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We present non-conventional electron spin resonance (ESR) experiments usingmicrofabricated superconducting waveguides. We show that a very broad frequencyrange, from 0.5 to 40 GHz, becomes accessible with a high frequency accuracy ofless than 1 MHz at low temperatures down to 1.6 K and in fields up to 1.4 T.This allows an accurate inspection of the ESR absorption position in thefrequency domain, in contrast to the more common observation in the fielddomain. We demonstrate the applicability of frequency-swept ESR on Cr3+ atomsin ruby as well as on organic radicals of the Nitronyl-nitroxide family (usingthe 2-(4'-methoxyphenyl)-4,4,5,5-tetra-methylimidazoline-1-oxyl-3-oxide, a.k.a.NitPhOMe). Measurements between 1.6 and 30 K reveal a small frequency shift ofthe ESR and a resonance broadening below the critical temperature, which weboth attribute to a modification of the magnetic field configuration due to theappearance of shielding currents.

Broadband electron spin resonance from 500 MHz to 40 GHz using superconducting coplanar waveguides