Morin-like spin canting in the magnetic CaFe 5 O 7 ferrite: A combined neutron and Mössbauer study - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 2017

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

Résumé

Magnetic structure of CaFe5O7 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: TM=125 K and TN=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-Fe2O3 hematite at TM=260 K.
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hal-02161188 , version 1 (20-06-2019)

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C. Delacotte, Y. Bréard, V. Caignaert, V. Hardy, J.M. Greneche, et al.. Morin-like spin canting in the magnetic CaFe 5 O 7 ferrite: A combined neutron and Mössbauer study. Journal of Solid State Chemistry, 2017, 247, pp.13-19. ⟨10.1016/j.jssc.2016.12.021⟩. ⟨hal-02161188⟩
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