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A Hall Microscope for Visualizing the Magnetic States of Objects

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Abstract

A three-dimensional microscope with a sensitivity of 2.5 μG/Hz1/2 has been developed on the basis of two Hall probes. The magnetic field dynamic range of the microscope at a frequency of 19 Hz is 2.5 μG–80 kG. The maximum observed area of the objects under study is 7.5 × 7.5 mm2 with a resolution of 50 × 50 μm2. The minimum scanning step along the X and Y axes is 5 μm. The maximum displacement along the Z axis is 25 mm with a minimum scanning step of 1 μm. An arbitrarily shaped instrument function can be created in the magnetic complex by combining the temperature, the stationary and alternating magnetic fields, and the transport current. The microscope was used for the spatial and temporal visualization of the structure and properties of the critical state, as well as for diagnosing superconductors at temperatures of 4.2–300 K in magnetic fields of 0–80 kG.

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  1. Institute of Radio Engineering and Electronics, Russian Academy of Sciences, pl. Vvedenskogo 1, Fryazino, Moscow oblast, 141190, Russia

    Kh. R. Rostami

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Rostami, K.R. A Hall Microscope for Visualizing the Magnetic States of Objects. Instruments and Experimental Techniques 47, 809–816 (2004). https://doi.org/10.1023/B:INET.0000049704.84122.73

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  • DOI: https://doi.org/10.1023/B:INET.0000049704.84122.73

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