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Effect of low amount Mn doping on structural and magnetic properties of SrFe12O19: Effective magnetic anisotropy study by Stoner - Wohlfarth model

Abstract : A series of strontium hexaferrites (Sr-HF) compounds, doped with a low amount of manganese SrFe12-xMnxO19 (where x = 0.00, 0.03 and 0.05), were prepared by a sol-gel method. Structural and microstructural characterizations were performed by X-ray diffraction (XRD) and scanning electronic microscopy (SEM) in order to determine some basic properties such as lattice parameters and particles size. Moreover, magnetic properties of the samples were measured in a temperature range from 2 to 900 K. The results show that the transition temperature (TC) decreases from 764 to 721 K with Mn doping at x = 0.05 content. Also, temperature and doping effects on the coercivity (Hc), the remanent magnetization (Mr) and the magnetization of saturation (MS) were discussed considering the Stoner - Wohlfarth model. A slight improvement of the magnetic properties (Hc =5.56 kOe, Mr =49.99 emu/g, MS =101.9 emu/g (i.e. 19.37 µB/u.f)) for low content (x = 0.03) is evidenced, yielding to promising material for permanent magnet devices. This improvement was explained by the relationship between the microstructure and to the effective magnetic anisotropy.
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https://hal.univ-lille.fr/hal-03179667
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Soumis le : mercredi 24 mars 2021 - 12:46:34
Dernière modification le : mardi 19 octobre 2021 - 11:49:57

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L.H. Omari, A. Lekdadri, H. Lassri, Olivier Mentre, C. Minaud, et al.. Effect of low amount Mn doping on structural and magnetic properties of SrFe12O19: Effective magnetic anisotropy study by Stoner - Wohlfarth model. Materials Today Communications, Elsevier, 2021, Materials Today Communications, pp.102257. ⟨10.1016/j.mtcomm.2021.102257⟩. ⟨hal-03179667⟩

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