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Structure and magnetic properties of Cr nanoparticles and Cr2O3 nanoparticles
- Source :
- Physica B-Condensed Matter, 358(1-4), 332-338. Elsevier
- Publication Year :
- 2005
- Publisher :
- Elsevier, 2005.
-
Abstract
- 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.
- Subjects :
- Materials science
Condensed matter physics
Annealing (metallurgy)
Analytical chemistry
Nanoparticle
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Exchange bias
X-ray photoelectron spectroscopy
Transmission electron microscopy
Antiferromagnetism
Orthorhombic crystal system
Electrical and Electronic Engineering
Crystal habit
Subjects
Details
- ISSN :
- 18732135 and 09214526
- Volume :
- 358
- Issue :
- 1-4
- Database :
- OpenAIRE
- Journal :
- Physica B-Condensed Matter
- Accession number :
- edsair.doi.dedup.....fa39610f1a669362ce23add1ab306b34