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Detection of electron paramagnetic resonance (EPR) using a microwave cavityresonating at a fixed frequency (between 9 and 10 GHz) remains the most popularmethod until now. Here, we report a cavity-less technique which makes use ofonly an impedance analyzer and a copper strip coil to detect L-band EPR (f =1-3 GHz) in the standard EPR marker 2,2-diphenyl-1-picrylhydrazyl (DPPH). Ourmethod relies on measuring the magnetoimpedance (MI) response of DPPH through acopper strip coil that encloses DPPH. In contrast to commercial EPR whichmeasures only the field derivative of power absorption, our method enables usto deduce both absorption and dispersion. Changes in resistance (R) andreactance (X) of the copper strip while sweeping an external dc magnetic field,were measured for different frequencies (f = 0.9 to 2.5 GHz) of radio-frequencycurrent in the coil. R exhibits a sharp peak at a critical value of the dcmagnetic field, which is identified as the resonance field and X shows adispersion at the same frequency. The data were analyzed to obtain line widthand resonance field parameters. The resonance field increased linearly withfrequency and the obtained Land\'e g factor of 1.999 is close to the acceptedvalue of 2.0036, measured in X-band. The simplicity of this technique can beexploited to study paramagnetic centers in catalysis and other materials.

Magnetoimpedance based detection of L-band electron paramagnetic resonance in 2,2-diphenyl-1-picrylhydrazyl (DPPH) molecule