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We present preliminary results on the development of a 4.2 K scanning SQUID microscope with a bandwidth in the GHz range. We have overcome the bandwidth limitations of traditional scanning SQUID microscopes, which use a flux-locked loop, by using a hysteretic SQUID and a pulsed sampling technique. We describe the overall design and operation of our measurement system, and present high-speed measurement results.
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Matthews et al. (2005) studied this question.
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