Test system and method for high-order magneto-optical Kerr effect in ferromagnetic film and magneto-optical Kerr effect criterion method

By using a simplified vertical incident optical path system and a quadrupole magnet to control the direction of the magnetic field, the QMOKE signal can be directly observed, solving the complex problem of detecting high-order magneto-optical Kerr effect in existing technologies and enabling more intuitive signal measurement and quantitative analysis.

CN122109939APending Publication Date: 2026-05-29UNIV OF SCI & TECH OF CHINA
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Patent Information

Application Number
CN202610276261.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-09
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing methods for detecting high-order magneto-optical Kerr effects are complex and difficult to describe signal changes in a direct and detailed manner. The 8-field method is also difficult to describe in detail the changes in the second-order magneto-optical Kerr effect (QMOKE) signal as the magnetic moment inside the sample changes.

Method used

A simplified measurement system with a vertically incident optical path is used. The direction of the applied magnetic field is controlled by a quadrupole magnet. Combined with linear polarization and polarization detectors, a photodetector is used to record the changes in light intensity, simplifying the optical path structure and allowing direct observation of the QMOKE signal.

Benefits of technology

It simplifies the measurement process of QMOKE signals, provides a more intuitive measurement method and result curves, is suitable for independent experiments, can directly determine the existence of QMOKE effect and perform quantitative analysis, and assists in the study of magnetic domains and internal electronic structure of ferromagnetic thin films.

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Abstract

The invention discloses a test system and method for a high-order magneto-optical Kerr effect in a ferromagnetic film and a magneto-optical Kerr effect criterion method, and belongs to the field of spintronics and magneto-optics. A magneto-optical Kerr detection light path is established, the direction of an applied magnetic field is regulated and controlled through a quadrupole magnet so as to regulate and control the magnetic moment direction of a sample, a light intensity change curve under a rotating magnetic field is detected through a photoelectric detector, whether the sample has a second-order magneto-optical Kerr effect (QMOKE) or not is represented according to the light intensity change curve, and the intensity is quantitatively observed. According to the method, only a single light intensity change curve obtained by vertical incidence is used as a characterization basis of the QMOKE, the influence of the magnetic field direction on a QMOKE signal is comprehensively characterized by a small-stride (5-degree) rotation applied magnetic field measurement method, the QMOKE intensity can be calculated according to the amplitude, the step of separating the first-order magneto-optical Kerr effect (LMOKE) from the QMOKE is simplified, and the accuracy of the QMOKE signal is improved. And the characterization criterion of the ferromagnetic film system, especially the QMOKE effect of the Fe structure film, is simplified.
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