B Baek et al 2004 Supercond. Sci. Technol. 17 1022 doi:10.1088/0953-2048/17/8/013
B Baek1, S H Moon2, Su-Young Lee3, S M Lee4, J I Kye4, H J Lee4 and Z G Khim1
Show affiliationsA 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.
85.25.Dq Superconducting quantum interference devices (SQUIDs)
07.55.Ge Magnetometers for magnetic field measurements
07.55.Jg Magnetometers for susceptibility, magnetic moment, and magnetization measurements
Issue 8 (August 2004)
Received 23 February 2004
Published 15 June 2004
B Baek et al 2004 Supercond. Sci. Technol. 17 1022
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