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Electrical and Thermal Control of Magnetic Exchange Interactions
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 25, 257201- p.Article in journal (Refereed) Published
Abstract [en]

We investigate the far-from-equilibrium nature of magnetic anisotropy and exchange interactions between molecular magnets embedded in a tunnel junction. By mapping to an effective spin model, these magnetic interactions can be divided into three types: isotropic Heisenberg, anisotropic Ising, and anisotropic Dzyaloshinski-Moriya contributions, which are attributed to the background nonequilibrium electronic structures. We further demonstrate that both the magnetic self- and exchange interactions can be controlled either electrically by gating and tuning the voltage bias, or thermally by adjusting the temperature bias. We show that the Heisenberg and Ising interactions scale linearly, while the Dzyaloshinski-Moriya interaction scales quadratically, with the molecule-lead coupling strength. The interactions scale linearly with the effective spin polarizations of the leads and the molecular coherence. Our results pave a way for smart control of magnetic exchange interactions at atomic and molecular levels.

Place, publisher, year, edition, pages
2014. Vol. 113, no 25, 257201- p.
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URN: urn:nbn:se:uu:diva-242868DOI: 10.1103/PhysRevLett.113.257201ISI: 000346865000016OAI: oai:DiVA.org:uu-242868DiVA: diva2:785747
Available from: 2015-02-03 Created: 2015-02-02 Last updated: 2017-12-05Bibliographically approved

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Fransson, Jonas

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