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Bulk NiFe2O4 is an insulating ferrimagnet. Here, we report on the epitaxialgrowth of spinel NiFe2O4 ultrathin films onto SrTiO3 single-crystals. We willshow that - under appropriate growth conditions - epitaxial stabilization leadsto the formation of a spinel phase with magnetic and electrical properties thatradically differ from those of the bulk material : an enhanced magnetic moment(Ms) - about 250% larger - and a metallic character. A systematic study of thethickness dependence of Ms allows to conclude that its enhanced value is due toan anomalous distribution of the Fe and Ni cations among the A and B sites ofthe spinel structure resulting from the off-equilibrium growth conditions andto interface effects. The relevance of these findings for spinel- and, moregenerally, oxide-based heterostructures is discussed. We will argue that thisnovel material could be an alternative ferromagetic-metallic electrode inmagnetic tunnel junctions.Comment: accepted for publication in Phys. Rev.

physical review. b, condensed matter and materials physics

Enhanced magnetic moment and conductive behavior in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi><mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>spinel ultrathin films

Enhanced magnetic moment and conductive behavior inNiFe2O4spinel ultrathin films