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

The invention discloses a magnetic detection device and method based on a four-quadrant detector, belongs to the technical field of magnetic detection, and is used for solving the problems that existing magneto-optical Kerr detection equipment cannot simultaneously detect a polar magneto-optical Kerr effect and a longitudinal magneto-optical Kerr effect through a set of optical paths, the same position of a detected object is difficult to align by using two sets of optical paths, and the detection precision is low. And the detection result is influenced. The device comprises a light source, a polarizer, a spectroscope, a lens assembly, an analyzer and a four-quadrant detector. A light beam with a preset width emitted from the light source is irradiated to a measured object through the spectroscope and the lens assembly; the polarizer is arranged in a light path between the light source and the spectroscope; the measured surface of the measured object is positioned on the focal plane of the lens assembly; light reflected by a detected object at least passes through the lens assembly, the spectroscope and the analyzer and then enters the four-quadrant detector.

The present invention discloses a nanoparticle composite magneto-optical film, its preparation method, and its application, belonging to the technical field of magneto-optical film preparation and sensing applications. A CoFeB / W film is prepared on a silicon wafer using magnetron sputtering as a substrate. A gold-platinum nanoparticle layer, or a gold nanoparticle layer and a covering tungsten layer, is then spin-coated on the film. This method enhances the longitudinal magneto-optical Kerr effect of the CoFeB film by combining gold, which exhibits a surface plasmon effect, with platinum and tungsten, which exhibit a high spin-orbit coupling effect. This method utilizes the synergistic effect of these two effects to enhance the CoFeB film's longitudinal magneto-optical Kerr effect. As a sensitive element, the film has broad application potential in biomolecular sensors, as well as in the detection of viruses, bacteria, biofunctional molecules, and biological weapons.

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 utility model discloses a magneto-optical Kerr effect measurement sample testboard in the technical field of sample testboards, which comprises a testboard main body and laser main bodies, two laser main bodies are arranged on the top surface of the testboard main body, and two cylinders are symmetrically fixed at the bottom end in the testboard main body. The irradiation table is fixed to the output end of the first servo motor, then the first servo motor drives the irradiation table to rotate, so that samples on different side faces of the irradiation table sequentially move to the front of the irradiation table, meanwhile, the air cylinder drives the lifting frame to move, and the height of the irradiation table is convenient to adjust; the problems that in the prior art, existing magneto-optical Kerr effect measurement samples often need to be independently placed in front of a laser device, different samples often need to be frequently arranged in front of the laser device when multiple samples are tested in the testing mode, the sample replacement process is tedious and complex, and the testing efficiency is high are solved. Therefore, the test efficiency of a plurality of samples is influenced.

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 present invention discloses a magnetic detection device, which belongs to the technical field of magneto-optical Kerr effect detection and is used to solve the technical problem that the polar and longitudinal detection results of existing magneto-optical Kerr effect detection devices are difficult to match with the detection position. The device includes a first polarized light source, a first beam splitter, a lens assembly, a first analyzer, and a first photoelectric sensor; a second polarized light source, a second analyzer, and a second photoelectric sensor; first polarized light emitted from the first polarized light source passes through the first beam splitter and vertically enters the measured position of the measured object through a first optical path channel, and the first polarized light reflected by the measured object passes through the first optical path channel and the first analyzer to irradiate the first photoelectric sensor; second polarized light emitted from the second polarized light source passes through the second optical path channel and the second analyzer to irradiate the second photoelectric sensor.

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.

An apparatus for measuring the magneto-optical Kerr effect (MOKE) of a specimen requiring analysis of magnetic properties, such as a magnetic random access memory (MRAM) or electrical steel sheet, is disclosed. The disclosed MOKE measuring device includes a rotational chuck on which a MOKE measurement target is disposed and which rotates the MOKE measurement target, a first magnetic field generator including a first coil spaced apart from the rotational chuck and tilted at a predetermined angle with respect to the rotational chuck, and configured to generate a magnetic field, a second magnetic field generator including a second coil spaced apart from the rotational chuck and tilted at a predetermined angle with respect to the rotational chuck, and configured to generate a magnetic field, and a frame to which the first and second magnetic field generators are fixed.

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.