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We describe a fully broadband approach for electron spin resonance (ESR)experiments where it is possible to not only tune the magnetic field but alsothe frequency continuously over wide ranges. Here a metallic coplanartransmission line acts as compact and versatile microwave probe that can easilybe implemented in different cryogenic setups. We perform ESR measurements atfrequencies between 0.1 and 67 GHz and at temperatures between 50 mK and roomtemperature. Three different types of samples (Cr3+ ions in ruby, organicradicals of the nitronyl-nitroxide family, and the doped semiconductor Si:P)represent different possible fields of application for the technique. Wedemonstrate that an extremely large phase space in temperature, magnetic field,and frequency for ESR measurements, substantially exceeding the range ofconventional ESR setups, is accessible with metallic coplanar lines.

Observing electron spin resonance between 0.1 and 67 GHz at temperatures between 50 mK and 300 K using broadband metallic coplanar waveguides