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A temperature and magnetic field dependence Mossbauer study of ɛ-Fe2O3

Rehspringer, Jean Luc and Vilminot, Serge and Niznansky, Daniel and Zaveta, K. and Estournès, Claude and Kurmoo, Mohamedally A temperature and magnetic field dependence Mossbauer study of ɛ-Fe2O3. (2005) Hyperfine interactions , vol. 1 (n° 1-4). pp. 475-481. ISSN 0304-3843

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Official URL: http://dx.doi.org/10.1007/s10751-006-9311-8

Abstract

ɛ-Fe2O3 was synthesized as nanoparticles by a pre-vacuum heat treatment of yttrium iron garnet (Y3Fe5O12) in a silica matrix at 300-C followed by sintering in air at 1,000-C for up to 10 h. It displays complex magnetic properties that are characterized by two transitions, one at 480 K from a paramagnet (P) to canted antiferromagnet (CAF1) and the second at ca. 120 K from the canted antiferromagnet (CAF1) to another canted antiferromagnet (CAF2). CAF2 has a smaller resultant magnetic moment (i.e. smaller canting angle) than CAF1. Analysis of the zero-field Mossbauer spectra at different temperatures shows an associated discontinuity of the hyperfine field around 120 K. In an applied field, the different magnetic sublattices were identified and the directions of their moments were assigned. The moments of the two sublattices are antiparallel and collinear at 160 K but are at right angle to each other at 4.2 K.

Item Type:Article
Additional Information:Thanks to SpringerLink editor. The original publication is available at www.springerlink.com.
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Charles University (CEZCH REPUBLIC)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université Louis Pasteur-Strasbourg I - ULP (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By: Thomas Bonnecarere

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