Control of Ferromagnetism in a (Ga,Mn)As - Based Multiferroic System via a Ferroelectric Gate

We report the implementation of a ferroelectric gate field effect transistor (FeFET) with a ferromagnetic (Ga,Mn)As conducting channel. The Curie temperature T-C in the channel is modulated by non-volatile poling of the gate. The ferroelectric state, and thus also the altered ferromagnetic behavior, persists for periods of more than a week. T-C control is demonstrated by resistance, magnetotransport and hysteresis measurements.