Physics – Condensed Matter – Materials Science
Scientific paper
2005-02-23
Physics
Condensed Matter
Materials Science
accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.71.134419
Bulk NiFe2O4 is an insulating ferrimagnet. Here, we report on the epitaxial growth of spinel NiFe2O4 ultrathin films onto SrTiO3 single-crystals. We will show that - under appropriate growth conditions - epitaxial stabilization leads to the formation of a spinel phase with magnetic and electrical properties that radically differ from those of the bulk material : an enhanced magnetic moment (Ms) - about 250% larger - and a metallic character. A systematic study of the thickness dependence of Ms allows to conclude that its enhanced value is due to an anomalous distribution of the Fe and Ni cations among the A and B sites of the spinel structure resulting from the off-equilibrium growth conditions and to interface effects. The relevance of these findings for spinel- and, more generally, oxide-based heterostructures is discussed. We will argue that this novel material could be an alternative ferromagetic-metallic electrode in magnetic tunnel junctions.
Bertacco Riccardo
Bibes Manuel
Bobo Jean-Francois
Cantoni Matteo
Fontcuberta Josep
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