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Type: Artigo de periódico
Title: Magnetic And Structural Investigations On La0.6sr 0.4mno3 Nanostructured Manganite: Evidence Of A Ferrimagnetic Shell
Author: Andrade V.M.
Caraballo-Vivas R.J.
Costas-Soares T.
Pedro S.S.
Rocco D.L.
Reis M.S.
Campos A.P.C.
Coelho A.A.
Abstract: This paper presents the structural and magnetic properties of La 0.6Sr0.4MnO3 nanoparticles with sizes from 21 to 106 nm, which have been prepared using the sol-gel method. The reduction of the nanoparticles' size tends to broaden the paramagnetic to ferromagnetic transition, as well as to promote magnetic hysteresis and a remarkable change on the magnetic saturation. In order to better understand the magnetic behavior of those nanoparticles, a simple model based on a ferromagnetic core and a ferrimagnetic shell was considered, where the magnetization was described in terms of the standard mean-field Brillouin function. This model matches the experimental data, leading to conclusion the nanoparticles with size <40nm are single magnetic domain. In addition, the output fitting parameters give information on the Landé factor of the core and shell. © 2014 Elsevier Inc.
Editor: Academic Press Inc.
Rights: fechado
Identifier DOI: 10.1016/j.jssc.2014.07.013
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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