Magnetoelectric ceramic composites with double-resonant permittivity and permeability in GHz range: A route towards isotropic metamaterials

Ciomaga, Cristina Elena; Dumitru, Ioan; Mitoşeriu, Liliana; Galassi, Carmen; Iordan, Alexandra Raluca; Airimioaei, Mirela; Palamaru, Mircea Nicolae

doi:10.1016/j.scriptamat.2010.01.005

Cited by 27 publications

(17 citation statements)

References 15 publications

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“…4a. Since in this frequency range the domain wall motion can not follow the AC field, the frequency resonance likely corresponds to the spin resonance [24]. As reported, the resonance frequency is determined by the variation of the embedded magnetic particle's magnetization.…”

Section: Resultsmentioning

confidence: 70%

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Electric-field switch of magnetization in BaTiO3–Na0.5Bi0.5TiO3–NiFe2O4 composite

Han

Wang

et al. 2015

J Mater Sci: Mater Electron

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We demonstrate magnetoelectric coupling effect in (80BaTiO 3 -20Na 0.5 Bi 0.5 TiO 3 )-NiFe 2 O 4 , abbreviated as (BTO-NBT)-NFO, synthesized by the solid-state sintering method. The dielectric, magnetic and magnetoelectric behaviors of (100-x) (BTO-NBT)-xNFO (x = 35, 45, 55) particulate composites are investigated. The composites show coexistence of dielectric properties and magnetic behaviors. A reversible, room temperature magnetization switch determined by an electric field in (100-x) (BTO-NBT)-xNFO (x = 35, 45, 55) composites is observed. This effect of electric-field-controlled magnetization is believed to originate from the combination of strain-induced and charge-mediated coupling. Magnetoelectric relaxation occurs when the magnetization is switched electrically, it is especially pronounced for the composite with x = 45 and 55, which could be attributed to the increase in the conductivity. A maximal converse magnetoelectric coefficient of 3.736 Oe cm V -1 is obtained for 65(BTO-NBT)-35NFO modulated by an electric field of 2 9 10 6 V m -1 at a bias field of 1000 G. Such electrically control of magnetization switch shows great promises for the read and write operations to be performed using only electric field for writing and small magnetic field for reading.

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Section: Resultsmentioning

confidence: 70%

“…With increasing the amount of magnetic phase, an increase tendency of the resonance frequency is observed. The observed increase could be explained by the increase of the demagnetization factor due to the decrease of the distance between magnetic grains with increasing x amount [24].…”

Section: Resultsmentioning

confidence: 94%

Electric-field switch of magnetization in BaTiO3–Na0.5Bi0.5TiO3–NiFe2O4 composite

Han

Wang

et al. 2015

J Mater Sci: Mater Electron

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“…The dielectric resonance in NiFe 2 O 4 may occur at high frequencies [53], beyond our measurement range. The resonance frequency shifts to higher frequencies with increasing NiFe 2 O 4 content as shown in the top-left inset in figure 6, as in magnetodielectric composites [54][55][56]. The resonances observed in these ceramics are due to the activation of different piezoelectric vibration modes, which originate from particulate microstructural features and random orientation of the crystallites with respect to the applied field.…”

Section: Electrical Propertiesmentioning

confidence: 90%

“…The resonances observed in these ceramics are due to the activation of different piezoelectric vibration modes, which originate from particulate microstructural features and random orientation of the crystallites with respect to the applied field. The presence of the magnetic phase suppresses the piezoelectric resonance [56].…”

Section: Electrical Propertiesmentioning

confidence: 99%

Hydrothermal synthesis and properties of NiFe₂O₄@BaTiO₃composites with well-matched interface

Zhou

Liu

et al. 2012

Science and Technology of Advanced Materials

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NiFe 2 O 4 @BaTiO 3 multiferroic composite particles were produced by a simple hydrothermal method in two steps: preparing NiFe 2 O 4 nanoparticles and then synthesizing core-shell nanocomposites. Multiferroic composite ceramics were sintered from these powders. X-ray diffraction, Raman scattering and energy dispersive x-ray analyses indicated that the core-shell composites with a NiFe 2 O 4 core and BaTiO 3 shell were formed in the hydrothermal environment. Different types of sharp interfaces were self-assembled owing to the minimization of direct elastic energy. The saturation magnetization of the composites linearly increased with the NiFe 2 O 4 content while the dielectric constant decreased. A dielectric peak appeared at around 460• C because of the oxygen vacancies in the BaTiO 3 ceramics. It resulted in an enhancement of magnetic permeability in the composites, indicating magnetoelectric coupling that was also observed by direct magnetoelectric measurements.

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“…15 (a) and (b). A strong dielectric resonance peak is observed above 100MHz, which originates from the dipole's vibration (Bai et al, 2006) or the followed piezoelectric vibration (Ciomaga et al, 2010). The resonance frequency increases with the reduction of PNNT amount and shifts out of the upper limit of measurement when the weight fraction of PNNT is lower than 0.4 (Fig.…”

Section: The Dielectric Resonancementioning

confidence: 96%

The Ferroelectric-Ferromagnetic Composite Ceramics with High Permittivity and High Permeability in Hyper-Frequency

Bai¹

2010

Ferroelectrics

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Magnetoelectric ceramic composites with double-resonant permittivity and permeability in GHz range: A route towards isotropic metamaterials

Cited by 27 publications

References 15 publications

Electric-field switch of magnetization in BaTiO3–Na0.5Bi0.5TiO3–NiFe2O4 composite

Electric-field switch of magnetization in BaTiO3–Na0.5Bi0.5TiO3–NiFe2O4 composite

Hydrothermal synthesis and properties of NiFe₂O₄@BaTiO₃composites with well-matched interface

The Ferroelectric-Ferromagnetic Composite Ceramics with High Permittivity and High Permeability in Hyper-Frequency

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Magnetoelectric ceramic composites with double-resonant permittivity and permeability in GHz range: A route towards isotropic metamaterials

Cited by 27 publications

References 15 publications

Electric-field switch of magnetization in BaTiO3–Na0.5Bi0.5TiO3–NiFe2O4 composite

Electric-field switch of magnetization in BaTiO3–Na0.5Bi0.5TiO3–NiFe2O4 composite

Hydrothermal synthesis and properties of NiFe2O4@BaTiO3composites with well-matched interface

The Ferroelectric-Ferromagnetic Composite Ceramics with High Permittivity and High Permeability in Hyper-Frequency

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Hydrothermal synthesis and properties of NiFe₂O₄@BaTiO₃composites with well-matched interface