Shot noise of charge and spin transport in a junction with a precessing molecular spin
arXiv:1711.06759 · doi:10.1103/PhysRevB.97.115441
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.
arXiv comment10 pages, 8 figure, published version
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Cited by in corpus (4)
- Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions
- Thermodynamics and spin mapping of quantum excitations in a Heisenberg spin heptamer
- Spin transport through a nanojunction with a precessing anisotropic molecular spin: Quantum interference and spin-transfer torque
- Effect of uniaxial magnetic anisotropy on charge transport in a junction with a precessing anisotropic molecular spin