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We describe a simple experimental method to detect electron paramagneticresonance (EPR) in polycrystalline 2,2-diphenyl-1-picrylhydrazyl (DPPH) sample,the standard g-marker for EPR spectroscopy, without using a cavity resonator ora prefabricated waveguide. It is shown that microwave(MW) current injected intoa layer of silver paint coated on an insulating DPPH sample is able to excitethe paramagnetic resonance in DPPH. As the applied dc magnetic field H isswept, the high-frequency resistance of the Ag-paint layer, measured at roomtemperature with a single port impedance analyzer in the MW frequency range 1to 2.5 GHz, exhibits a sharp peak at a critical value of the dc field (H =Hres) while the reactance exhibits a dispersion-like behavior around the samefield value for a given frequency. Hres increases linearly with the frequencyof MW current. We interpret the observed features in the impedance to EPR inDPPH driven by the Oersted magnetic field arising from the MW current in theAg-paint layer. We also confirm the occurrence of EPR in DPPH independentlyusing a coplanar waveguide-based broadband technique. This technique has thepotential to investigate other EPR active inorganic and organic compounds.

Electrically detected paramagnetic resonance in Ag-paint coated DPPH