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Investigation of a magnetic flux-guide for a HTS scanning superconducting quantum interference device microscope

B Baek1, S H Moon2, Su-Young Lee3, S M Lee4, J I Kye4, H J Lee4 and Z G Khim1

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A magnetic flux-guide in the form of a sharp needle is known to enhance the spatial resolution of the scanning SQUID microscope. We investigated the properties of a soft ferromagnetic tip as a flux-guide by measuring the local field of the tip end. The effects of the flux-guide, such as the transmission of a magnetic signal, length dependence, and nonlinear distortion, were observed. We also present the design and construction of a HTS scanning SQUID microscope with a flux-guide and a planar gradiometer. The gradiometer with a flux-guide is an appropriate solution for improving the performance of the scanning SQUID microscope with a flux-guide as regards the prevention of external field noise without magnetic shields.


PACS

85.25.Dq Superconducting quantum interference devices (SQUIDs)

74.25.Ha Magnetic properties

07.55.Ge Magnetometers for magnetic field measurements

07.55.Jg Magnetometers for susceptibility, magnetic moment, and magnetization measurements

Subjects

Superconductivity

Instrumentation and measurement

Dates

Issue 8 (August 2004)

Received 23 February 2004

Published 15 June 2004



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