Spiral Exchange Interaction in Diluted Magnetic Semiconductor Junction

TL;DR

This paper investigates the unique spiral exchange interactions in diluted magnetic semiconductor junctions, revealing novel spin-dependent phenomena with potential spintronics applications.

Contribution

It introduces the concept of spiral exchange interactions mediated by polarized carriers in DMS junctions, contrasting with traditional RKKY oscillations.

Findings

Spiral motion of induced magnetic moments persists below T_c.

Oscillatory behavior intensifies as temperature approaches T_c.

Proposes ferromagnet/DMS/ferromagnet junctions for spintronic devices.

Abstract

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.