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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 (Engelska)Ingår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 87, artikel-id 045426Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2013. Vol. 87, artikel-id 045426
Nationell ämneskategori
Den kondenserade materiens fysik
Forskningsämne
Fysik, Kondenserade materians fysik
Identifikatorer
URN: urn:nbn:se:lnu:diva-63806DOI: 10.1103/PhysRevB.87.045426OAI: oai:DiVA.org:lnu-63806DiVA, id: diva2:1095364
Anmärkning

Correction published in: Filipovic, Milena et al. 2013. Erratum: Spin transport and tunable Gilbert damping in a single-molecule magnet junction [Phys. Rev. B 87, 045426 (2013)], Physical Review B, 88: 119901.

Tillgänglig från: 2017-05-12 Skapad: 2017-05-12 Senast uppdaterad: 2018-08-30Bibliografiskt granskad

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