Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Transport: Molecular Electronics II
TT 72.2: Vortrag
Mittwoch, 2. April 2014, 15:15–15:30, HSZ 304
Noncollinear electronic transport through star-shaped Fe4 nanomagnet — •Volodymyr V. Maslyuk1, Leonid Sandratskii2, and Ingrid Mertig1,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
During the last decade single molecular magnets have attracted huge interest because of their spectacular magnetic properties.
Here we present a theoretical investigation of the star-shaped Fe4(OMe)6(dpm)6 nanomagnets placed between ferromagnetic Co(100) electrodes. We use the combination of the NEGF method and the density-functional theory realized in the TranSIESTA code [1] and adapted for the investigation of the magnetic systems with noncollinear magnetic order. We take into account electron-correlations effects via a Hubbard-like term that was added to our DFT functional. We found that the Fe4 molecule has a magnetic moment of 10 µB in the ground state. We also obtain that the magnetic anisotropy barrier of the molecule is small, 0.33 meV, that allows us to neglect the spin-orbit interaction in the transport properties calculations. The molecule placed between electrodes tends to be antiferromagnetically alined with the magnetization of the leads. We show that the direction of the magnetization of the molecule changes with the variation of the relative directions of the magnetization of the leads. This has an impact on the transmission spectra of the system.
M. Brandbyge, et al, Phys. Rev. B 65, 165401 (2002)