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Title: Magnetoresistance characteristics in individual Fe{sub 3}O{sub 4} single crystal nanowire

We report on the magnetoresistance (MR) and electron transport measurements observed on a single crystal magnetite nanowire prepared using a hydrothermal synthesis method. High-resolution electron microscopy revealed the single crystal magnetite nanowires with 80–120 nm thickness and up to 8 μm in length. Magnetic measurements showed the typical Verwey transition around 120 K with a 100 Oe room temperature coercivity and 45 emu/g saturation magnetization, which are comparable to bulk magnetite. Electrical resistance measurements in 5–300 K temperature range were performed by scanning gate voltage and varying applied magnetic field. Electrical resistivity of the nanowire was found to be around 5 × 10{sup −4} Ω m, slightly higher than the bulk and has activation energy of 0.07 eV. A negative MR of about 0.7% is observed for as-synthesized nanowires at 0.3 T applied field. MR scaled with increasing applied magnetic field representing the field-induced alignment of magnetic domain. These results are attributed to the spin-polarized electron transport across the antiphase boundaries, which implicate promising applications for nanowires in magnetoelectronics.
Authors:
; ;  [1] ;  [2]
  1. Department of Physics, Boise State University, Boise, Idaho 83725 (United States)
  2. School of Engineering, Brown University, Providence, Rhode Island 02912 (United States)
Publication Date:
OSTI Identifier:
22410130
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; COERCIVE FORCE; COMPARATIVE EVALUATIONS; ELECTRIC POTENTIAL; ELECTRON MICROSCOPY; FERRITES; HYDROTHERMAL SYNTHESIS; MAGNETIC FIELDS; MAGNETITE; MAGNETIZATION; MAGNETORESISTANCE; MONOCRYSTALS; NANOWIRES; PHASE TRANSFORMATIONS; SPIN ORIENTATION; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K