Assessment of the critical behavior near the FM to PM phase transition in cubic Ni0.3-xCuxZn0.7Fe2O4 spinel ferrite

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:503

Article

Felhi, R.¹  Riahi, K.^1,2  Omrani, H.¹  Koubaa, M.³  Koubaa, W. Cheikhrouhou¹  Cheikhrouhou, A.¹ 

[1] Ctr Rech Numer Sfax, LT2S, Route Tunis,Km 9,BP 275, Sfax 3021, Tunisia

[2] Univ Twente, Magnet Detect & Imaging Grp MD&I, Enschede, Netherlands

[3] Univ Sfax, Inst Super Biotechnol Sfax, BP 261, Sfax 3000, Tunisia

关键词: Zn-Ni-Cu ferrites;    Crystal structure;    Morphology;    Critical behavior;   

DOI  :  10.1016/j.jmmm.2020.166531

来源: Elsevier

【 摘 要 】

In this study, we report a thorough examination of the critical behavior of the cubic Ni0.3-xCuxZn0.7Fe2O4 (x = 0.0, 0.1 and 0.2) spinel ferrite which are crystallized with different irregular shapes of particle size (spherical,polygonal and cubic). The magnetic transition is ferromagnetic to paramagnetic state for all Cu-doped compounds. Different theoretical analyses, as the modified Arrott plot, Kouvel-Fisher method, and critical isotherm, have been used to identify the values of the ferromagnetic transition temperature T-C, and the critical exponents of beta, gamma and delta. All the obtained values of critical parameters were found to be close to the 3D-Heisenberg theoretical model, which implies short-range magnetic interactions in Cu-doped compounds. The reliability of critical parameters was further checked through different methods, such as the Widom scaling relationship and the magnetic equation.

【 授权许可】

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