INVESTIGADORES
GOLMAR Federico
artículos
Título:
Evidence of defect-induced ferromagnetism in ZnFe2O4 thin films
Autor/es:
C. E. RODRÍGUEZ TORRES; F. GOLMAR; M. ZIESE; P. ESQUINAZI; S. P. HELUANI
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Editorial:
American Physical Society
Referencias:
Año: 2011 vol. 84 p. 64404 - 64404
ISSN:
0163-1829
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.
