'Institute of Systematics and Evolution of Animals, Polish Academy of Sciences'
Abstract
We report thin films of ferromagnetic Fe3O4 (magnetite) grown by a reactive magnetron sputtering at T=300÷450°C on lattice-matched MgO, and bilayer structures composed of Fe3O4 and underlying epitaxial films of highly conductive electron-doped In2O3 , LaNiO3 , and antiferromagnetic CoO. The prepared Fe3O4 /MgO films and the bilayer structures demonstrated clearly defined resistance anomaly at Verwey transition point (T V ~100-120K). Formation of high resistance interlayer was indicated between the adjacent conducting Fe3O4 and LaNiO 3 layers. However, relatively low interface resistivity of about 0.1Ωcm 2 (at T=300K) was estimated for the patterned Fe3O4 /In2O3 bilayer structures. Vertical electrical transport measurements revealed strong nonlinearity in the I-U dependences of the Fe3O4 /In2O3 interface at T<T V
