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Study of locally frozen magnetic field in a high- superconducting ceramic
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View: Figures


Image of FIG. 1.
FIG. 1.

Diagram of the measurements, using a magnetic detector (3), of the frozen magnetic field produced by a system of microsolenoids (2, 4) carrying a current , in a ceramic HTSC sample (1).

Image of FIG. 2.
FIG. 2.

Magnetic field distribution above a ceramic slab upon imposition of an external uniform field of (solid curve 1) and a field of (dashed line 2), at which the field begins to penetrate through the slab.

Image of FIG. 3.
FIG. 3.

Plot of the value of the magnetic field above the center of a frozen vortex formed in the FC regime versus the excitation field produced by the microsolenoid.

Image of FIG. 4.
FIG. 4.

Magnetic field distribution above a vortex formed in the FC regime, before (∎) and after passage of a transport current through the samples for different values of : (▴) and (×). The inset shows a diagram of the displacement of the vortex by a distance under the influence of the current.

Image of FIG. 5.
FIG. 5.

Diagrams (in two projections) of the currents and fringing fields of macroscopic vortex structures: a—the structure formed in the ZFC regime (cooling in the ambient magnetic field of the Earth) and containing current subvortices of small size (only three of these are shown); b—the structure formed in the FC regime (cooling in the excitation field) and containing two coaxial current vortices (a double vortex) with diameters comparable to the diameter of the microsolenoid producing the excitation field: 1—sample, 2—winding of the ferroprobe detector, 3—field lines of the fringing field of the structure, 4—core of the detector, 5—contours of the vortex currents, 6—circumference of the microsolenoid, coinciding in Fig. 5b with the outer contour of the vortex current, 7—contour of the detector, 8—region of frozen flux.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Study of locally frozen magnetic field in a high-Tc superconducting ceramic