Room Temperature Ferromagnetic V-Doped MgO Nanoparticles
MgO is a widely used material in ceramic and electronic industry. It is a well known insulator which has been used as a spacer layer in electronic circuits and magnetic tunnel junctions. We report room temperature ferromagnetism in undoped, and V doped MgO nanoparticles of the same
size (∼ 39 nm diameter) produced by a two-step chemical process, but containing nominal 0.5, 0.7, 0.9, 1, 1.1, and 1.5 at.% V. Strikingly, the saturation magnetization shows an anomalous abrupt increase in its value to 80.2 memu/g for the 1 at% V doped nanoparticles. Also, high resolution
TEM studies show that on doping with V the lattice parameters, d111 in particular, increases from 2.42 Å [MgO] to 2.47 Å in the case of [MgO:V(1%)]. These results are consistent with recent theoretical predictions on a first principles basis which suggests that the observed
ferromagnetism is sensitively dependent on the distance between the V
Mg – V
Mg. Vacancies.
Keywords: D 0 MAGNETISM; DOPING; MAGNETIC; MGO; NANOPARTICLES; OXIDES
Document Type: Research Article
Publication date: 01 September 2012
- Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
- Editorial Board
- Information for Authors
- Subscribe to this Title
- Ingenta Connect is not responsible for the content or availability of external websites
- Access Key
- Free content
- Partial Free content
- New content
- Open access content
- Partial Open access content
- Subscribed content
- Partial Subscribed content
- Free trial content