Magnetic domain measurement device for magnetic wires

Abstract

The invention relates to the field of material magnetic domain measurement and especially relates to a magnetic domain measurement device for magnetic wires. The magnetic domain measurement device comprises a laser, an optical filter I, a prism polarizer, a white light source, a beam splitter I, a beam splitter II, a 1 / 2 wave plate, a 1 / 4 wave plate, a beam splitter III, a camera, an aspherical mirror I, an optical filter II, a Wollaston prism, a photoelectric detector I, a photoelectric detector II, a displacement bench, an objective lens, an aspherical mirror II, a sample, a sample tube, a pick-up coil set, a magnet, a pre-amplifier, an oscilloscope and a computer. A polarizing angle of laser emitted by the laser is set as 45 degrees; when a polarizing angle of the prism polarizer is setas 0 degree, a beam is S polarization; when a polarizing angle of the prism polarizer is set as 90 degrees, the beam is P polarization; a rotating angle setting condition of the 1 / 2 wave plate is that a proportion of the S polarization to the P polarization after reflection light on the surface of a nonmagnetic sample passes through the 1 / 2 wave plate is 1 to 2; the 1 / 4 wave plate can be used formeasuring kerr ellipticity to obtain magnetized three-dimensional vector diagrams and research spread magnetic domain wall shapes.

Description

technical field [0001] The invention relates to the field of material magnetic domain measurement, in particular to a magnetic domain measurement device for a magnetic wire that can study the magnetization characteristics of magnetic domains in different regions of the magnetic wire and the shape of the magnetic domain wall propagation. Background technique [0002] The magneto-optical Kerr effect measurement device is an important means in the study of material surface magnetism. Its working principle is based on the magneto-optic Kerr effect caused by the interaction between light and magnetized media. Magnetic detection, and non-contact measurement can be realized, and it has important applications in the research of magnetic order, magnetic anisotropy, interlayer coupling and phase transition behavior of magnetic ultrathin films. Kerr microscope is a commonly used device. Its working principle is: after plane polarized light interacts with the surface of a non-transparen...

AI Technical Summary

Problems solved by technology

The defect of the existing technology is: in order to obtain all three components of the magnetization vector, it is necessary to change the relative positions of the sample, the detector, and the light source and perform four independent measurements. The process is extremely complicated. In addition, the existing technology cannot obtain The shape of the magnetic domain wall, the magnetic domain measuring device of the magnetic wire can solve the problem

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