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arXiv · 1303.3283

Electric control of a $\{Fe_4\}$ single-molecule magnet in a single-electron transistor

J. F. Nossa·M. Fhokrul Islam·C. M. Canali·M. R. Pederson
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Abstract

Using first-principles methods we study theoretically the properties of an individual $\{Fe_4\}$ single-molecule magnet (SMM) attached to metallic leads in a single-electron transistor geometry. We show that the conductive leads do not affect the spin ordering and magnetic anisotropy of the neutral SMM. On the other hand, the leads have a strong effect on the anisotropy of the charged states of the molecule, which are probed in Coulomb blockade transport. Furthermore, we demonstrate that an external electric potential, modeling a gate electrode, can be used to manipulate the magnetic properties of the system. For a charged molecule, by localizing the extra charge with the gate voltage closer to the magnetic core, the anisotropy magnitude and spin ordering converges to the values found for the isolated $\{Fe_4\}$ SMM. We compare these findings with the results of recent quantum transport experiments in three-terminal devices.

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J. F. Nossa, M. Fhokrul Islam, C. M. Canali, M. R. Pederson. 2013-03-13. Electric control of a $\{Fe_4\}$ single-molecule magnet in a single-electron transistor. https://doi.org/10.1103/physrevb.88.224423

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