TWO-COIL APPARATUS FOR THE MEASUREMENT OF MAGNETIC PENETRATION DEPTH OF LARGE-AREA HIGH TC SUPERCONDUCTOR

摘要

A twin coil device for measuring the absolute value of magnetic field penetration distance of a large-area high temperature superconductor thin film according to the present invention, the drive coil; A detection coil disposed at a point spaced apart from the drive coil by a predetermined distance so as to face the drive coil; A specimen holder disposed at the upper left / right side with the detection coil therebetween; A large area low temperature superconductor thin film attached to the specimen holder between the drive coil and the detection coil; It consists of a large-area high temperature superconductor thin film attached to the large-area low temperature superconductor thin film between the drive coil and the detection coil, 1) zero point adjustment of the pair coil device and magnetic field penetration distance of the large area high temperature superconductor thin film Penetration depth) The absolute size of λ can be achieved in a single measurement, which solves the mechanical problems caused by zeroing, and 2) the drive coil is wound around the bottom section adjacent to the large-area high temperature superconductor film. By making the number of rotations in the reverse direction more than the number of turns of the coil wound around the top section, it is possible to remove the Js at the edge of the membrane.