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Estimation of Kerr angle based on weak measurement with two pointers.

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    We developed a robust weak measurement technique using two light beam pointers to accurately determine the magneto-optical Kerr angle, even with amplitude noise. This method enhances phase information extraction for magnetic film analysis.

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    Area of Science:

    • Optics and Magnetism
    • Quantum Measurement

    Background:

    • Magneto-optical Kerr effect (MOKE) is crucial for characterizing magnetic materials.
    • Conventional MOKE measurements can be sensitive to amplitude variations and ellipticity.
    • Accurate phase information is key to understanding magnetic properties.

    Purpose of the Study:

    • To propose a novel weak measurement method for estimating the magneto-optical Kerr angle.
    • To develop a technique robust against ellipticity and amplitude noise.
    • To enhance the accuracy and dynamic range of Kerr angle measurements.

    Main Methods:

    • Utilizing a weak measurement approach with two specific pointers: amplified displacement shift and light intensity.
    • Analyzing the product of these pointers to extract phase variation information.
    • Demonstrating the method's independence from amplitude errors and noise.

    Main Results:

    • The product of the two pointers directly relates to phase variation, effectively shielding amplitude noise.
    • A good linear relationship was observed between the product of pointers and phase variation.
    • The method demonstrated a larger dynamic measurement range.
    • Successfully applied to measure the magneto-optical Kerr angle of NiFe film.

    Conclusions:

    • The proposed two-pointer weak measurement method offers a robust and accurate way to determine the magneto-optical Kerr angle.
    • This technique is significant for the precise characterization of magnetic films.
    • It provides a valuable tool for overcoming limitations in conventional MOKE measurements.