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Physical investigations on perovskite LaMnO 3-d sprayed thin ? lms forspintronic applications

Auteurs : A. Boukhachem, A. Ziouche, M.Ben Amor, O. Kamoun, M. Zergoug, H. Maghraoui-Meherzi, A. Yumak, K. Boubaker, M. Amlouk
Année : 2015
Domaine : Physique
Type : Publication
Revue : Materials Research Bulletin
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : Thin ?lms, Magnetic Properties, Raman spectroscopy, Impedance spectroscopy, X- ray diffraction, Dielectric properties

Résumé :

Oxygen de ?cient LaMnO 3 thin ?lms were successfully grown on glass substrate by spray pyrolysis at460  C. XRD studies show oxygen vacancies corresponding to the orthorhombic La4 Mn4O 11 with (0 40)preferential orientation. Optical properties were investigated through optical band gap and Urbachenergy. The dispersion of the refractive index wa s discussed in terms of both Cauchy and Wemple & Di-domenico models. Raman spectroscopy shows the band positions corresponding to LaMnO3 with a shif trelated to oxygen de?ciency. Electrical properties were quanti ?ed using impedance spectroscopytechnique within frequency range of 5 Hz –13 MHz at various temperatures. Both the DC conductivity andrelaxation frequency were thermally activated with activation energy around 0.9 eV. Also, ACconductivity wa s investigated through Jonscher law. Finally, magnetic measurements at roomtemperature using vibrating sample magnetometer (VSM) technique show ferromagnetic behavior ofthese ternary sprayed thin ?lms.