期刊
APPLIED PHYSICS LETTERS
卷 78, 期 23, 页码 3645-3647出版社
AMER INST PHYSICS
DOI: 10.1063/1.1378048
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We used low-temperature scanning electron microscopy (LTSEM) for imaging quantized magnetic flux (vortices) in dc superconducting quantum interference devices (SQUIDs) with approximately 1 mum spatial resolution at temperature T=77 K in a controllable magnetic field up to 20 muT. We demonstrate that LTSEM allows to image the spatial distribution of vortices in a YBa2Cu3O7/SrTiO3/YBa2Cu3O7 multilayer thin-film structure consisting of a dc SQUID washer with an integrated input coil on top. Simultaneously, we are able to measure the low-frequency noise of the sample under test, which allows to correlate the spatial distribution of vortices with low-frequency noise in the SQUID. (C) 2001 American Institute of Physics.
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