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Adem, Umut; Wang, L.; Fausti, Daniele; Schottenhamel, W.; Loosdrecht, P.H.M. van; Vasiliev, A. N.; Безматерных, Л. Н.; Buechner, B.; Heß, Christian; Klingeler, R.; Büchner, B.

doi:10.1103/physrevb.82.064406

Cited by 61 publications

(51 citation statements)

References 24 publications

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“…The small difference in the frequency value obtained from the data may be due to the use of polycrystalline sample in the present study. It is to be noted that the fit of Barrett equation with deviates just above T N suggesting a shifting of the frequency around this temperature similar to the behavior observed in TbFe 3 (BO 3 ) 4 [21].…”

Section: Resultssupporting

confidence: 67%

Multiferroicity and magneto-electric effect in Gd2BaNiO5

Chowki

Basu

Singh

et al. 2014

Journal of Applied Physics

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We report the observation of electric polarization in the magnetically ordered state of the Haldane chain compound, Gd 2 BaNiO 5 , with strongly correlated magnetic and dielectric properties. The results of dc magnetic susceptibility and heat capacity measurements indicate two magnetic transitions, one corresponding to the anti-ferromagnetic order at T N ~55 K and the other to spin-reorientation transition at T SR ~24 K. The dielectric permittivity and loss (tanδ) also exhibit anomalies in the vicinity of T SR and T N respectively. Below the spin-reorientation transition, concurrently magnetic-field-induced spin-flop and the meta-electric transitions are observed at a critical magnetic field in isothermal magnetization and magneto-dielectric results respectively. Another interesting finding is that Δ (= changes its sign at the critical magnetic field. The origin of the observed magneto-electric effect is discussed on the basis of spin-phonon coupling.

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Section: Resultssupporting

confidence: 67%

Multiferroicity and magneto-electric effect in Gd2BaNiO5

Chowki

Basu

Singh

et al. 2014

Journal of Applied Physics

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“…A sample of dimensions 10.7 mm × 4.3 mm and a thickness of 0.43 mm was used. Data on ε r vs f for a series of H over the range [16][17][18][19][20][21][22][23][24] GHz are shown in Fig. 3.…”

Section: Magneto-dielectric Effects: Results and Discussionmentioning

confidence: 99%

“…Measurements of the real (ε r ) and imaginary (ε r ) parts of the relative permittivity have been carried out over [16][17][18][19][20][21][22][23][24] GHz with rectangular platelets of samples of as-assembled powder in waveguides and from data on transmission and reflection coefficients of microwave power through the waveguide. The…”

Section: Discussionmentioning

confidence: 99%

“…[16][17][18][19][20][21][22][23][24][25] It is a powerful tool for investigations on the nature of direct-ME effects in single phase and composite multiferroics. There have been several reports in recent years on the observation of MDE due to phase transitions in single phase multiferroics [16][17][18][19] or magnon-phonon coupling in antiferromagnets. 21,22 But there have been very few reports on the observation and modeling of MDE in composite multiferroics.…”

Section: -6mentioning

confidence: 99%

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High frequency magneto-dielectric effects in self-assembled ferrite-ferroelectric core-shell nanoparticles

et al. 2014

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Magneto-dielectric effects in self-assembled core-shell nanoparticles of nickel ferrite (NFO) and barium titanate (BTO) have been investigated in the millimeter wave frequencies. The core-shell nano-composites were synthesized by coating 100 nm nickel ferrite and 50 nm barium titanate nanoparticles with complementary coupling groups and allowing them to self-assemble in the presence of a catalyst forming heterogeneous nanocomposites. Magneto-electric (ME) characterization of as-assembled particles has been carried out by measurements of the relative permittivity ɛr as a function of frequency f under an applied static magnetic field H over 16–24 GHz. Measurements show an H-induced decrease in ɛr of 1 to 1.5%. But a giant magneto-dielectric effect with an H-induced change in permittivity as high as 28% is measured under dielectric resonance in the samples. A strong ME coupling was also evident from H-tuning of dielectric resonance in the composites. A theory for the high frequency magneto-dielectric effect has been developed and consists of the following steps. First the Bruggeman model is used to estimate the effective dielectric constant for the shell consisting of the BTO particles and voids considered as spherical air-pores. Then the permittivity for the core and shell is estimated taking into consideration the sample porosity. Finally the H-dependence of the permittivity due to ME interactions is calculated from the free energy considerations. Estimated ɛr vs. H and dielectric resonance frequency vs. H characteristics are in general agreement with the data.

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“…The variety of the magnetic anisotropy of the R 3+ moments (R = Y, Pr, Nd, Sm, Gd, and Tb) combined with the interaction between the Fe 3+ and R 3+ moments (f -d coupling) gives rise to diverse magnetoelectric (ME) effects as a function of the R 3+ ions [16][17][18][19][20][21]. In these compounds the mechanism of magnetoelectricity is explained by the spin-dependent metal-ligand hybridization model [22,23].…”

Section: Introductionmentioning

confidence: 99%

Magnetic model in multiferroicNdFe3(BO3)4investigated by inelastic neutron scattering

et al. 2015

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We performed inelastic neutron scattering measurements on single crystals of NdFe 3 ( 11 BO 3 ) 4 to explore the magnetic excitations, to establish the underlying Hamiltonian, and to reveal the detailed nature of hybridization between the 4f and 3d magnetism. The observed spectra exhibiting a couple of key features, i.e., anticrossing of Nd and Fe excitations and anisotropy gap at the antiferromagnetic zone center, are explained by the magnetic model including spin interaction in the framework of weakly coupled Fe 3+ chains, interaction between the Fe 3+ and Nd 3+ moments, and single-ion anisotropy derived from the Nd 3+ crystal field. The combination of the measurements and calculations reveals that the hybridization between 4f and 3d magnetism propagates the local magnetic anisotropy of the Nd 3+ moment to the Fe 3+ network, leading to the determination of the bulk structure of both electric polarization and magnetic moment in the multiferroics of the spin-dependent metal-ligand hybridization type.

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Magnetodielectric and magnetoelastic coupling inTbFe3(BO3)4

Cited by 61 publications

References 24 publications

Multiferroicity and magneto-electric effect in Gd2BaNiO5

Multiferroicity and magneto-electric effect in Gd2BaNiO5

High frequency magneto-dielectric effects in self-assembled ferrite-ferroelectric core-shell nanoparticles

Magnetic model in multiferroicNdFe3(BO3)4investigated by inelastic neutron scattering

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