Investigation of Magnetic Interactions in Core/Shell Structured SrFe12O19/NiZnFe2O4 Nanocomposite

被引：17
|
作者：
Radmanesh, M. A. [1 ]
Ebrahimi, S. A. Seyyed [1 ]
Yourdkhani, A. [1 ]
Khanmohammadi, H. [1 ]
机构：
[1] Univ Tehran, Ctr Excellence Magnet Mat, Sch Met & Mat, Tehran, Iran
来源：
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2012年 / 25卷 / 08期
关键词：
Surface modification; Core-shell; Exchange spring; Bi-magnetic; Nanocomposites; CORE-SHELL STRUCTURE; PERMANENT-MAGNETS; SILICA MATRIX; NANOPARTICLES;
D O I：
10.1007/s10948-011-1258-6
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
SrFe12O19 magnetic nanoparticles (MNPs) were synthesized by a sol-gel self-propagating method and subsequent heat treatment. The SrFe12O19/NiZnFe2O4 core/shell MNPs were obtained by coating the SrFe12O19 MNPs by glyoxilate precursor method using metallic nitrates and ethylene glycol. The core/shell was characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM) techniques. Comparison of the observations with theoretical criteria indicated that the demagnetization behavior of composite NPs is in exchange spring mode. This phenomenon is attributed to the overcritical size, 46 nm, of the hard phase, which leads to partial exchange coupling between hard- and soft-magnetic phases.
引用
收藏
页码：2757 / 2762
页数：6
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