Current fluctuations driven by ferromagnetic and antiferromagnetic resonance

Arne Brataas, NTNU Trondheim

When spins in magnetic materials precess, they emit currents into the surrounding conductors. We will explain how dynamical magnets also induce current noise. The shot noise characterizes and detects magnetic resonance and new aspects of electron transport in magnetic nanostructures.

We generalize the description of current fluctuations driven by spin dynamics in three ways using scattering theory. First, our approach describes a general junction with any given electron scattering properties. Second, we consider antiferromagnets as well as ferromagnets. Third, we treat multiterminal devices.

We give results for various junctions, such as ballistic and disordered contacts. Finally, we discuss the experimental consequences.

PDF file of the talk available here