Transport properties of spin field-effect transistors built on Si and InAs

We investigate the properties of ballistic spin field-effect transistors (SpinFETs). First we show that the amplitude of the tunneling magnetoresistance oscillations decreases dramatically with increasing temperature in SpinFETs with the semiconductor channel made of InAs. We also demonstrate that the [100] orientation of the silicon fin is preferred for practical realizations of silicon SpinFETs due to stronger modulation of the conductance as a function of spin-orbit interaction and magnetic field.