Magnetic field resilient superconducting fractal resonators for coupling to free spins

de Graaf, Sebastian Erik,1986Chalmers tekniska högskola,Chalmers University of Technology (author)

We demonstrate a planar superconducting microwave resonator intended for use in applications requiring strong magnetic fields and high quality factors. In perpendicular magnetic fields of 20 mT, the niobium resonators maintain a quality factor above 25 000 over a wide range of applied powers, down to single photon population. In parallel field, the same quality factor is observed above 160 mT, the field required for coupling to free spins at a typical operating frequency of 5 GHz. We attribute the increased performance to the current branching in the fractal design. We demonstrate that our device can be used for spectroscopy by measuring the dissipation from a pico-mole of molecular spins.

Danilov, Andrey,1961Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)danilov (author)
Adamyan, Astghik,1984Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)astghik (author)
Bauch, Thilo,1972Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)bauch (author)
Kubatkin, Sergey,1959Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kubatkin (author)
Chalmers tekniska högskola (creator_code:org_t)

In:Journal of Applied Physics: AIP Publishing112:12, s. 123905-0021-89791089-7550

By the author/editor: de Graaf, Sebast ...; Danilov, Andrey, ...; Adamyan, Astghik ...; Bauch, Thilo, 19 ...; Kubatkin, Sergey ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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