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Magnetic and ferroelectric domain structures in BaTiO3-(Ni0.5Zn0.5)Fe2O4 multiferroic ceramics (Articolo in rivista)

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Magnetic and ferroelectric domain structures in BaTiO3-(Ni0.5Zn0.5)Fe2O4 multiferroic ceramics (Articolo in rivista) (literal)

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Alternative label

Catalin Harnagea; Liliana Mitoseriu; Vincenzo Buscaglia; Ilaria Pallecchi; Paolo Nanni (2007)
Magnetic and ferroelectric domain structures in BaTiO3-(Ni0.5Zn0.5)Fe2O4 multiferroic ceramics
in Journal of the European Ceramic Society; Elsevier Science Ltd., Oxford (Regno Unito)
(literal)

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Catalin Harnagea; Liliana Mitoseriu; Vincenzo Buscaglia; Ilaria Pallecchi; Paolo Nanni (literal)

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Rivista

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In: Journal of the European Ceramic Society, vol. 27 (13-15) pp. 3947 - 3950. Electroceramics X : Tenth International Conference on Electroceramics (Toledo, Spain, 18-22 June 2006). Elsevier, 2007. (literal)

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INRS-EMT, University Québec, 1650 Lionel-Boulet, Varennes, Que. J3X 1S2, Canada; Department of Solid State & Theor. Physics, Al. I. Cuza University, Bv. Carol I, 11, Iasi 700506, Romania; Department of Chemical & Process Eng., University Genoa, P-le Kennedy 1, Genoa I-16129, Italy Institute for Energetics & Interphases-CNR, Via de Marini 6, Genoa I-16149, Italy; Physics Department & INFM, University of Genoa, Via Dodecaneso 33, Genoa I-16146, Italy (literal)

Titolo

Magnetic and ferroelectric domain structures in BaTiO3-(Ni0.5Zn0.5)Fe2O4 multiferroic ceramics (literal)

Abstract

BaTiO3-(Ni0.5Zn0.5)Fe2O4 composites prepared by co-precipitation were investigated. The macroscopic magnetic properties derived from the magnetic phase (low coercivity, almost no M(H) hysteretic behavior and high permeability) are preserved in the composite. The dielectric properties are strongly influenced by interface phenomena (Maxwell-Wagner), due to the local electrical inhomogeneity. At low frequencies, the composites present thermally activated conductivity and relaxation, while at 1MHz permittivity of around 500 and tan delta < 8% is obtained at room temperature. The multiferroic character was demonstrated at nanoscale by the presence of the magnetic and ferroelectric domain structure in the same region. Imprint polarisation in the regions corresponding to the ferroelectric phase is found, as result of an internal electrical field created at the interfaces between the (Ni,Zn)-ferrite and BaTiO3 regions. (literal)

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