FORCE-DETECTED ELECTRON-SPIN-RESONANCE - ADIABATIC INVERSION, NUTATION, AND SPIN-ECHO

Electron-spin resonance of E' centers in vitreous silica was studied u sing force-detection techniques at temperatures down to 5 K. Cyclic ad iabatic inversion of electron spins was pet-formed by frequency modula tion of the applied microwave magnetic field, This produced an oscilla tory magnetic force between the electron spins and a nearby permanent magnet, resulting in the vibration of a cantilever on which the sample was mounted. By pulsing the microwave field prior to the force-detect ion sequence, nutation of the spins could be observed. Spin echoes wer e observed mechanically using a modified echo-pulse sequence. The deca y of magnetization during cyclic adiabatic inversion was also studied and is discussed in terms of utility for future single-spin detection experiments.