneto-optical storage media and semiconductor devices, the research on the magneto-optical properties of magnetic materials has become extremely urgent. The magneto-optical Kerr effect test technology uses the magneto-optic Kerr effect of magnetic materials to measure the magneto-optical deflection angle and ellipticity of magnetic materials. Therefore, the magneto-optical Kerr effect is widely used in the research of magnetic ordering, magnetic anisotropy, and interlayer coupling. However, the receiving ends of the existing spectral magneto-optic Kerr effect devices are mostly photodetectors and have complex structures, such as the article "Fe 3 o 4 and Mg 2+ or Al...

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Problems solved by technology

However, the receiving ends of the existing spectral magneto-optic Kerr effect devices are mostly photodetectors and have complex structures, such as the article "Fe 3 o 4 and Mg 2+ or Al 3+ replace Fe 3 o 4 Optical and Polar Magneto-Optic Kerr Spectroscopy Research" (by W.F.J.Fontijn and P.J.van der Zaag), the author uses a Ge material photodetector to receive the signal, and uses a xenon lamp and a monochromator to test the magneto-optical Kerr deflection angle of the material spectral curve

This system needs to adjust the monochromator successively to change the output wavelength and calculate the magneto-optical deflection angle at each wavelength successively. The design is more complicated and the operation is time-consuming.

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