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arxiv: cond-mat/0104386 · v1 · submitted 2001-04-20 · ❄️ cond-mat.supr-con

Low-frequency flux noise and visualization of vortices in a YBa2Cu3O7 dc SQUID washer with an integrated input coil

R. Straub (1) , S. Keil (1) , R. Kleiner (1) , D. Koelle (2) ((1) Universitaet Tuebingen , Experimentalphysik II , Germany (2) Universitaet zu Koeln , II. Physikalisches Institut , Germany) This is my paper
classification ❄️ cond-mat.supr-con
keywords vorticeslow-frequencynoisespatialsquidyba2cu3o7allowscoil
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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.

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