Fig. 3: Demonstration of the reappearance of the AFM state upon magnetization reversal via THz spectroscopy.
From: Magnetization reversal through an antiferromagnetic state
a Magnetic field-dependent magnetization M(H) at 25 K. Selected segments (A-B and C-D) of the magnetization curve are highlighted by colors to indicate the field regions of the THz data shown in (b) and (c). b THz absorption spectra at 25 K recorded at different magnetic fields (H∥c) ranging between the segment A-B of (a). c THz absorption spectra recorded at different magnetic fields ranging between the segment C-D of (a). The THz spectrum indicated by the symbol × is recorded at the coercive field (see a). d Temperature dependence of the maximum values of xafm at the magnetization reversal obtained directly from the integrated intensity of the AFM mode and the FiM mode (via \(1-{x}_{{{{{{{{\rm{fim}}}}}}}}}\)). The error for the values obtained from the broad FiM mode were estimated to be about 15%, while the error for the narrow AFM mode is smaller than 1% and within the symbol size. For comparison, xafm values obtained from the polarization analysis are reproduced in (d). The solid line is a guide to the eye.
