Stretching single atom contacts at multiple subatomic step-length

Wei, Yi Min; Liang, Jing Hong; Chen, Zhao Bin; Zhou, Xiao‐Shun; Mao, Bing; Oviedo, Oscar Alejandro; Leiva, E.P.M.

doi:10.1039/c3cp50473e

Cited by 7 publications

(3 citation statements)

References 58 publications

(67 reference statements)

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“…The importance of the jump-to-contact strategy is two-fold. First, the Fe clusters have well-defined crystalline structure which in turn establishes the surface structure of the substrate; 31,32 this observation is supported by atom dynamics simulations. 33 Second, the Fe clusters are single domain ferromagnetic particles with strong shape anisotropy.…”

Section: ■ Results and Discussionmentioning

confidence: 75%

Giant Single-Molecule Anisotropic Magnetoresistance at Room Temperature

Li¹,

Bai

Chen³

et al. 2015

J. Am. Chem. Soc.

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We report an electrochemically assisted jump-to-contact scanning tunneling microscopy (STM) break junction approach to create reproducible and well-defined single-molecule spintronic junctions. The STM break junction is equipped with an external magnetic field either parallel or perpendicular to the electron transport direction. The conductance of Fe-terephthalic acid (TPA)-Fe single-molecule junctions is measured and a giant single-molecule tunneling anisotropic magnetoresistance (T-AMR) up to 53% is observed at room temperature. Theoretical calculations based on first-principles quantum simulations show that the observed AMR of Fe-TPA-Fe junctions originates from electronic coupling at the TPA-Fe interfaces modified by the magnetic orientation of the Fe electrodes with respect to the direction of current flow. The present study highlights new opportunities for obtaining detailed understanding of mechanisms of charge and spin transport in molecular junctions and the role of interfaces in determining the MR of single-molecule junctions.

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Section: ■ Results and Discussionmentioning

confidence: 75%

Giant Single-Molecule Anisotropic Magnetoresistance at Room Temperature

Li¹,

Bai

Chen³

et al. 2015

J. Am. Chem. Soc.

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“…Thus, the different conductance values between contacts with Cu clusters and Au electrodes can be attributed (or at least mainly attributed) to the different electrode material in the junctions. Interestingly, metal clusters created by the ECSTM-BJ approach have well-defined crystallographic structure [39,59].…”

Section: The Influence Of the Metal Electrodementioning

confidence: 99%

Conductance measurement of pyridyl-based single molecule junctions with Cu and Au contacts

Zhou

Peng²,

Sun³

et al. 2013

Nanotechnology

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We studied the conductance of pyridyl-based single molecule junctions with Cu contacts by using an electrochemical jump-to-contact scanning tunneling microscopy break junction (ECSTM-BJ) approach. The single molecule junctions of 4,4'-bipyridine (BPY), 1,2-di(pyridin-4-yl)ethene (BPY-EE) and 1,2-di(pyridin-4-yl)ethane (BPY-EA) bridged with Cu clusters show three sets of conductance values. These values are smaller than the conductance values of single molecule junctions with Au electrodes measured by the traditional scanning tunneling microscopy break junction in acidic or neutral solutions, which can be attributed to the different electronic coupling efficiencies between molecules and electrodes. The consistent conductance of pyridyl-based molecules in acidic and neutral solutions may show that the protonated pyridyl group contacts to the electrode through the deprotonated form.

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“…There are two basic approaches to fabricating such systems: mechanically controlled deformation of thin metallic junctions 8 , 27 – 30 , and electrochemical techniques 31 – 37 . In the latter a gap between two electrodes is bridged by the electrochemical deposition of a metal until contact is reached and a nanowire established.…”

Section: Introductionmentioning

confidence: 99%

Copper Nanowires through Oriented Mesoporous Silica: A Step towards Protected and Parallel Atomic Switches

Smida

Ghilane

et al. 2017

Sci Rep

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The formation of copper atomic contacts has been investigated. Copper nanowires were grown by electrochemical deposition, in the scanning electrochemical microscopy (SECM) configuration, from a platinum microelectrode to an indium tin oxide (ITO) substrate. Self-termination leaves copper filaments between the two electrodes with an atomic point contact at the ITO electrode. Histogram analysis shows that the conductance of this contact is close to, or less than, 1 G0. Atomic contacts were also fabricated on ITO electrodes covered with vertically-aligned mesoporous silica films. Scanning Transmission Electron Microscopy images show that copper filaments occupy individual isolated nanopores. Contacts generated on bare ITO break down rapidly in sodium salicylate, whereas those generated in ITO/nanopores are unaffected; the nanopores protect the copper filaments. Finally, atomic switch behaviour was obtained using these ITO and ITO/nanopores electrodes.

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Stretching single atom contacts at multiple subatomic step-length

Cited by 7 publications

References 58 publications

Giant Single-Molecule Anisotropic Magnetoresistance at Room Temperature

Giant Single-Molecule Anisotropic Magnetoresistance at Room Temperature

Conductance measurement of pyridyl-based single molecule junctions with Cu and Au contacts

Copper Nanowires through Oriented Mesoporous Silica: A Step towards Protected and Parallel Atomic Switches

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