Force detection of high-frequency electron spin resonance near room temperature using high-power millimeter-wave source gyrotron

摘要

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.