Magnetic phase transition and magneto-dielectric analysis of spinel chromites: MCr 2 O 4 (M = Fe, Co and Ni)
Source abstract
Abstract
Abstract In this work, we present magnetic phase transition temperatures and magneto-dielectric coupling in MCr 2 O 4 (M = Fe, Co and Ni) ceramics, synthesized using sol–gel auto-combustion route. In order to develop their respective crystalline textures, all these chromites were calcined at 650 °C for 2 h. X-ray diffraction patterns confirmed that FeCr 2 O 4 had a rhombohedral structure while NiCr 2 O 4 and CoCr 2 O 4 exhibited a spinel-type cubic structure. The presence of relevant elements in the specific stoichiometric ratios was confirmed using energy dispersive X-ray spectroscopy. The shapes and sizes of the grains for all the samples were determined using the images obtained from a field emission scanning electron microscope. Temperature dependent magnetic analysis have shown that FeCr 2 O 4 , CoCr 2 O 4 and NiCr 2 O 4 are ferromagnetic at 5 K and their magnetic phase transition temperatures were measured as 80, 83 and 90 K, respectively. Spin-orbit interference was also studied through magneto-dielectric coupling for these chromites using a modified impedance analyzer set-up.
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Research context
OpenAlex topics: Magnetic Properties and Synthesis of Ferrites · Multiferroics and related materials · Advanced Condensed Matter Physics
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References (37)
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