2024-03-29T04:26:35Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1822792020-12-11T08:56:26Zcom_10261_78com_10261_3com_10261_34com_10261_5com_10261_135com_10261_4col_10261_331col_10261_287col_10261_388
2019-05-24T09:59:28Z
urn:hdl:10261/182279
Bulk and surface characterisation of micrometer-thick cobalt ferrite films grown by IR PLD
Sánchez-Arenillas, M.
Oujja, M.
Moutinho, Fernando
de la Figuera, Juan
Cañamares, María Vega
Quesada, Adrián
Castillejo, Marta
Marco, J.F.
AMPHIBIAN Project ID:720853
European Commission
Ministerio de Economía y Competitividad (España)
Cobalt ferrite
Raman spectroscopy
Mössbauer spectroscopy
Pulsed laser deposition
We have studied micrometer-thick cobalt ferrite films deposited on Si (1 0 0) single crystal substrates by nanosecond pulsed laser deposition at 1064 nm.The thickness of the deposited films (1.3 μm) was monitored by AFM. The chemical and structural characterisation of the films was carried out by Raman spectroscopy and transmission Mössbauer spectroscopy at 300 and 26 K. For comparison purposes, transmission Mössbauer data at these two temperatures were also recorded from a commercial cobalt ferrite powder and the home-made target used to grow the films. The surface characterisation was performed by X-ray Photoelectron Spectroscopy (XPS) and Integral Low Energy Electron Spectroscopy (ILEEMS). XPS showed Co and Fe to be present as Co and Fe, as expected for cobalt ferrite. The Raman spectra showed the lines characteristic of cobalt ferrite. The Mössbauer spectra, both in the transmission and backscattering modes, were fitted to two sextets whose hyperfine parameters are in good agreement with those expected from Fe cations occupying the tetrahedral and octahedral sites in the spinel-related structure. No significant differences were observed in the relative areas of the two sextets in the transmission and ILEEMS spectra, suggesting that the cation distribution at the surface and the bulk are not too different. However, the relative areas of the two components changed drastically with temperature both in the spectra of the films as in those recorded from the cobalt ferrite standards. We discuss the possible origin of the evolution with temperature of those relative areas.
2019-05-24T09:59:28Z
2019-05-24T09:59:28Z
2019
2019-05-24T09:59:29Z
artículo
Applied Surface Science 470: 917- 922 (2019)
http://hdl.handle.net/10261/182279
10.1016/j.apsusc.2018.11.152
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100000780
eng
Postprint
https://doi.org/10.1016/j.apsusc.2018.11.152
Sí
info:eu-repo/grantAgreement/EC/H2020/720853
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTQ2016-75880-P
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2015-64110-C2
© 2018 Elsevier B.V.
openAccess
Elsevier