Effect of domain transformation on the magnetic properties of CuxNi1−xFe2O4 ferrites期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Effect of domain transformation on the magnetic properties of Cu_xNi₁₋_xFe₂O₄ ferrites

Authors:	Justice Msomi Thomas Moyo

Affiliation:	^a Department of Physics, Qwaqwa Campus, University of the Free State, Phuthaditjhaba 9866, South Africa ^b School of Physics, Westville Campus, University of KwaZulu-Natal, Durban 4000, South Africa

Abstract:	We report the effect of crossover from multi- to single-domain particles on the magnetic properties of Cu_xNi₁₋_xFe₂O₄ (x=0 and 0.5) oxides due to grain size reduction to nanometer scale. The Mössbauer spectra for milled nanosized powder show a combination of ordered and super-paramagnetic behavior. The coercive field (H_C) is found to increase with reduction in grain size (G) according to the equation H_C=a_m+b_m/G for multi-domain particles. For single-domain particles H_C decreases with G according to H_C=a_s−b_s/G².

Keywords:	Mixed ferrites Nanoparticles Mö ssbauer spectra Magnetizations Coercivity
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