Publications (2)3.84 Total impact
Article: Reduced leakage currents and possible charge carriers tuning in Mg-doped Ga0.6Fe1.4O3 thin films[show abstract] [hide abstract]
ABSTRACT: Ga0.6Fe1.4O3 is predicted to be magnetoelectric with non zero magnetization at room temperature. However, in thin films, electric properties are overshadowed by strong leakage currents. In this Letter, we show that Mg doping in Ga0.6Fe1.4O3 thin films grown by pulsed laser deposition allows decreasing the leakage current density by four orders of magnitude and might simultaneously allow tuning the carriers’ nature. These results suggest the possibility to develop a new class of material exhibiting room temperature magnetization, tunable transport properties, and magnetoelectric properties.Applied Physics Letters 06/2012; 100(111):7-720. · 3.84 Impact Factor
[show abstract] [hide abstract]
ABSTRACT: Substitution of Fe for Sc in CoFe2O4 spinel structure is presented. All CoFe2−xScxO4 compounds crystallize in the spinel type structure (space group Fd3̄m). By using X-ray diffraction studies, magnetic measurements and in-field 57Fe Mössbauer spectrometry, the limit of substitution has been determined to be equal to x=0.56. An increase in the cell parameter and the strains and a decrease in the apparent crystallites size are observed. For x>0.3, a partial oxidation of cobalt is evidenced and Co3+ is stabilized in the structure. A ferromagnetic behavior has been observed for all investigated compounds. As x increases, the Curie temperature and the hyperfine fields decrease. Following the Stephenson model, the diminution of TC is ascribed to a decrease of the main JAB interaction.Graphical abstractEvolution of the cell parameters, the magnetic properties and the Mössbauer spectra in CoFe2−rScrO4 (0≤r≤1).Journal of Solid State Chemistry. 183(11):2623-2630.