Fabrication of nanogapped single-electron transistors for transport studies of individual single-molecule magnets

Henderson, John; Ramsey, Christopher; Barco, Enrique del; Mishra, Abhudaya; Christou, George

doi:10.1063/1.2671613

Cited by 64 publications

(80 citation statements)

References 18 publications

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“…The study of the Au-Au bonding was inspired by an experimental effort to increase conductance through small molecules using Au-Au bonding. 25 In the geometry with the Au-Au bonding ͓Geo 1 : Au-͑AuC 3 The study of the geometries with physisorption and without linker molecules, was motivated by the transport measurement through the Mn 12 without any linker molecules. 2 We consider such geometries in the orientation ͑2͒.…”

Section: A Interface Geometries Consideredmentioning

confidence: 99%

“…Recently, molecular junctions based on single-molecule magnets ͑SMMs͒ connected to electrodes or monolayers of SMMs at surfaces, have been fabricated and their electron-transport characteristics [1][2][3][4][5][6] have been measured, as well as their mechanical, electronic, and magnetic properties. [7][8][9][10][11][12][13] Electron transport through an SMM drew a lot of attention because of the intriguing interplay between its transport properties and the internal magnetic degrees of freedom, which is absent in transport through small organic molecules.…”

Section: Introductionmentioning

confidence: 99%

“…[32][33][34] An SMM Mn 12 initially synthesized by Lis 30 consists of ligands which do not form direct chemical bonding to an Au surface. Thus, most transport experiments through an Mn 12 within Au electrodes were performed on systems where the Mn 12 molecules are chemically bonded to surfaces or electrodes via linker molecules such as a thiol group, 1,3,5 or physically adsorbed onto surfaces or electrodes without any linker molecules. 2 To form direct Au-S bonding, some of the original ligands of the Mn 12 molecules 30 were substituted by S-containing ligands or the Mn 12 molecules were deposited onto an Au surface that was initially functionalized with S-containing alkane chains.…”

Section: Introductionmentioning

confidence: 99%

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Effects of bonding type and interface geometry on coherent transport through the single-molecule magnetMn12

et al. 2010

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We examine theoretically coherent electron transport through the single-molecule magnet Mn 12 , bridged between Au͑111͒ electrodes, using the nonequilibrium Green's function method and the density-functional theory. We analyze the effects of bonding type, molecular orientation, and geometry relaxation on the electronic properties and charge and spin transport across the single-molecule junction. We consider nine interface geometries leading to five bonding mechanisms and two molecular orientations: ͑i͒ Au-C bonding, ͑ii͒ Au-Au bonding, ͑iii͒ Au-S bonding, ͑iv͒ Au-H bonding, and ͑v͒ physisorption via van der Waals forces. The two molecular orientations of Mn 12 correspond to the magnetic easy axis of the molecule aligned perpendicular ͓hereafter denoted as orientation ͑1͔͒ or parallel ͓orientation ͑2͔͒ to the direction of electron transport. We find that the electron transport is carried by the lowest unoccupied molecular orbital ͑LUMO͒ level in all the cases that we have simulated. Relaxation of the junction geometries mainly shifts the relevant occupied molecular levels toward the Fermi energy as well as slightly reduces the broadening of the LUMO level. As a result, the current slightly decreases at low bias voltage. Our calculations also show that placing the molecule in the orientation ͑1͒ broadens the LUMO level much more than in the orientation ͑2͒ due to the internal structure of the Mn 12 . Consequently, junctions with the former orientation yield a higher current than those with the latter. Among all of the bonding types considered, the Au-C bonding gives rise to the highest current ͑about one order of magnitude higher than the Au-S bonding͒, for a given distance between the electrodes. The current through the junction with other bonding types decreases in the order of Au-Au, Au-S, and Au-H. Importantly, the spin-filtering effect in all the nine geometries stays robust and their ratios of the majority-spin to the minorityspin transmission coefficients are in the range of 10 3 -10 8 . The general trend in transport among the different bonding types and molecular orientations obtained from this study may be applicable to other single-molecule magnets.

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Section: A Interface Geometries Consideredmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of bonding type and interface geometry on coherent transport through the single-molecule magnetMn12

et al. 2010

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“…One of the powerful methods to probe intrinsic properties of molecular nanomagnets is the transport measurements through the junctions consisting of them [10,11,12]. An example is the direct observation of their magnetic states and their easy axis orientations by three-terminal measurements of charge transport [13].…”

Section: Introductionmentioning

confidence: 99%

Spin nutation effects in molecular nanomagnet–superconductor tunnel junctions

Abouie¹,

Abdollahipour²,

Rostami³

2013

J. Phys.: Condens. Matter

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Abstract. We study the spin nutation effects of the molecular nanomagnet on the Josephson current through a superconductor|molecular nanomagnet|superconductor tunnel junction. We explicitly demonstrate that due to the spin nutation of the molecular nanomagnet two oscillatory terms emerge in the ac Josephson current in addition to the conventional ac Josephson current. Some resonances occur in the junction due to the interactions of the transported quasiparticles with the bias voltage and molecular nanomagnet spin dynamics. The appearance of them indicate that the energy exchanged during these interactions is in the range of the superconducting energy gap. We also show that the spin nutation is able to convert the ac Josephson current to a dc one which is interesting for applications.PACS numbers: 74.50.+r, 75.50.Xx, 75.78.-n ‡ These authors have contributed equally to this work.

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“…1,2,3,4 Both of the experimental techniques face their own challenges in transport measurements, so do theoretical and computational studies of the systems. So far, there were no experimental or theoretical inputs on the interfaces between SMMs and electrodes.…”

mentioning

confidence: 99%

Spin-filtering effect in the transport through a single-molecule magnet Mn12 bridged between metallic electrodes

Barraza‐Lopez

Park

García‐Suárez

et al. 2009

Journal of Applied Physics

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Electronic transport through a single-molecule magnet Mn 12 in a two-terminal set up is calculated using the non-equilibrium Green's function method in conjunction with density-functional theory.A single-molecule magnet Mn 12 is bridged between Au(111) electrodes via thiol group and alkane chains such that its magnetic easy axis is normal to the transport direction. A computed spinpolarized transmission coefficient in zero-bias reveals that resonant tunneling near the Fermi level occurs through some molecular orbitals of majority spin only. Thus, for low bias voltages, a spinfiltering effect such as only one spin component contributing to the conductance, is expected. This effect would persist even with inclusion of additional electron correlations.

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Fabrication of nanogapped single-electron transistors for transport studies of individual single-molecule magnets

Cited by 64 publications

References 18 publications

Effects of bonding type and interface geometry on coherent transport through the single-molecule magnetMn12

Effects of bonding type and interface geometry on coherent transport through the single-molecule magnetMn12

Spin nutation effects in molecular nanomagnet–superconductor tunnel junctions

Spin-filtering effect in the transport through a single-molecule magnet Mn12 bridged between metallic electrodes

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