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.
Original language | English |
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Article number | 2591 |
Journal | Scientific reports |
Volume | 3 |
DOIs | |
Publication status | Published - 2013 |
Externally published | Yes |
Bibliographical note
Funding Information:Financial support from the Alessandro and Piermaria Reggiori Fellowship, the Bertucci Graduate Fellowship, the Department of Materials Science and Engineering at Carnegie Mellon University, Intel Corporation, SRC Tasks 1292.008, 2121.001, 2323.001 and NSF DMR-0805155 are acknowledged.
ASJC Scopus subject areas
- General