Morin-like spin canting in the magnetic CaFe{sub 5}O{sub 7} ferrite: A combined neutron and Mössbauer study

Journal Article · Wed Mar 15 04:00:00 EDT 2017 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2016.12.021· OSTI ID:22658215

Delacotte, C.; Bréard, Y.; Caignaert, V.; Hardy, V. ^[1]; Greneche, J. M. ^[2]; Hébert, S. ^[1]; Suard, E. ^[3]; Pelloquin, D. ^[1]

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1. Laboratoire CRISMAT ENSICAEN UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04 (France)
2. Institut des Molécules et Matériaux du Mans, IMMM UMR CNRS 6283, Avenue Olivier Messiaen, 72085 Le Mans (France)
3. Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Grenoble Cedex 9 (France)

Magnetic structure of CaFe{sub 5}O{sub 7} ferrite has been studied jointly from neutron powder diffraction data and spectroscopic Mössbauer measurements in the thermal range from 5 to 500 K. This coupled work highlights three distinct magnetic domains around two specific temperatures: T{sub M}=125 K and T{sub N}=360 K. The latter corroborates the structural monoclinic-orthorhombic transition previously reported by transmission electron microscopy techniques and X-ray thermodiffractometry. Complementary heat capacity measurements have confirmed this first order transition with a sharp peak at 360 K. Interestingly, this large study has revealed a second magnetic transition associated to a spin rotation at 125 K similar to this one reported by Morin in α-Fe{sub 2}O{sub 3} hematite at T{sub M}=260 K. - Graphical abstract: Magnetic structure of CaFe{sub 5}O{sub 7} ferrite has been studied jointly from neutron powder diffraction data and spectroscopic Mössbauer measurements in the thermal range from 5 to 500 K. This coupled work highlights three distinct magnetic domains around two specific temperatures: T{sub M}=125 K and T{sub N}=360 K. Interestingly, this large study has revealed a magnetic transition associated to a spin rotation at 125 K similar to this one reported by Morin in α-Fe{sub 2}O{sub 3} hematite at T{sub M}=260 K.

• OSTI ID: 22658215
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 247; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CALCIUM COMPOUNDS
EXPERIMENTAL DATA
FERRITES
IRON OXIDES
MORIN
NEUTRON DIFFRACTION
SPECIFIC HEAT
TRANSMISSION ELECTRON MICROSCOPY