IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Evidence of defect-induced ferromagnetism in ZnFe2O4 thin films
Autor/es:
RODRIGUEZ TORRES CLAUDIA; GOLMAR F.; ZIESE, MIQUEL; ESQUINAZI, P.; PÉREZ DE HELUANI SILVIA
Revista:
PHYSICAL REVIEW B
Editorial:
AMER PHYSICAL SOC
Referencias:
Año: 2011 vol. 84 p. 64404 - 64409
ISSN:
1098-0121
Resumen:
X-ray absorption near-edge and grazing incidence x-ray fluorescence spectroscopy are employed to investigate the electronic structure of ZnFe2O4 thin films. The spectroscopy techniques are used to determine the nonequilibrium cation site occupancy as a function of depth and oxygen pressure during deposition and its effects on the magnetic properties. It is found that low deposition pressures below 10−3 mbar cause iron superoccupation of tetrahedral sites without Zn2+ inversion, resulting in an ordered magnetic phase with high room-temperature magnetic moment.