Shot noise of charge and spin transport in a junction with a precessing molecular spin

TL;DR

This paper investigates the shot noise in charge and spin transport through a magnetic molecule junction with a precessing spin, revealing how noise features relate to quantum interference, damping, and coherence in spin transport.

Contribution

It provides a detailed analysis of charge and spin-torque shot noise in a molecular spin junction, linking noise features to interference effects and damping, advancing understanding of spin coherence.

Findings

Charge current noise exhibits step-like features with dips due to interference.

Spin-torque noise components relate to Gilbert damping and are experimentally accessible.

Noise characteristics reveal details about spin coherence in magnetic molecular contacts.

Abstract

Magnetic molecules and nanomagnets can be used to influence the electronic transport in mesoscopic junction. In a magnetic field the precessional motion leads to resonances in the dc- and ac-transport properties of a nanocontact, in which the electrons are coupled to the precession. Quantities like the dc-conductance or the ac-response provide valuable information like the level structure and the coupling parameters. Here, we address the current noise properties of such contacts. This encompasses the charge current and spin-torque shot noise, which both show a step-like behavior as functions of bias voltage and magnetic field. The charge current noise shows pronounced dips around the steps, which we trace back to interference effects of electron in quasienergy levels coupled by the molecular spin precession. We show that some components of the noise of the spin-torque currents are directly related to the Gilbert damping and, hence, are experimentally accessible. Our results show that the noise characteristics allow to investigate in more detail the coherence of spin transport in contacts containing magnetic molecules.