7 results about "Magneto-optic Kerr effect" patented technology

The application discloses a kind of measurement system and method based on magneto-optical Kerr effect, belong to magnetic material measurement and imaging technical field, including three-dimensional displacement platform, optical path unit, electromagnetic unit and software control unit, three-dimensional displacement platform is in the magnetic field provided by electromagnetic unit;Optical path unit includes frame body and the laser generating device, focusing control device, differential signal measuring device and imaging device arranged in frame body interior;Linearly polarized light provided by laser generating device is focused to the sample surface fixed on three-dimensional displacement platform by focusing control device, sample surface reflects and returns focusing control device by reflected light, beam splitting obtains first reflected light and second reflected light, and the focusing control device can move up and down;Differential signal measuring device receives second reflected light to obtain electric signal, and transmit to software control unit;Imaging device receives first reflected light to realize the imaging of sample;Software control unit draws hysteresis loop according to the magnetic field intensity of the magnetic field and electric signal.

This invention provides a magnetic detection device based on diamond NV centers and the Kerr effect. It achieves the sharing of light sources and optical paths between magnetic detection technologies based on the magneto-optical Kerr effect and those based on NV centers, combining the two technologies and greatly simplifying the device structure. This increases the intensity of the optical signal received by the detection module, reduces noise interference in the signal, and thus improves the accuracy of magnetic detection. It can simultaneously meet the requirements of rapid and high-resolution detection, and improve the overall detection speed while ensuring detection accuracy.

The invention relates to the technical field of magnetic measuring instruments, in particular to a magneto-optical Kerr effect-based magneton space imaging scanning device and method. The device comprises a transmitting assembly which comprises a laser, a beam expander, a beam splitter, a reflector, a first half-wave plate, a polarization beam splitting cube, a calcite polarizer, a first dichroscope, an objective lens, an LED light transmitting part, a convex lens and an achromatic doublet lens so as to focus an incident beam on an object to be measured; the scanning assembly comprises a second dichroscope, a second half-wave plate, a reflecting mirror, a beam splitter prism, a right-angle reflecting prism, an achromatic doublet lens, a photoelectric balance detector, a lock-in amplifier, a magnetic field applying part and a piezoelectric displacement table and is used for scanning an object to be detected; and the imaging assembly comprises a convex lens, a CMOS camera and a data processing component to generate a morphology image and a spin wave image. According to the invention, high-spatial-resolution, high-magnetic-sensitivity and wide-band spatial imaging measurement can be carried out on the spin wave and the magneton frequency comb.

The invention discloses an anti-interference differential polarimeter, which belongs to the technical field of optical measurement instruments, organically combines magneto-optical modulation with a polarization difference method for the first time, solves the problem of weak optical rotation signal detection in an open environment, has a lower glucose solution measurement limit of 0.020 g / mL, has greatly improved anti-interference capability compared with a traditional polarimeter, and has a wide application prospect. For solutions with different concentrations, the average error is maintained at a lower level of 3.25%, not only can light source fluctuation and ambient light interference be overcome and stable measurement be realized, but also subjective judgment of human eyes can be eliminated and objective quantitative reading can be realized. According to the invention, accurate measurement of a glucose solution in a range of 0.020-0.400 g / mL can be realized, automatic data acquisition and real-time concentration display are realized, and the system integrates electromagnetism, optics and information science, can be used as an ideal platform for college physical experiment and common physical experiment teaching, and has a wide application prospect. The method can also be popularized to measurement of physical quantities such as magneto-optical Kerr effect, weak magnetic field and micro displacement, and is wide in application prospect.

The application relates to the technical field of magnetism measuring instruments, in particular to a magnetic sub-space imaging scanning device and method based on the magneto-optical Kerr effect. The device comprises a transmitting assembly, a scanning assembly and an imaging assembly. The transmitting assembly comprises a laser, a beam expander, a beam splitter, a mirror, a first half-wave plate, a polarization beam splitting cube, a calcite polarizer, a first dichroic mirror, an objective lens, an LED light emitting component, a convex lens and an achromatic doublet lens, so as to focus an incident light beam on a to-be-measured object. The scanning assembly comprises a second dichroic mirror, a second half-wave plate, a mirror, a beam splitting prism, a right-angle reflecting prism, an achromatic doublet lens, a photoelectric balance detector, a lock-in amplifier, a magnetic field applying component and a piezoelectric displacement stage, so as to scan the to-be-measured object. The imaging assembly comprises a convex lens, a CMOS camera and a data processing component, so as to generate a topographic image and a spin wave image. The application can perform high spatial resolution, high magnetic sensitivity and wide frequency band spatial imaging measurement on spin waves and magnetic sub-frequency combs.

The application discloses a method for forming a magnetic skyrmion based on femtosecond laser pulse regulation and a writing device, and the method comprises the following steps: obtaining a CoFeB nanodisk and placing the CoFeB nanodisk in a sample placement area of a magneto-optical Kerr effect microscope; performing pulse excitation on the CoFeB nanodisk by adjusting a femtosecond laser thermal pulse, controlling the generation and annihilation of skyrmions of the CoFeB nanodisk in a preset area, and obtaining the number and position of the skyrmions; and performing data writing and reading according to the generation and annihilation of the skyrmions and the number and position of the skyrmions. The device comprises a femtosecond laser pulser, a CoFeB nanodisk and a temperature sensor. The embodiment of the application can reduce energy consumption, avoid the interference of external noise, and further improve the accurate control ability of the number and position of the skyrmions. The application can be widely applied in the technical field of spin electronics.

A kind of test system, method and magneto-optical kerr effect criterion method of high-order magneto-optical kerr effect in ferromagnetic film belong to the field of spintronics and magneto-optics. By building a magneto-optical kerr detection light path, the direction of the external magnetic field is regulated by the quadrupole magnet to regulate the magnetic moment direction of the sample, and the light intensity change curve under the rotating magnetic field is detected by the photodetector. Whether the sample has second-order magneto-optical kerr effect (QMOKE) is characterized, and the intensity is quantitatively observed. The method only needs a single light intensity change curve obtained by vertical incidence as the characterization basis of QMOKE, and the measurement method of small step (5°) rotation of external magnetic field comprehensively characterizes the influence of magnetic field direction on QMOKE signal, and can calculate QMOKE intensity according to amplitude, simplifies the steps of separating first-order magneto-optical kerr effect (LMOKE) and QMOKE, and simplifies the characterization criterion of QMOKE effect of ferromagnetic film system, especially Fe structure film.