High temperature magnetic properties of Co1-xMgxFe2O4 nanoparticles prepared by forced hydrolysis method

被引：43

作者：

Franco, A., Jr. ^{[1
]}

Silva, F. C. e ^{[1
,2
]}

Zapf, Vivien S. ^{[3
]}

机构：

[1] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go, Brazil

[2] Univ Fed Goias, Inst Quim, BR-74001970 Goiania, Go, Brazil

[3] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 07期

关键词：

NANOCRYSTALS;

D O I：

10.1063/1.3677923

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this work, we study the effect of Mg2+ nonmagnetic ions on the magnetic properties of cubic Co1-xMgxFe2O4 mixed nanostructured ferrites synthesized by a forced hydrolysis method. Magnetization measurements show that all specimens are superparamagnetic at room temperature, and the saturation magnetization (M-s) decreases with increasing the molar magnesium concentration, being 260 emu/cm(3) and 160 emu/cm(3) for x = 0.0 and 0.6, respectively. The Curie temperature T-C, similar to 740 K is determined by means of the inverse of the susceptibility versus temperature and slightly depends on the Mg content. The effective anisotropy constant, (K-eff) decreases with substitution of Co2+ ion by nonmagnetic Mg2+ ions in the spinel structure. These results are discussed in terms of interparticle interactions induced by the thermal fluctuations, cation distribution and other imperfections that could increase with temperature. (C) 2012 American Institute of Physics. [doi:10.1063/1.3677923]

引用

页数：3