Multiferroic Cobalt Ferrite-Lead Iron Tungstate Composites

• Authors: J. Kulawik , D. Szwagierczak , P. Guzdek
• Languages of publication: EN

Abstracts

EN

The paper presents dielectric, magnetic and magnetoelectric properties of multiferroic bulk composites based on CoFe_2O_4 ferrite and Pb(Fe_{2/3}W_{1/3})O_3 relaxor. X-ray diffraction analysis and scanning electron microscopy observations of ceramic samples revealed two-phase composition and fine grained microstructure with uniformly distributed ferromagnetic and ferroelectric phases. Dielectric permittivity measured in a temperature range 218-773 K at frequencies of 10 Hz-2 MHz exhibits high and broad maxima attributed to dielectric relaxation. The hysteresis determined in a temperature range 4-393 K for magnetic field changing from - 80 kOe to 80 kOe is typical of hard magnetic materials. Saturation magnetizations and coercivities were found to decrease with increasing temperature. The courses of zero field cooled and field cooled magnetization versus temperature curves measured in the temperature range 4-393 K imply spin glass behavior of the ferrite and antiferromagnetic transition of the relaxor at low temperatures. The ferrite-relaxor composite shows high magnetoelectric voltage coefficient which distinctly increases with increasing frequency of ac magnetic field and is slightly higher for higher ac and dc magnetic fields.

Keywords

EN

75.50.-y; 75.60.Ej; 75.85.+t; 77.22.Ch

Discipline

• 75.85.+t: Magnetoelectric effects, multiferroics(for multiferroics and magnetoelectric films, see 77.55.Nv)
• 75.50.-y: Studies of specific magnetic materials
• 77.22.Ch: Permittivity (dielectric function)(for low-permittivity dielectric films, see 77.55.Bh; for high-permittivity gate dielectric films, 77.55.D-)
• 75.60.Ej: Magnetization curves, hysteresis, Barkhausen and related effects(for hysteresis in ferroelectricity, see 77.80.Dj)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 1
• Pages: 122-124

Dates

published

2012-01

Contributors

author

J. Kulawik

• Institute of Electron Technology, Kraków Division, Zabłocie 39, 30-701 Kraków, Poland

author

D. Szwagierczak

• Institute of Electron Technology, Kraków Division, Zabłocie 39, 30-701 Kraków, Poland

author

P. Guzdek

• Institute of Electron Technology, Kraków Division, Zabłocie 39, 30-701 Kraków, Poland

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Identifiers

DOI

10.12693/APhysPolA.121.122