Time-dependent spin and transport properties of a single-molecule magnet in a tunnel junction

H. Hammar and J. Fransson
Phys. Rev. B 94, 054311 – Published 18 August 2016; Erratum Phys. Rev. B 98, 219907 (2018)

Abstract

In single-molecule magnets, the exchange between a localized spin moment and the electronic background provides a suitable laboratory for studies of dynamical aspects of both local spin and transport properties. Here we address the time evolution of a localized spin moment coupled to an electronic level in a molecular quantum dot embedded in a tunnel junction between metallic leads. The interactions between the localized spin moment and the electronic level generate an effective interaction between the spin moment at different instances in time. Therefore, we show that, despite being a single-spin system, there are effective contributions of isotropic Heisenberg and anisotropic Ising and Dzyaloshinski-Moriya character acting on the spin moment. The interactions can be controlled by gate voltage, voltage bias, the spin polarization in the leads, in addition to external magnetic fields. Signatures of the spin dynamics are found in the transport properties of the tunneling system, and we demonstrate that measurements of the spin current may be used for readout of the local spin moment orientation.

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  • Received 3 March 2016
  • Revised 29 June 2016

DOI:https://doi.org/10.1103/PhysRevB.94.054311

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Erratum

Authors & Affiliations

H. Hammar and J. Fransson*

  • Department of Physics and Astronomy, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden

  • *Jonas.Fransson@physics.uu.se

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Issue

Vol. 94, Iss. 5 — 1 August 2016

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