Abstract
On the basis of Hall transducers, a three-dimensional scanning microscope with a sensitivity of ~2.5 × 10–3 G/Hz1/2 was designed. The dynamic range of the microscope with respect to the magnetic field ranges from 10–3 to ±3 × 103 G. The stability of a given magnetic field is better than 10–5 G. The minimum value of steps when the magnetic field varies stepwise is 10–3 G. The maximum survey area of the objects under study is 5 × 5 mm2. The minimum scanning step sizes are 10 and 1 μm along the Х and Y axes, respectively, for rough and fine displacements of the tables. The maximum scanning size along the Z axis is 25 mm with minimum scanning steps of 10 and 1 μm, respectively, for rough and fine displacements. The microscope allows one to create an instrument function of an arbitrary shape due to a combination of the specified temperature, transport current, a dc magnetic field, and a time-oscillating ac magnetic field. Examples of applying the microscope to investigations of high-temperature BSCCO and YBCO superconductors are presented.
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