The physics of magnetoelectric composites

Größinger, R.; Duong, Giap V.; Sato-Turtelli, Reiko

doi:10.1016/j.jmmm.2008.02.031

Cited by 98 publications

(47 citation statements)

References 24 publications

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“…The ME effect in multiferroic materials arises due to the interaction of the magnetic and ferroelectric domains [30]. The ME coefficient (α ME ) has been determined by dynamic method [31] with simultaneous application of ac as well as dc magnetic field. The variation of α ME with applied dc magnetic field for all compositions is shown in Figure 15.…”

Section: Magnetoelectric Propertiesmentioning

confidence: 99%

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca1-xSrx(Fe0.5Ta0.5)O3 Multiferroic Ceramics

Bhuiyan¹,

Gafur²,

Khan³

et al. 2017

MSA

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Conventional solid state reaction technique was used to synthesize Ca 1−x Sr x (Fe 0.5 Ta 0.5 )O 3 multiferroic ceramics (where x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5). Powder of ingredients was mixed thoroughly in stoichiometric amount and calcined at 1150˚C for 5 h. Disk and toroid shaped samples prepared from each composition were sintered at 1450˚C for 5 h. The XRD analysis confirms that all compositions are single phase cubic perovskite structure. The theoretical and bulk density increases with increase of Sr content, which may be attributed to the fact that the atomic weight and density of Sr are larger than those of Ca. The average grain size increased with increasing Sr content up to x = 0.2, and then decreased with further increase of Sr content. Frequency dependent dielectric constant shows usual dielectric dispersion at lower frequencies due to Maxwell-Wagner type interfacial polarization. The higher values of real and imaginary part of impedance at lower frequencies are also due to the fact that all kinds of polarization mechanism are present and increase with Sr content indicating the enhancement property of the composition. The continuous dispersion on increasing frequency contributes to the conduction phenomena. Two semicircles correspond to the grain boundary and grain resistance separately. The complex modulus analysis reveals the polaron hopping and negligibly small contribution of electrode effect. The continuous dispersion on increasing frequency may be contributed to the conduction phenomena. The ac conductivity, σ ac , was derived from the dielectric measurement and it increases with increase of frequency for all the compositions and can also be explained on the basis of polaron hopping mechanism. At higher frequencies conductive grains are more active, and thereby increases of hopping of charge carrier contribute to rise in conductivity. The real part of initial permeability increased with increasing Sr content up to x = 0.2, and 65then decreased further increasing the Sr content. Firstly, it increased due to the higher values of grain size, and then decreased with the Sr content due to the lowering the grain size. The saturation magnetization, M s , increases for x = 0.2 and then decreases with increasing Sr content due to the pore acted as a pinning centre of electron spin; thereby Ms decreases also due to the grain size which is well supported by the permeability results. The decrease of magnetoelectric voltage coefficient α ME with content may be attributed to the increased porosity in the sample. The presence of the pores breaks the magnetic contacts between the grains. The highest value of α ME is 42.22 mV·cm −1•Oe −1 for the composition x = 0.2 which is attributed to the enhanced mechanical coupling. It was revealed that there is a dramatic influence of Sr with content x = 0.2 and also has strong correlations on grain size as well as magnetic and magnetoelectric properties.

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Section: Magnetoelectric Propertiesmentioning

confidence: 99%

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca1-xSrx(Fe0.5Ta0.5)O3 Multiferroic Ceramics

Bhuiyan¹,

Gafur²,

Khan³

et al. 2017

MSA

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“…Since single phase multiferroics are rare and show some disadvantages, like low electrical resistivity or low magnetic transition temperatures, ferroelectric-ferromagnetic composites are often used to attain strong magnetoelectric effect as a "product property" of the material. The most popular compositions are those containing cobalt or nickel ferrite as a ferromagnetic phase and piezoelectric BaTiO 3 or Pb(ZrTi)O 3 as a ferroelectric phase [1][2][3][4][5]. This paper focuses on the studies of microstructure, dielectric, magnetic and magnetoelectric properties of bulk composites based on ferrite CoFe 2 O 4 (CF) and solid state solution of relaxor ferroelectric Pb(Fe 2/3 W 1/3 )O 3 (PFW) and normal ferroelectric PbTiO 3 (PT).…”

Section: Introductionmentioning

confidence: 99%

“…The diffuse relaxor transition of PFW is reported to be around 150 K and the antiferromagnetic transition to be at 350-380 K [8]. * corresponding author; e-mail: jkulawik@ite.waw.pl 3 was ball milled, pressed into pellets and subsequently sintered at 1173 K for 2 h. Phase composition of the samples was studied by an X'Pert Philips diffractometer. Dielectric properties were determined in a temperature range 218-773 K at frequencies of 10 Hz-2 MHz, using a LCR QuadTech meter.…”

Section: Introductionmentioning

confidence: 99%

Multiferroic Cobalt Ferrite-Lead Iron Tungstate Composites

2012

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The paper presents dielectric, magnetic and magnetoelectric properties of multiferroic bulk composites based on CoFe 2 O 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.

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“…In the last few years, the interest in magnetoelectric effect (ME) (Landau and Lifshitz, 1960) has increased both theoretically and experimentally in an amazing manner (Grossinger et al, 2008;Petrov et al, 2007a,b;Bichurin et al, 2003a,b). A variety of systems exhibit the ME effect, including single phase (de la Vega Reyes et al, 2007;Fuentes et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Effects of interface contacts on the magneto electro-elastic coupling for fiber reinforced composites

Espinosa‐Almeyda¹,

López-Realpozo²,

Rodrı́guez-Ramos³

et al. 2011

International Journal of Solids and Structures

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a b s t r a c tImperfect bonding between constituents is studied where displacements, electric and magnetic static potentials are considered to have a jump proportional to the normal component of the mechanical traction, electric displacement and magnetic flux. This condition may model various interface damages or the thin glue layer between two adjacent phases. They are termed as the mechanically compliant, dielectrically weakly capacitance and magnetically weakly inductance at the interface. It is shown that while the more imperfect the interface is, the overall properties become weaker, such as longitudinal shear stiffness, out-of-plane piezoelectric coupling, and magnetoelectric coupling. Out-of-plane piezomagnetic coupling, transverse dielectric permittivity and transverse dielectric permeability exhibit no influence by imperfect bonding. The imperfect interface proposed is mimicked by the springs, capacitors and inductances for the mechanical, electric and magnetic interaction between the phases and are highly sensitive to the interphase properties. The results are compared mainly with the self consistent model reported in the literature and good agreements are shown.

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The physics of magnetoelectric composites

Cited by 98 publications

References 24 publications

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca<sub>1-x</sub>Sr<sub>x</sub>(Fe<sub>0.5</sub>Ta<sub>0.5</sub>)O<sub>3</sub> Multiferroic Ceramics

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca<sub>1-x</sub>Sr<sub>x</sub>(Fe<sub>0.5</sub>Ta<sub>0.5</sub>)O<sub>3</sub> Multiferroic Ceramics

Multiferroic Cobalt Ferrite-Lead Iron Tungstate Composites

Effects of interface contacts on the magneto electro-elastic coupling for fiber reinforced composites

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The physics of magnetoelectric composites

Cited by 98 publications

References 24 publications

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca&lt;sub&gt;1-x&lt;/sub&gt;Sr&lt;sub&gt;x&lt;/sub&gt;(Fe&lt;sub&gt;0.5&lt;/sub&gt;Ta&lt;sub&gt;0.5&lt;/sub&gt;)O&lt;sub&gt;3&lt;/sub&gt; Multiferroic Ceramics

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca&lt;sub&gt;1-x&lt;/sub&gt;Sr&lt;sub&gt;x&lt;/sub&gt;(Fe&lt;sub&gt;0.5&lt;/sub&gt;Ta&lt;sub&gt;0.5&lt;/sub&gt;)O&lt;sub&gt;3&lt;/sub&gt; Multiferroic Ceramics

Multiferroic Cobalt Ferrite-Lead Iron Tungstate Composites

Effects of interface contacts on the magneto electro-elastic coupling for fiber reinforced composites

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Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca<sub>1-x</sub>Sr<sub>x</sub>(Fe<sub>0.5</sub>Ta<sub>0.5</sub>)O<sub>3</sub> Multiferroic Ceramics

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca<sub>1-x</sub>Sr<sub>x</sub>(Fe<sub>0.5</sub>Ta<sub>0.5</sub>)O<sub>3</sub> Multiferroic Ceramics