Exchange Bias Effect in CoO@Fe3O4 Core鈥揝hell Octahedron-Shaped Nanoparticles
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- 作者：Nerio Fonta铆帽a Troiti帽o ; Beatriz Rivas-Murias ; Benito Rodr铆guez-Gonz谩lez ; Ver贸nica Salgueiri帽o
- 刊名：Chemistry of Materials
- 出版年：2014
- 出版时间：October 14, 2014
- 年：2014
- 卷：26
- 期：19
- 页码：5566-5575
- 全文大小：696K
- ISSN：1520-5002
文摘
Increased coercive and tunable exchange bias field values were registered in hybrid CoO@Fe3O4 core鈥搒hell octahedron-shaped nanoparticles of different average size. In this strained morphology, the metal cation chemical potentials at the interface between the antiferromagnetic and ferrimagnetic oxides become a very dynamic variable. This causes the effective magnetic anisotropy to increase and the type of interface to change after growing the magnetite shell epitaxially onto the cobalt oxide {111} surface facets and, consequently, to tune the exchange bias effect.