Negative magnetization, magnetic anisotropy and magnetic ordering studies on Al-substituted copper ferrite |
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Authors: | VK LakhaniBangchuan Zhao Lan WangUN Trivedi KB Modi |
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Affiliation: | a Department of Physics, Saurashtra University, Rajkot 360005, India b School of Physical and Mathematical Sciences, Nanyang Technology University, Singapore 637371, Singapore |
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Abstract: | Detailed magnetic properties of Al3+-modified CuFe2O4 spinel ferrite system: CuAlxFe2−xO4; x = 0.0, 0.2, 0.4 and 0.6, have been studied by means of X-ray powder diffraction, field cooled (FC) and zero field cooled magnetization (ZFC) (H = 10 mTesla, T = 4-325 K), magnetic hysteresis (Hmax = 2 Tesla, T = 10 and 300 K) and low field (40 A/m) ac susceptibility (T = 300-750 K) measurements. The system exhibits canted spin structure. It has been shown that the observed features of the FC-ZFC magnetization and ac susceptibility curves arise due to the low magneto crystalline anisotropy, not due to the cluster spin-glass-like magnetic ordering. The interesting features like low temperature cusp in the ZFC magnetization for all the compositions and negative magnetization for x = 0.6 composition have been observed. An attempt has been made to explain the negative magnetization within the framework of available models. |
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Keywords: | Ferrites Magnetic properties Magnetic anisotropy Magnetic ordering |
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