Spiral Exchange Interaction in Diluted Magnetic Semiconductor Junction

We studied the exchange interactions mediated by polarized itinerant carriers in diluted magnetic semiconductor (DMS) junction. In contrast to the ordinary RKKY oscillations, the induced moment possesses an interesting spiral motion, accompanied with angular oscillations. The spiral motion remains robust in the entire $T<T_{c}$ regime while the oscillatory motion gets enhanced as $T \to T_{c}$. To explore the novel phenomena, we propose a ferromagnet/DMS/ferromagnet junction would bring out interesting spin-dependent transport properties and possible applications in spintronics.