Physics – Condensed Matter – Superconductivity
Scientific paper
2001-04-20
Physics
Condensed Matter
Superconductivity
3 pages, 3 figures, to be published in Appl. Phys. Lett. 06/04/2001; a pdf-file is also available at http://www.pit.physik.u
Scientific paper
10.1063/1.1378048
We used low-temperature scanning electron microscopy (LTSEM) for imaging quantized magnetic flux (vortices) in direct current (dc) superconducting quantum interference devices (SQUIDs) with approximately 1 micron spatial resolution at temperature T=77 K in a controllable magnetic field up to 20 microTesla. 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.
Keil Stephen
Kleiner Reinhold
Koelle Dieter
Straub Rainer
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