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ILEEMS of thin α-Fe2O3 films prepared by RF sputtering

Van Cromphaut, Caroline and De Resende, Valdirene Gonzaga and De Grave, Eddy and Presmanes, Lionel and Pasquet, Isabelle and Tailhades, Philippe ILEEMS of thin α-Fe2O3 films prepared by RF sputtering. (2009) Hyperfine interactions , 189 (1-3). 175-181. ISSN 0304-3843

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Official URL: http://dx.doi.org/10.1007/s10751-009-9913-z

Abstract

Thin α-Fe2O3 films on semi-quartz substrates have been prepared by radio frequency (RF) sputtering of a magnetite target in a pure argon gas flow with a bias power applied. The films were studied by X-ray diffraction and Integral Low-Energy Electron Mössbauer Spectroscopy (ILEEMS), the latter in the temperature range of 80 to 330 K. In ILEEMS electrons of ∼10 eV are detected and therefore it is an ideal instrument to study thin films with thicknesses below 500 nm. The first ILEEMS measurements on α-Fe2O3 films are reported and focus on the behaviour of the Morin transition, i.e., the reorientation of Fe3+ spins from the [111] crystallographic direction at low temperature, to the (111) basal plane at high temperature. Some films (∼400 nm) show the presence of both a weak- and antiferromagnetic hematite phase for all temperatures between 140 and 330 K. Others of about ∼100 nm thick only have a weak ferromagnetic phase for temperatures between 140 and 330 K of which the hyperfine field distribution shows two maxima, related to two distinct phases. Both phases stay in some films almost equal in intensity in the spectrum for the whole measured temperature range. In others a significant evolution in the spectral areas of both weak ferromagnetic phases as function of the temperature is observed.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at http://link.springer.com The original PDF of the article can be found at Hyperfine interactions website: http://link.springer.com/article/10.1007%2Fs10751-009-9913-z
HAL Id:hal-00860755
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universiteit Gent - UGENT (BELGIUM)
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Deposited By: cirimat webmestre
Deposited On:11 Sep 2013 06:25

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