Table of Contents
Journal of Materials
Volume 2015, Article ID 834267, 8 pages
http://dx.doi.org/10.1155/2015/834267
Research Article

Structural Characteristics and Magnetic Properties of Al2O3 Matrix-Based Co-Cermet Nanogranular Films

1International Training Institute for Material Science, Hanoi University of Science and Technology, Hanoi 10000, Vietnam
2Department of Basic Sciences, Hung Yen University of Technology and Education, Hung Yen 39000, Vietnam
3Hanoi Community College, Trung Kinh, Cau Giay, Hanoi 10000, Vietnam
4Institute for Engineering Physics, Hanoi University of Science and Technology, Hanoi 10000, Vietnam

Received 6 June 2015; Revised 19 October 2015; Accepted 20 October 2015

Academic Editor: Tung-Ming Pan

Copyright © 2015 Giap Van Cuong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Magnetic micro- and nanogranular materials prepared by different methods have been used widely in studies of magnetooptical response. However, among them there seems to be nothing about magnetic nanogranular thin films prepared by a cosputtering technique for both metals and insulators till now. This paper presented and discussed preparation, structural characteristics, and magnetic properties of alumina () matrix-based granular Co-cermet thin films deposited by means of the cosputtering technique for both Co and . By varying the ferromagnetic (Co) atomic fraction, , from 0.04 to 0.63, several dominant features of deposition for these thin films were shown. Structural characteristics by X-ray diffraction confirmed a cermet-type structure for these films. Furthermore, magnetic behaviours presented a transition from paramagnetic- to superparamagnetic- and then to ferromagnetic-like properties, indicating agglomeration and growth following Co components of Co clusters or nanoparticles. These results show a typical granular Co-cermet feature for the Co- thin films prepared, in which Co magnetic nanogranules are dispersed in a ceramic matrix. Such nanomaterials can be applied suitably for our investigations in future on the magnetooptical responses of spinplasmonics.