Room Temperature Ferromagnetic V-Doped MgO Nanoparticles
2012 (English)In: Materials Express, ISSN 2158-5849, Vol. 2, no 3, 233-237 p.Article in journal (Refereed) Published
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 (similar to 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, d(111) in particular, increases from 2.42 angstrom [MgO] to 2.47 angstrom 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.
Place, publisher, year, edition, pages
2012. Vol. 2, no 3, 233-237 p.
Oxides, MgO, Doping, Magnetic Nanoparticles, d(0) Magnetism
IdentifiersURN: urn:nbn:se:kth:diva-94885DOI: 10.1166/mex.2012.1076ISI: 000311914200005ScopusID: 2-s2.0-84871549918OAI: oai:DiVA.org:kth-94885DiVA: diva2:526318
FunderVinnovaSwedish Research CouncilKnut and Alice Wallenberg Foundation
QC 20130108. Updated from accepted to published.2012-05-112012-05-112013-01-08Bibliographically approved