Development of High-Field ESR System Using SQUID Magnetometer and its Application to Measurement under High Pressure

  • Sakurai, T. (Center for Supports to Research and Education Activities, Kobe University) ;
  • Fujimoto, K. (Graduate School of Science, Kobe University) ;
  • Okubo, S. (Molecular Photoscience Research Center, Kobe University) ;
  • Ohta, H. (Molecular Photoscience Research Center, Kobe University) ;
  • Uwatoko, Y. (Institute for Solid State Physics, University of Tokyo)
  • Received : 2012.05.31
  • Accepted : 2012.07.24
  • Published : 2013.06.30


We have developed a high-field and high-frequency ESR system using a commercially available magnetometer equipped with the superconducting quantum interference device (SQUID). This is magnetization detection type ESR and ESR is observed as a change of the magnetization at the resonance condition under irradiation of the electromagnetic wave. The frequency range is from 70 to 315 GHz and the maximum magnetic field is 5 T. The sensitivity is estimated to be $10^{13}$ spins/G. The advantage of this system is that the high-field ESR measurements can be made very easily and quantitatively. Moreover, this high-field ESR can be applied to the measurements under pressure by using a widely used piston-cylinder pressure cell.


ESR;high field;magnetization detection;SQUID;pressure cell


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