Novel magnetoelectric composites of cobalt iron alloy and barium titanate

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Full-text: https://www.researchgate.net/publication/312933070_Novel_magnetoelectric_composites_of_cobalt_iron_alloy_and_barium_titanate Abstract: Magnetoelectric barium titanate ceramics with embedded cobalt iron alloy particles (Co1/3Fe2/3)x–(BaTiO3)(1-x), with x=0.2, 0.4, and 0.6, were prepared by a polyolmediated synthesis with subsequent sintering in a reducing forming gas atmosphere. The samples were characterized by XRD and SEM/EDX measurements. The sizes of the Co1/3Fe2/3 grains increase with x. Impedance spectroscopy showed a behavior similar to pure BaTiO3, in particular the occurrence of the ferroelectric-paraelectric phase transition, and high permittivities for the sample with x=0.6, that is, near the percolation threshold. The samples exhibit soft ferromagnetic properties with large saturation magnetizations of 2.5 lB/atom and narrow hystereses. Detailed magnetoelectric investigations revealed a unique DC-field dependence of aME for all three compositions. Most remarkably, the sample with x=0.4 possesses a broad ME hysteresis and an inversion of the sign of aME at 5 kOe.

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Why is it important?

We described and investigated the first BaTiO3-metal alloy magnetoelectric composit material