A Study of Rotational Switching

Abstract

Switching signals by pulsed magnetic fields up to 40 Oe were observed on a single‐crystal YIG window frame with legs along directions. A clear magnetic oscillation (∼175 Mc) was found for fields less than about 3 Oe. The amplitude and the damping of the oscillation are enlarged by increasing the drive further, and finally the total remagnetization signal coincides with the initial pulse of the oscillation. Two critical fields H_c² (7.7 Oe) and H_c³ (20 Oe) were found which correspond to the theoretical minimum critical field for rotational switching for this geometry and to the observed onset of the single‐pulse remagnetization, respectively. Switching coefficients of the order of 0.2 μsec Oe and 0.1 μsec Oe are obtained in the regions below and above H_c², respectively. It is suggested that the nucleation and/or growth of small reversed domains in the early stages of flux reversal may create magnetostatic fields which play an important role in determining the characteristics of these two regions and that it might be better called a noncoherent oscillatory rotational mode.