Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/78911
Type: Artigo de periódico
Title: Synthesis, structural and magnetic characterization of highly ordered single crystalline BiFeO3 nanotubes
Author: de Oliveira, LAS
Pirota, KR
Abstract: In this work, we report on the fabrication of highly ordered single crystalline BiFeO3 (BFO) nanotubes by a sol-gel technique using two-step anodic aluminum oxide (AAO) as template. We prepared BFO nanotubes with dimensions of 65 nm in diameter and 3 mu m in length, as confirmed by scanning electron microscopy (SEM) measurements. The obtained single crystalline nanotubes present the expected pure phase (BiFeO3) as confirmed by energy-dispersive X-ray spectroscopy (EDX), selected area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). In addition to the antiferromagnetic behavior, the magnetization curves of the BFO nanotubes also present a ferromagnetic response, which holds from 2 to 300 K. This desirable behavior is associated to the break of the antiferromagnetic helical spin ordering of the BFO nanotubes. Besides the magnetocrystalline anisotropy, the large length-to-diameter ratio induced an uniaxial shape anisotropy, attested by the applied magnetic field angle measurements. (C) 2013 Elsevier Ltd. All rights reserved.
Subject: Nanostructures
Chemical synthesis
Electron microscopy
Magnetic properties
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/j.materresbull.2012.12.066
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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