  We investigate the current-voltage characteristics of a II-VI semiconductor
resonant-tunneling diode coupled to a diluted magnetic semiconductor injector.
As a result of an external magnetic field, a giant Zeeman splitting develops in
the injector, which modifies the band structure of the device, strongly
affecting the transport properties. We find a large increase in peak amplitude
accompanied by a shift of the resonance to higher voltages with increasing
fields. We discuss a model which shows that the effect arises from a
combination of three-dimensional incident distribution, giant Zeeman spin
splitting and broad resonance linewidth.
