Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16745
Title: Magnetic properties of Dy nanoparticles and Al2O3-coated Dy nanocapsules
Authors: Liu, XG
Or, SW 
Li, B
Ou, ZQ
Zhang, L
Zhang, Q
Geng, DY
Yang, F
Li, D
Bruck, E
Zhang, ZD
Keywords: Nanoparticles
Magnetic properties
Size effect
Rare-earth metals
Issue Date: 2011
Publisher: Springer
Source: Journal of nanoparticle research, 2011, v. 13, no. 3, p. 1163-1174 How to cite?
Journal: Journal of Nanoparticle Research 
Abstract: Dy2O3-coated Dy nanoparticles and Al2O3-coated Dy nanocapsules, with Dy cores with the average size of 3.6 and 17.6 nm, respectively, are synthesized by arc-discharge technique. The transition from ferromagnetism to antiferromagnetism absents in the Dy nanoparticles, due to that its average core size of 3.6 nm is smaller than the helix period of Dy. The temperature of the superparamagnetism-antiferromagnetism transition in the Dy nanocapsules increases abnormally to 105 K, while the N,el temperature decreases to 150 K. The magnetic-entropy change (-a dagger S (m)) of the Dy nanoparticles rapidly increases with decreasing temperature. For Al2O3-coated Dy nanocapsules, -a dagger S (m) reaches 15.2 J kg(-1) K-1 at 7.5 K, due to the existence of superparamagnetism, and a peak (5.2 J kg(-1) K-1) appears at 105 K due to the superparamgantism-antiferromagnetism transition, and -a dagger S (m) exceeds 2 J kg(-1) K-1 in the temperature range from 7.5 to 105 K, for a field change from 1 to 5 T.
URI: http://hdl.handle.net/10397/16745
ISSN: 1388-0764
DOI: 10.1007/s11051-010-0108-y
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