Investigation of the ESR modes in Cu-Mn spin glasses via swept frequency spectroscopy (abstract)

Abstract

We have developed a new swept frequency spectrometer (8–12 GHz) which is designed to allow direct observation of all the ESR modes in Cu-Mn spin-glass samples. When the rf and dc magnetic fields are perpendicular, we readily observe the ω+ mode either by sweeping the field (corresponding to the usual spectroscopy) or sweeping the frequency (our new approach). When the fields are parallel, we observe signals when sweeping the frequency which appear to correspond to the longitudinal mode ωL, but the signal behavior is not as simple as expected from the current triad theory and observations.