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Magnetization enhancement in nanosized MgFe2O4 prepared by mechanosynthesis

被引：70
作者：
Sepelak, V.
Bergmann, I.
Menzel, D.
Feldhoff, A.
Heitjans, P.
Litterst, F. J.
Becker, K. D.
机构：
[1] Braunschweig Univ Technol, Inst Phys & Theoret Chem, D-38106 Braunschweig, Germany
[2] Slovak Acad Sci, Inst Geotechn, SK-04533 Kosice, Slovakia
[3] Braunschweig Univ Technol, Inst Condensed Matter Phys, D-38106 Braunschweig, Germany
[4] Leibniz Univ Hannover, Inst Phys Chem & Electrochem, D-30167 Hannover, Germany
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 316卷 / 02期
关键词：
ferrimagnet; fine particle; cation disorder; spin canting; mechanosynthesis;
D O I：
10.1016/j.jmmm.2007.03.087
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The magnetization enhancement in nanoscale mechanosynthesized MgFe2O4 is reported and is discussed in terms of a modified core-shell model, in which a competition between the effects of spin canting and site exchange of cations plays a decisive role. Because of the nearly random distribution of cations, the surface shell of nanoparticles exhibits an effective magnetic moment that is about 2 times larger than that of the particle core. The thickness of the "magnetically active'' surface shell is calculated from the size-dependent magnetization measurements. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：E764 / E767
页数：4
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