Resonance THz spectroscopy in high magnetic fields

The employment of the high-magnetic-field resonance spectroscopy to probe magnetic excitations in the THz frequency range is reported. To illustrate the great potential of this technique in solid state physics, we present results of recent electron spin resonance studies of the quantum-tunneling effect in the single-molecule magnet Mn12tba and of the soliton-magnon crossover in Cu-PM, a spin-1/2 Heisenberg chain system with a staggered transverse field. Among others, we report on the successful use of the THz-range time-domain and free electron laser spectroscopy to study magnetic excitation spectra in pulsed magnetic fields. (C) 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.