Growth and Physical Property Study of Single Nanowire (Diameter ~45 nm) of Half Doped Manganite

Journal Article · Tue Jan 01 00:00:00 EST 2013 · Journal of Nanomaterials

DOI:https://doi.org/10.1155/2013/162315· OSTI ID:1198229

Datta, Subarna ^[1]; Chandra, Sayan ^[2]; Samanta, Sudeshna ^[1]; Das, K. ^[1]; Srikanth, H. ^[2]; Ghosh, Barnali ^[1]

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1. Unit for Nanoscience, Department of Condensed Matter Physics and Material Sciences, S.N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata 700098, India
2. Department of Physics, University of South Florida, Tampa, FL 33620, USA

We report here the growth and characterization of functional oxide nanowire of hole doped manganite of La _0.5 Sr _0.5 MnO ₃ (LSMO). We also report four-probe electrical resistance measurement of a single nanowire of LSMO (diameter ~45 nm) using focused ion beam (FIB) fabricated electrodes. The wires are fabricated by hydrothermal method using autoclave at a temperature of 270 °C. The elemental analysis and physical property like electrical resistivity are studied at an individual nanowire level. The quantitative determination of Mn valency and elemental mapping of constituent elements are done by using Electron Energy Loss Spectroscopy (EELS) in the Transmission Electron Microscopy (TEM) mode. We address the important issue of whether as a result of size reduction the nanowires can retain the desired composition, structure, and physical properties. The nanowires used are found to have a ferromagnetic transition ( $T_C$ ) at around 325 K which is very close to the bulk value of around 330 K found in single crystal of the same composition. It is confirmed that the functional behavior is likely to be retained even after size reduction of the nanowires to a diameter of 45 nm. The electrical resistivity shows insulating behavior within the measured temperature range which is similar to the bulk system.

• Sponsoring Organization: USDOE
• Grant/Contract Number: FG02-07ER46438
• OSTI ID: 1198229
• Journal Information: Journal of Nanomaterials, Journal Name: Journal of Nanomaterials Vol. 2013; ISSN 1687-4110
• Publisher: Hindawi Publishing Corporation
• Country of Publication: Egypt
• Language: English