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Spin transport and tunable Gilbert damping in a single-molecule magnet junction
Universität Konstanz, Germany.
Universität Konstanz, Germany.ORCID iD: 0000-0001-5551-8980
RWTH Aachen, Germany.
Universität Konstanz, Germany.
2013 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 87, 045426Article in journal (Refereed) Published
Abstract [en]

We study time-dependent electronic and spin transport through an electronic level connected to two leads and coupled with a single-molecule magnet via exchange interaction. The molecular spin is treated as a classical variable and precesses around an external magnetic field. We derive expressions for charge and spin currents by means of the Keldysh nonequilibrium Green's functions technique in linear order with respect to the time-dependent magnetic field created by this precession. The coupling between the electronic spins and the magnetization dynamics of the molecule creates inelastic tunneling processes which contribute to the spin currents. The inelastic spin currents, in turn, generate a spin-transfer torque acting on the molecular spin. This back-action includes a contribution to the Gilbert damping and a modification of the precession frequency. The Gilbert damping coefficient can be controlled by the bias and gate voltages or via the external magnetic field and has a nonmonotonic dependence on the tunneling rates.

Place, publisher, year, edition, pages
2013. Vol. 87, 045426
National Category
Condensed Matter Physics
Research subject
Physics, Condensed Matter Physics
Identifiers
URN: urn:nbn:se:lnu:diva-63806DOI: 10.1103/PhysRevB.87.045426OAI: oai:DiVA.org:lnu-63806DiVA: diva2:1095364
Available from: 2017-05-12 Created: 2017-05-12 Last updated: 2017-05-15Bibliographically approved

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Holmqvist, Cecilia
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Physical Review B
Condensed Matter Physics

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