Fractional Conductance Quantization in Metallic Nanoconstrictions under Electrochemical Potential Control

Shu, Chaozhu; Li, C. Z.; He, Huixin; Bogozi, A.; Bunch, J. Scott; Tao, Nongjian

doi:10.1103/physrevlett.84.5196

Cited by 104 publications

(128 citation statements)

References 18 publications

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“…The issue with a micro-gap prepared in this way is that the copper is 20 μm thick. Figure 2 shows the resistance feedback controlled electroplating process [20]. In this figure, the working electrodes (W 1 and W 2 ) are the two copper film electrodes, CE is the Pt counter electrode, and REF is the saturated calomel electrode.…”

Section: Resultsmentioning

confidence: 99%

Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition

et al. 2012

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A "T" shaped micro-gap was fabricated by mechanical polishing between two Cu film electrodes on the surface of single-sided bonded copper. A nano-gap was then fabricated in the prepared micro-gap by resistance feedback controlled electroplating. Finally Ni 80 Fe 20 ferromagnetic nanocontacts of several sizes were fabricated in the prepared nano-gap by resistance feedback controlled electroplating. The magnetoresistance of each Ni 80 Fe 20 ferromagnetic nanocontact was not related to its size. Fabrication of the Ni 80 Fe 20 ferromagnetic nanocontacts in the nano-gap can reduce the contribution of magnetostriction to the magnetoresistance. The magnetoresistance values of the Ni 80 Fe 20 ferromagnetic nanocontacts were as high as those of the Ni ferromagnetic nanocontacts. This implies that the contribution of magnetostriction to the ballistic magnetoresistance of the ferromagnetic nanocontacts can be neglected. The ferromagnetic nanocontacts fabricated in this study, and in other cases, have two anisotropic interfaces on the sides of the nanocontacts. However, the magnetic field can alter the contribution of the interaction between the two anisotropic interfaces to the ballistic magnetoresistance of the ferromagnetic nanocontacts, and this effect can not be ruled out yet. ferromagnetic nanocontacts, resistance feedback controlled electroplating, ballistic magnetoresistance Citation:Cheng H, Yang W, Liu H, et al. Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition.

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Section: Resultsmentioning

confidence: 99%

Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition

et al. 2012

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“…These facts make possible to fabricate very stable metal nanowires, which has not been prepared in UHV. Fabrication of stable Au, Ag, Cu, Pb, Fe, Co, Ni, and Pd nanowires and interesting phenomena characteristic of the electrochemical system have been reported in solution at room temperature [3][4][5][6][7]. Although a Cu nanowire in a solution was more stable than that in UHV at room temperature, the stretched length of the nanowire was still rather short, typically less than 0.1 nm.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the electrochemical method has been recognized to be a powerful approach to fabricate stable metal nanowires [3][4][5][6][7]. Electrochemical potential determines the potential energy of the electrons of the nanowires, resulting in the control of the bonding strength between the metal atoms, and the interaction of the metals with molecules of surrounding medium.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of stable metal nanowire showing conductance quantization in solution

2007

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We have mechanically fabricated Cu nanowires in solutions with and without thiourea. In both solutions, the conductance was quantized in units of G 0 ( ). A well-defined 1 G h e / 2 2 0 peak was observed in the conductance histogram. While the conductance value was not changed, the stability of the mono atomic contact was improved by adding thiourea. The effect of thiourea on the stability of the atomic contact was investigated by measuring the stretched length of the atomic contact. The average length of the last plateau was 0.044 nm in the solution without thiourea. The length increased to 0.076 nm in the solution with thiourea. The stabilization could be explained by the decrease in the surface energy caused by adsorption of thiourea molecules on the Cu nanowires.

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“…Recently, preparation of metal nanowires under electrochemical potential control has attracted wide attention [9][10][11][12][13]. Electrochemical potential determines the potential energy of electrons in metal nanowires, resulting in control of the bonding strength between the metal atoms in the wires and the interaction between the metals and molecules in the surrounding medium.…”

Section: Introductionmentioning

confidence: 99%

“…These characteristics lead to successful fabrication of very stable metal nanowires, which cannot be prepared in UHV. Relatively stable Au [9], Ag, Cu, Pb [10], Fe, Co, Ni [11], and Pd [12] metal nanowires were fabricated in solution at room temperature with the aid of electrochemical potential control. Furthermore, the stability and structure of Au mono atomic wires was controlled by the electrochemical potential [13].…”

Section: Introductionmentioning

confidence: 99%

Electric conductance of metal nanowires at mechanically controllable break junctions under electrochemical potential control

2007

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We have developed the mechanically controllable break junction setup with an electrochemical cell (EC-MCBJ) to measure the electric conductance of metal nanowires under electrochemical potential control. The electric conductance of Au nanowires was investigated in 0.1 M Na 2 SO 4 solution using EC-MCBJ. The conductance of the Au nanowires was quantized in units of G 0 (=2e 2 /h), showing clear features in the conductance histogram. The atomic contact with a specific conductance value was kept for more than 5 sec, indicating the relatively high stability of the present EC-MCBJ system.

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Fractional Conductance Quantization in Metallic Nanoconstrictions under Electrochemical Potential Control

Cited by 104 publications

References 18 publications

Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition

Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition

Fabrication of stable metal nanowire showing conductance quantization in solution

Electric conductance of metal nanowires at mechanically controllable break junctions under electrochemical potential control

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