SQUID MICROSCOPE

Author:

YEH W. J.1,CHENG BO1

Affiliation:

1. Department of Physics, University of Idaho, Moscow, Idaho 83844, The United States of America

Abstract

We have developed and tested a new type of SQUID microscope, which can operate in magnetic field and at higher temperature. In the system, a single loop coupling transformer made from high-Tc superconducting thin film is used. At one end of the transformer, a small detecting loop about 20 μm can be placed very close to the sample under investigation. At the other end of the transformer, a large loop is tightly coupled with a NbTi coil, which in turn is connected to a low-Tc SQUID. The position of the detecting loop relative to the sample can be remotely controlled. Different sizes of transformer have been tested and calibrated. The results show that the system is capable of detecting a single flux line.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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