A microwave interferometer of the Michelson-type to improve the dynamic   range of broadband ferromagnetic resonance measurements
  We present a Michelson-type microwave interferometer for use in ferromagnetic resonance experiments. The interferometer is capable of broadband operation without manual adjustment of phase delay or amplitude attenuation. A prototype of the design shows significant improvement of the signal-to-noise ratio when compared to non-interferometric ferromagnetic resonance experiments. We demonstrate that this increase in sensitivity can lead to a drastic increase in the data acquisition rate for hard-to-measure thin films that otherwise would require long integration times. 
Eric R. J. Edwards, Anthony B. Kos, Mathias Weiler, Thomas J. Silva
cond-mat.mes-hall