Magnetoelectric Properties in Nickel Ferrite – Niobate Relaxor Bulk Composites

Abstract:

Magnetoelectric effect in multiferroic materials is widely studied for its fundamental interest and practical applications. The magnetoelectric effect observed for single phase materials like Cr₂O₃, BiFeO₃, Pb(Fe_0.5Nb_0.5)O₃ is usually small. A much larger effect can be obtained in composites consisting of magnetostrictive and piezoelectric phases. This paper investigates the magnetostrictive and magnetoelectric properties of nickel ferrite Ni_0.3Zn_0.62Cu_0.08Fe₂O₄ - relaxor Pb(Fe_0.5Nb_0.5)O₃ bulk composites. The magnetic properties of composites shows a dependence typical of such composite materials, i.e. it consists of a dominating signal from ferrimagnetic phase (ferrite) and a weak signal from paramagnetic (antiferromagnetic) phase (relaxors). Magnetoelectric effect at room temperature was investigated as a function of static magnetic field (300-7200 Oe) and frequency (10 Hz-10 kHz) of sinusoidal modulation magnetic field. The magnetoelectric effect increase slightly before reaching a maximum at H_DC = 750 Oe and then decrease. The magnetoelectric coefficient increases continuously as frequency is raised, although this increase is less pronounced in the 1-10 kHz range.

• Periodical: Advances in Science and Technology (Volume 77)
• Pages: 215-219
• DOI: https://doi.org/10.4028/www.scientific.net/AST.77.215
• Online since: September 2012
• Authors: Piotr Guzdek
• Keywords: Dielectric Property, Magnetic Hysteresis, Magnetoelectric Composite, Magnetoelectric Effect, Multiferroic Materials

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