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Bimagnetic h-Co/h-CoO nanotetrapods: preparation, nanoscale characterization, three-dimensional architecture and their magnetic properties

Deng, X, Yang, D, Tan, G, Li, X, Zhang, J, Liu, Q, Zhang, H, Mellors, NJ, Xue, D and Peng, Y 2014, 'Bimagnetic h-Co/h-CoO nanotetrapods: preparation, nanoscale characterization, three-dimensional architecture and their magnetic properties' , Nanoscale, 6 (22) , pp. 13710-13718.

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Abstract

Well-defined bimagnetic h-Co decorated wurtzite h-CoO nanotetrapods with uniform size have been successfully fabricated by a one-pot thermal decomposition method for the first time, and their three-dimensional architecture, crystal structure, chemical phase and exchange bias effect are characterized at the nanoscale. It is found that individual bimagnetic h-Co/h-CoO nanotetrapods are made of a h-CoO nanotetrapod skeleton to which multiple nanocrystals of ferromagnetic metallic h-Co are directly attached. The chemical analysis shows that the mass ratio of h-CoO and h-Co is 65 : 35. The detailed investigations of the crystal structure reveal that both the h-CoO nanotetrapod skeleton and h-Co nanoparticles have hexagonal structure. The four pods of individual nanotetrapods are single crystals with the same [001] orientation along with their pod axes and grow together by twinning with (110) the twin interface and the 120° spatial boundary angle. The magnetic measurements reveal that the h-Co/h-CoO nanotetrapods have a surprisingly strong room temperature ferromagnetism and there exists a weak exchange coupling between the h-CoO nanotetrapod skeleton and the decorated h-Co tiny nanoparticles. It is believed that our new structural form of the bimagnetic h-Co/h-CoO nanotetrapods provides not only a smart functional 3D nanoarchitecture as building block in nanoelectronics and nanosensors, but also an ideal specimen for a further understanding of weak antiferromagnetic-ferromagnetic interaction.

Item Type: Article
Themes: Energy
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Nanoscale
Publisher: Royal Society of Chemistry
Refereed: Yes
ISSN: 2040-3364
Depositing User: NJ Mellors
Date Deposited: 29 Apr 2015 11:50
Last Modified: 13 Jan 2016 11:33
URI: http://usir.salford.ac.uk/id/eprint/33427

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