Structure and magnetic properties of Cr nanoparticles and Cr2O3 nanoparticles

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	Structure and magnetic properties of Cr nanoparticles and Cr2O3 nanoparticles
	W. S. Zhang; E. Bruck; Z. D. Zhang; O. Tegus; W. F. Li; P. Z. Si; D. Y. Geng; K. H. J. Buschow
	2005
发表期刊	Physica B-Condensed Matter
ISSN	0921-4526
卷号	358 期号:1-4 页码:332-338
摘要	We have synthesized Cr nanoparticles by are-discharge and Cr2O3 nanoparticles by subsequent annealing the as-prepared Cr nanoparticles. The structure of these nanoparticles is studied by means of X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscope. Most of the particles show a good crystal habit of well-defined cubic or orthorhombic shape, while some small particles show spherical shape. The as-prepared Cr nanoparticles have a BCC Cr core coated with a thin Cr2O3 layer. Cr in the core of the particles heated at 873 K for 4 h is changed to Cr2O3. The results of magnetic measurements show that the Cr nanoparticles exhibit mainly antiferromagnetic properties, in addition to a weak-ferromagnetic component at lower fields. The weak-ferromagnetic component may be ascribed to uncompensated surface spins. For the field-cooled Cr2O3 nanoparticles, an exchange bias is observed in the hysteresis loops, which can be interpreted as the exchange coupling between the uncompensated spins at the surface and the spins in the core of the Cr2O3 nanoparticles. (c) 2005 Elsevier B.V. All rights reserved.
部门归属	met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. univ amsterdam, van waals zeeman inst, nl-1018 xe amsterdam, netherlands.;zhang, ws (reprint author), met res inst, shenyang natl lab mat sci, wenhua rd, shenyang 110016, peoples r china;wszhangimr@hotmail.com bruck@science.uva.nl
关键词	Arc-discharge Cr Nanoparticles Weak Ferromagnetism Exchange Bias Nio Nanoparticles Chromium Antiferromagnetism Diffraction Oxidation Anomalies Ferritin Oxide
URL	查看原文
WOS记录号	WOS:000228603800042
引用统计	被引频次：48[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35231
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. S. Zhang,E. Bruck,Z. D. Zhang,et al. Structure and magnetic properties of Cr nanoparticles and Cr2O3 nanoparticles[J]. Physica B-Condensed Matter,2005,358(1-4):332-338.
APA	W. S. Zhang.,E. Bruck.,Z. D. Zhang.,O. Tegus.,W. F. Li.,...&K. H. J. Buschow.(2005).Structure and magnetic properties of Cr nanoparticles and Cr2O3 nanoparticles.Physica B-Condensed Matter,358(1-4),332-338.
MLA	W. S. Zhang,et al."Structure and magnetic properties of Cr nanoparticles and Cr2O3 nanoparticles".Physica B-Condensed Matter 358.1-4(2005):332-338.