Crystallographic anisotropy of the resistivity size effect in single crystal tungsten nanowires.

Abstract:

:This work demonstrates an anisotropic increase in resistivity with decreasing width in single crystal tungsten (W) nanowires having a height of 21 nm. Nanowire-widths were in the range of 15-451 nm, with the anisotropy observed for widths below 50 nm. The longitudinal directions of the nanowires coincided with the <100>, <110> and <111> orientations of the body centered cubic phase of W. The resistivity increase was observed to be minimized for the <111>-oriented single crystal nanowires, exhibiting a factor of two lower increase in resistivity at a width of ~15 nm, relative to the thin film resistivity (i.e., an infinitely wide wire). The observed anisotropy is attributed to crystallographic anisotropy of the Fermi velocity and the resultant anisotropy of the electron mean free path in W, and underscores the critical role of crystallographic orientation in nanoscale metallic conduction.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Choi D,Moneck M,Liu X,Oh SJ,Kagan CR,Coffey KR,Barmak K

doi

10.1038/srep02591

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

2591

issn

2045-2322

pii

srep02591

journal_volume

3

pub_type

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