A modified Varian electron paramagnetic resonance (EPR) spectrometer is used with a klystron to do ferromagnetic resonance (FMR) spectroscopy in the X-band (9.53 GHz). The magnetic sample to be measured is placed between the pole of an electromagnet, at the end of a shorted waveguide or in a cavity. An incident microwave signal couples to the sample and is partially absorbed. The reflected microwave signal is measured by a diode detector as a function of the applied static field. This profile of the measured signal shows characteristic FMR peaks. The position and linewidth of these FMR peaks provide information on the fundamental parameters of the material.

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