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A magnetic shield around the flux guide in a SQUID probe microscope with finite element simulation

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In a superconducting quantum interference device (SQUID) probe microscope, the existence of a needle with high permeability as a flux guide can increase the spatial resolution. Also, the flux guide makes it possible to measure the samples in air at room temperature. Using a finite element method (FEM), we analyzed the property of a magnetic shielding cylinder with high permeability Permalloy around the needle. Simulation results show that a cylindrical shield around the flux guide can increase the spatial resolution of the SQUID probe microscope. Also, a model of a small SQUID has been designed and the calculated result shows that the spatial resolution is higher than a SQUID with the flux guide and the shield around it.

Document Type: Research Article


Publication date: December 1, 2007

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