Abstract
The existence of a current-induced spin fluctuation state in mesoscopic systems such as a dilute magnetic semiconductor system is predicted. Coherent electron transport and the dynamics of the local spins of a ferromagnetic nanopillar system is investigated numerically. The $s\text{\ensuremath{-}}d$ exchange coupling between the spins of the conduction electrons and the local spins is taken into account. An interference related nonuniform spin-polarized current causes a nonuniform spin transfer torque. This generates a spatiotemporal fluctuation state in the local spin system. Above some critical diameter of the wire, a transition from an ordered ferromagnetic to a spin fluctuation state occurs when the current density exceeds a critical value. We provide numerical evidence that such a magnetic nonequilibrium state is signaled by conductance fluctuations at sufficiently low temperatures.
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