Submillimetre-wave electron spin-resonance measurements for single-crystal

Abstract

Submillimetre-wave ESR measurements for single crystal have been performed for the first time in the frequency region from 60 to 383 GHz using a pulsed magnetic field up to 16 T. AFMR modes below have been analysed by a model proposed previously, which is essentially the molecular-field theory with the assumption of an S = 1 dimer of two spins. The anisotropies of the system are determined by the analysis, and they are discussed together with the results of our magnetization measurements.