Published June 16, 2017 | Version v1
Journal article Metadata-only

Synthesis and magnetic properties of cobalt-iron/cobalt-ferrite soft/hard magnetic core/shell nanowires

Creators

  • 1. Institute of Polymer Technology and Nanotechnology (ITPN-CONICET), Faculty of Engineering, University of Buenos Aires, CP 1127, Buenos Aires (Argentina)
  • 2. Institute of Physics 'Gleb Wataghin', UNICAMP, 13083-970 Campinas SP (Brazil)
  • 3. Institute of Technology and Engineering Sciences 'Hilario Fernández Long' (INTECIN-CONICET), Faculty of Engineering, University of Buenos Aires, CP 1063, Buenos Aires (Argentina)
  • 4. Faculty of Natural Resources, National University of Formosa-CONICET, Campus Universitario, Modulo I, Av. Gutnisky 3200, Formosa (Argentina)

Description

A straightforward method for the synthesis of CoFe2.7/CoFe2O4 core/shell nanowires is described. The proposed method starts with a conventional pulsed electrodeposition procedure on alumina nanoporous template. The obtained CoFe2.7 nanowires are released from the template and allowed to oxidize at room conditions over several weeks. The effects of partial oxidation on the structural and magnetic properties were studied by x-ray spectrometry, magnetometry, and scanning and transmission electron microscopy. The results indicate that the final nanowires are composed of 5 nm iron-cobalt alloy nanoparticles. Releasing the nanowires at room conditions promoted surface oxidation of the nanoparticles and created a CoFe2O4 shell spinel-like structure. The shell avoids internal oxidation and promotes the formation of bi-magnetic soft/hard magnetic core/shell nanowires. The magnetic properties of both the initial single-phase CoFe2.7 nanowires and the final core/shell nanowires, reveal that the changes in the properties from the array are due to the oxidation more than effects associated with released processes (disorder and agglomeration). (paper)

Availability note (English)

Available from http://dx.doi.org/10.1088/1361-6528/aa7010

Additional details

Identifiers

DOI
10.1088/1361-6528/aa7010;

Publishing Information

Journal Title
Nanotechnology (Print)
Journal Volume
28
Journal Issue
24
Journal Page Range
[10 p.]
ISSN
0957-4484

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
50043097
Subject category
S77: NANOSCIENCE AND NANOTECHNOLOGY;
Descriptors DEI
ALUMINIUM OXIDES; BINARY ALLOY SYSTEMS; COBALT COMPOUNDS; ELECTRODEPOSITION; FERRITES; IRON COMPOUNDS; MAGNETIC CORES; MAGNETIC PROPERTIES; NANOPARTICLES; NANOWIRES; SURFACES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY SPECTROSCOPY
Descriptors DEC
ALLOY SYSTEMS; ALUMINIUM COMPOUNDS; CHALCOGENIDES; DEPOSITION; ELECTROLYSIS; ELECTRON MICROSCOPY; FERRIMAGNETIC MATERIALS; IRON COMPOUNDS; LYSIS; MAGNETIC MATERIALS; MAGNETIC STORAGE DEVICES; MATERIALS; MEMORY DEVICES; MICROSCOPY; NANOSTRUCTURES; OXIDES; OXYGEN COMPOUNDS; PARTICLES; PHYSICAL PROPERTIES; SPECTROSCOPY; SURFACE COATING; TRANSITION ELEMENT COMPOUNDS