Arne Brataas (NUST, Norway)

Date: Mon. November 9th, 2020, 12:45 pm-1:45 pm
Location: via Zoom (ID: 98963301598; Password: 884531)
Website: https://www.ntnu.edu/employees/arne.brataas

Current Fluctuations Driven by Magnetic Resonance

Arne Brataas

Department of Physics, Norwegian University of Science and Technology

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.

Short bio:

Arne Brataas received his Ph.D. in physics from the Norwegian University of Science and Technology in 1997. He is the director of the Center of Excellence QuSpin (https://www.ntnu.edu/quspin). He has been a postdoctoral fellow at TU Delft (1997-1999) and Harvard University (1999-2002) and, since 2002, professor at his alma mater. He was the chairman of the Kavli Prize Committee in Nanoscience (2013-2019) and a recipient of the 2015 ERC Advanced Grant. His main interests are the theory of spin transport and dynamics in insulating and conducting nanostructured materials.

Host: Shulei Zhang