Abstract
We report the measurement of force-detected electron spin resonance (FDESR) at 154 GHz using a gyrotron. The high output power allows the use of a strong transverse magnetic field larger than 10−4 T, which is sufficient to cause ESR saturation. We obtained the FDESR signal with a high spin sensitivity on the order of 1012 spins/G at 280 K. Our system has promising applications in high-frequency ESR studies of low-spin concentration samples, such as metalloprotein solutions.
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