期刊
NANOTECHNOLOGY
卷 25, 期 35, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/35/355704
关键词
bimagnetic nanoparticles; magnetic anisotropy; interface exchange coupling; cobalt ferrite; nanomagnetism
资金
- ANPCyT Argentina [PICT 2007-0832]
- CONICET Argentina [PIP 2008-1333]
- UNCuyo Argentina [06-C404, 06-C011]
The control of the size of bimagnetic nanoparticles represents an important step toward the study of fundamental properties and the design of new nanostructured magnetic materials. We report the synthesis and the structural and magnetic characterization of bimagnetic CoO/CoFe2O4 core/shell nanoparticles. The material was fabricated by a seed-mediated growth high-temperature decomposition method with sizes in the range of 5-11 nm. We show that the core/shell morphology favours the crystallinity of the shell phase, and the reduction of the particle size leads to a remarkable increase of the magnetic hardening. When the size is reduced, the coercive field at 5 K increases from 21.5 kOe to 30.8 kOe, while the blocking temperature decreases from 388 K to 167 K. The size effects on the magnetic behaviour are described through a phenomenological model for strongly ferri-/antiferromagnetic coupled phases.
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