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All-electrical broadband spectroscopy

Brief description of equipment

The setup is operated in the Nano-Fluxonics lab
It allows for
● combined microwave transmission and dc voltage measurements,
● vector network analyzer-based ferromagnetic resonance (VNA-FMR),
● fluctuation spectroscopy.

The setup is based on a 4He cryostat equipped with a home-made high-frequency cryogenic sample probe.

The instrumentation allows for measuring the transmitted/absorbed microwave power and the dc and ac voltages at temperatures from 2 to 300 K and magnetic fields up to 12 T.

In the frequency range 0.3 MHz – 20 GHz the ac stimuli is sourced from an Agilent E5071C vector network analyzer, while at lower frequencies a lock-in amplifier can be used.

Samples are thin films (on substrates up to 10×10 mm2) patterned in a suitable 50 Ω impedance-matched geometry, e.g. microstrips, coplanar waveguides, resonators etc. In addition, a low-frequency spectrum analyzer can be used for fluctuation (noise) spectroscopy measurements.

Contact person(s)
Oleksandr Dobrovolskiy

Physikalisches Institut
Goethe University
Frankfurt am Main

Related publications

[1] Mobile fluxons as coherent probes of periodic pinning in superconductors,
O. V. Dobrovolskiy, M. Huth, V. A. Shklovskij, and R. V. Vovk
Sci. Rep. 7, 13740 (2017)

[2] lternating current-driven microwave loss modulation in a fluxonic metamaterial
O. V. Dobrovolskiy, M. Huth, and V. A. Shklovskij
Appl. Phys. Lett. 107, 162603 (2015)

[3] Dual cut-off direct current-tunable microwave low-pass filter on superconducting Nb microstrips with asymmetric nanogrooves
O. V. Dobrovolskiy and M. Huth
Appl. Phys. Lett. 106, 142601 (2015)

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