We report a combined μm-level topography and high-frequency magnetic field probe, a 6 μm loop defined on a scanning-force microscope cantilever. Since it functions as a near-zone antenna, it can be used with any suitable detector, and can probe both active and passive samples. We demonstrate its performance by scanning a coplanar waveguide sample at 10 GHz using a microwave network analyzer. With this instrument, the device noise at this frequency is ∼2μΦ0/Hz1/2 at T=300 K, comparable to that found for a superconducting quantum interference device (SQUID) at DC. Unlike the SQUID, however, the thermally limited minimum-detectable field of this system scales with frequency.
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Agrawal et al. (1997) studied this question.
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