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Showing papers on "Magnetocapacitance published in 2012"


Journal ArticleDOI
TL;DR: In this paper, the influence of Mn doping on structural, dielectric, magnetic, magnetoelectric and optical properties of BiFeO3 nanoparticles was studied. And in order to explore the optical properties, their photoluminescent properties were also investigated.

145 citations


Journal ArticleDOI
TL;DR: It is reported that a YbFO thin-film heterostructure fabricated by adopting a hexagonal template surprisingly exhibits nonferroelastic ferroelectricity with the Curie temperature of 470 K.
Abstract: Multiferroics have received a great deal of attention because of their fascinating physics of order-parameter cross-couplings and their potential for enabling new device paradigms. Considering the rareness of multiferroic materials, we have been exploring the possibility of artificially imposing ferroelectricity by structurally tailoring antiferromagnets in thin-film forms. YbFeO3 (YbFO hereafter), a family of centrosymmetric rare-earth orthoferrites, is known to be nonferroelectric (space group Pnma). Here we report that a YbFO thin-film heterostructure fabricated by adopting a hexagonal template surprisingly exhibits nonferroelastic ferroelectricity with the Curie temperature of 470 K. The observed ferroelectricity is further characterized by an extraordinary two-step polarization decay, accompanied by a pronounced magnetocapacitance effect near the lower decay temperature, ∼225 K. According to first-principles calculations, the hexagonal P63/mmc–P63mc–P63cm consecutive transitions are primarily respons...

100 citations


Journal ArticleDOI
TL;DR: Bar Catalan et al. as mentioned in this paper simulated the dielectric permittivity e' of two relaxations in terms of a series of one intrinsic film-type and one extrinsic Maxwell-Wagner-type relaxation.
Abstract: The detection of true magnetocapacitance (MC) as a manifestation of magnetoelectric coupling (MEC) in multiferroic materials is a nontrivial task, because pure magnetoresistance (MR) of an extrinsic Maxwell-Wagner-type dielectric relaxation can lead to changes in capacitance [G. Catalan, Appl. Phys. Lett. 88, 102902 (2006)]. In order to clarify such difficulties involved with dielectric spectroscopy on multiferroic materials, we have simulated the dielectric permittivity e' of two dielectric relaxations in terms of a series of one intrinsic film-type and one extrinsic Maxwell-Wagner-type relaxation. Such a series of two relaxations was represented in the frequency- (f -) and temperature- (T -) dependent notations e' vs f and e' vs T by a circuit model consisting in a series of two ideal resistor-capacitor (RC) elements. Such simulations enabled rationalizing experimental f -, T-, and magnetic field- (H-) dependent dielectric spectroscopy data from multiferroic epitaxial thin films of BiMnO3 (BMO) and BiFeO3 (BFO) grown on Nb-doped SrTiO3. Concomitantly, the deconvolution of intrinsic film and extrinsic Maxwell-Wagner relaxations in BMO and BFO films was achieved by fitting f -dependent dielectric data to an adequate equivalent circuit model. Analysis of the H-dependent data in the form of determining the H-dependent values of the equivalent circuit resistors and capacitors then yielded the deconvoluted MC and MR values for the separated intrinsic dielectric relaxations in BMO and BFO thin films. Substantial intrinsic MR effects up to 65% in BMO films below the magnetic transition (TC ≈ 100 K) and perceptible intrinsic MEC up to −1.5% near TC were identified unambiguously.

79 citations


Journal ArticleDOI
TL;DR: In this paper, a class of hybrid composites (x)Ni0.75Zn0.25Fe2O4?(1???x)Ba(Ti 0.85Zr 0.15)O 3 synthesized via a solid state reaction method is investigated.
Abstract: A class of hybrid composites (x)Ni0.75Zn0.25Fe2O4?(1???x)Ba(Ti 0.85Zr 0.15)O 3 (for x variations 0, 0.20, 0.30 and 0.40) synthesized via a solid state reaction method is investigated. The structural analysis was carried out using an x-ray diffraction graph which reveals a mixed phase of the hybrid composites with spinel phase for ferrite component and perovskite phase for the ferroelectric component. The microstructural analysis and grain size determination is carried out using a field emission scanning electron microscope (FESEM). The relative dielectric constant with frequency variation (in the range of 100?Hz?1?MHz) and temperature at three fixed frequencies (100?Hz, 1?KHz and 10?KHz) is studied. The magnetic properties such as saturation magnetization (Ms ) and magnetic moment (?B) are calculated from the magnetic hysteresis loops obtained using a vibrating sample magnetometer (VSM). The value of remnant polarization for pure BZT is found to be 6.18??C?cm?2 and as the content of ferrite phase is increased up to 40?mol%, this value decreases. The magnetoelectric effect is studied using magnetocapacitance which takes a maximum value for 40?mol% addition of ferrite.

57 citations


Journal ArticleDOI
TL;DR: In this paper, the magnetocapacitance effect in YFeO3 single crystal was investigated and it was shown that the effect is accompanied with an increase in DC conductivity under magnetic field after the activation of electrons.
Abstract: YFeO3 single crystal displays two relaxor-like dielectric relaxations, one at low temperature (170 − 300 K) and one at high temperature (370 − 520 K), which are attributed to the activation of electrons and oxygen vacancies, respectively. Above the temperature at which electrons are activated, the sample displays a large magnetocapacitance effect. Comparison of the impedance Cole-Cole plots measured with and without applied magnetic field reveals that the occurrence of magnetocapacitance effect is accompanied with an increasing in DC conductivity under magnetic field after the activation of electrons, which is explained by the enhancement of electron jumping in Fe2+-O-Fe3+ chains by magnetic field. Thus the magnetocapacitance effect in YFeO3 single crystal can be explained by the combination of the Maxwell-Wagner space charge effect and/or magnetoresistance effect, depending on the frequency range.

52 citations


Journal ArticleDOI
TL;DR: The fabrication of a single nanowire multiferroic system, a new geometry, exhibiting room temperature magnetodielectric coupling is demonstrated, indicating the coexistence of more than one ferroic interaction in this composite system.
Abstract: The development of methods to economically synthesize single wire structured multiferroic systems with room temperature spin–charge coupling is expected to be important for building next-generation multifunctional devices with ultralow power consumption. We demonstrate the fabrication of a single nanowire multiferroic system, a new geometry, exhibiting room temperature magnetodielectric coupling. A coaxial nanotube/nanowire heterostructure of barium titanate (BaTiO3, BTO) and cobalt (Co) has been synthesized using a template-assisted method. Room temperature ferromagnetism and ferroelectricity were exhibited by this coaxial system, indicating the coexistence of more than one ferroic interaction in this composite system.

50 citations


Journal ArticleDOI
TL;DR: In this article, the authors present magnetodielectric measurements in single crystals of the cubic spin-1/2 compound Cu2OSeO3 and demonstrate that these are related to the field-driven evolution of a long-period helical phase, which is stabilized by the chiral Dzyaloshinskii-Moriya term DM.
Abstract: We present magnetodielectric measurements in single crystals of the cubic spin-1/2 compound Cu2OSeO3. A magnetic-field-induced electric polarization (P) and a finite magnetocapacitance (MC) is observed at the onset of the magnetically ordered state (T-c = 59 K). Both P and MC are explored in considerable detail as a function of temperature (T), applied field H-a, and relative field orientations with respect to the crystallographic axes. The magnetodielectric data show a number of anomalies which signal magnetic phase transitions, and allow us to map out the phase diagram of the system in the H-a-T plane. Below the 3-up-1-down collinear ferrimagnetic phase, we find two additional magnetic phases. We demonstrate that these are related to the field-driven evolution of a long-period helical phase, which is stabilized by the chiral Dzyaloshinskii-Moriya term DM . ((V) over bar x M) that is present in this noncentrosymmetric compound. We also present a phenomenological Landau-Ginzburg theory for the magnetic-field-induced electric polarization (MEH) effect, which is in excellent agreement with experimental data, and shows three main features: (i) the polarization P has a uniform as well as a long-wavelength spatial component that is given by the pitch of the magnetic helices, (ii) the uniform component of P points along the vector (HyHz,H-z H-x,H-x H-y),and (iii) its strength is proportional to eta(2)(parallel to) - eta(2)(perpendicular to)/2, where eta(parallel to) is the longitudinal and eta(perpendicular to) is the transverse (and spiraling) component of the magnetic ordering. Hence, the field dependence of P provides a clear signature of the evolution of a conical helix under a magnetic field. A similar phenomenological theory is discussed for the MC.

37 citations


Journal ArticleDOI
TL;DR: In this paper, a multiferroic composite thin films prepared from ferrimagnetic zinc ferrite (ZFO) and ferroelectric barium titanate (BTO) showed sizable magnetic exchange bias.
Abstract: Multiferroic composite thin films prepared from ferrimagnetic zinc ferrite (ZFO) and ferroelectric barium titanate (BTO) show sizable magnetic exchange bias. After field cooling in +3 T, an exchange-bias field of about −37 mT for a 65% ZFO/35% BTO and of about −34 mT for a 35% ZFO/65% BTO composite is observed at 10 K. Exchange biasing is accompanied by a significant vertical loop shift of about 10% of the total saturation magnetization after field cooling in 3 T. The composite films show simultaneous ferromagnetic, ferroelectric and magnetocapacitance effects. Depending on the ZFO to BTO ratio of the target for pulsed laser deposition, the composite films show either preferential spinel- or perovskite-like X-ray diffraction patterns. Raman spectra of the composites are dominated by broadened peaks at positions near the phase-pure BTO or doped ZFO. The composite films show nm-size amorphous precipitates in a ZFO-like matrix, which are most probably responsible for the observed exchange bias effects.

31 citations


Journal ArticleDOI
TL;DR: In this article, the optical, magnetocapacitance and dielectric properties of different composite films of BiFeO 3 poly(vinylidene-fluoride) (with concentration of biFeO3 ; 70, 60, 50 and 40 ) are reported for first time.

29 citations


Journal ArticleDOI
TL;DR: In this paper, the magnetocapacitance of spin and valley polarized silicene in an external perpendicular magnetic field was investigated and the interplay of spin orbit interaction and the perpendicular electric field was clarified.
Abstract: Despite their structural similarity, the electronic properties of silicene are fundamentally different from those of well-known graphene due to the strong intrinsic spin orbit interaction and buckled structure of silicene. We address the magnetocapacitance of spin and valley polarized silicene in an external perpendicular magnetic field to clarify the interplay of the spin orbit interaction and the perpendicular electric field. We find that the band gap is electrically tunable and show that the magnetocapacitance exhibits beating at low and splitting of the Shubnikov de Haas oscillations at high magnetic field.

27 citations


Journal ArticleDOI
TL;DR: In this paper, temperature-dependent impedance spectroscopy was used to study the dielectric response of thin films of Bi0.9La0.1/2NiMnO6 oxide and showed that the measured magnetocapacitance arises from the magnetoresistance of the films.
Abstract: We have used temperature-dependent impedance spectroscopy to study the dielectric response of thin films of ferromagnetic and ferroelectric (Bi0.9La0.1)(2)NiMnO6 oxide. This technique has allowed us to disentangle its intrinsic dielectric response and extract the dielectric permittivity of similar to 220, which is in close agreement with bulk values but significantly smaller than early reported values for similar thin films. The permittivity is found to be temperature independent in the vicinity of the ferromagnetic transition temperature and independent of magnetic field. We have shown that the measured magnetocapacitance arises from the magnetoresistance of the films, thus indicating a negligible magnetoelectric coupling in these double perovskites, probably due to the different energy scales and mechanisms of ferroelectric and magnetic order.

Journal ArticleDOI
TL;DR: In this paper, the strain-induced magnetocapacitance of multiferroic hybrid heterostructures has been investigated and shown to be strongly dependent on the strain state of a ferroelectric constituent.
Abstract: We report a theoretical calculation of the strain-mediated magnetocapacitance of ferroelectric-ferromagnetic heterostructures. Our nonlinear theory predicts that this magnetocapacitance strongly depends on the strain state of a ferroelectric constituent. For multiferroic hybrids comprising a BaTiO3 or Pb(Zr0.5Ti0.5)O3 film and a FeBSiC, Terfenol-D, or FeGa substrate, the magnetocapacitive coefficient generally has a giant value ∼10−4 Oe−1. Remarkably, its magnitude further increases drastically near the strain-induced phase transition at which the out-of-plane polarization appears in the ferroelectric film. As a result, the magnetocapacitance of hybrids including Terfenol-D may exceed 100% already at the magnetic field of about 600 Oe. These theoretical results provide guidelines for the fabrication of multiferroic heterostructures exhibiting a strong magnetodielectric effect.

Journal ArticleDOI
TL;DR: In this paper, the magnetic and magnetocaloric effect in antiferromagnetic perovskite-type EuTiO 3 was investigated using a Heisenberg Hamiltonian.

Journal ArticleDOI
17 Dec 2012
TL;DR: In this article, anisotropic properties of magnetism and dielectricity in CaBaCo4O7 single crystal, which has layered structure consisting of CoO4 tetrahedra, were investigated.
Abstract: We have investigated anisotropic properties of magnetism and dielectricity in CaBaCo4O7 single crystal, which has layered structure consisting of CoO4 tetrahedra. The crystallographic symmetry of CaBaCo4O7 is Pbn21 at room temperature, which breaks the inversion symmetry. The magnetic moments along the a- and b-axes rise at 64 K, suggesting a weak ferromagnetism. We have also observed an increase of electric polarization and a peak of dielectric constant along the b- and c-axes at the magnetic transition temperature. In addition, the large magnetocapacitance effect was observed near above the transition temperature: Δ∊c(Hb)/∊c(0) ≡ [∊c(Hb) - ∊c(0)]/∊c(0) reaches over 50 % at 68 K.

Journal ArticleDOI
TL;DR: In this article, the strain-mediated magnetocapacitance of 1-3-type vertical ferroelectric-ferromagnetic nanocomposite films epitaxially grown on different cubic substrates is theoretically calculated using the nonlinear thermodynamic theory combined with elastic theory.
Abstract: The strain-mediated magnetocapacitance (MC) of 1–3-type vertical ferroelectric–ferromagnetic nanocomposite films epitaxially grown on different cubic substrates is theoretically calculated using the nonlinear thermodynamic theory combined with elastic theory. The dependences of relative dielectric constant and strain sensitivity of permittivity for the ferroelectric film on the in-plane and out-of-plane misfit strains are obtained. Our results show that the MC effect strongly depends on the in-plane misfit strain and ferromagnetic volume fraction in the nanocomposite films. The calculated MC for the BaTiO3–CoFe2O4 nanocomposite film grown on the SrTiO3 substrate is consistent with the experimental result. Furthermore, a giant MC, which is enhanced by 1–2 orders of magnitude than those reported in experiments, can be obtained for the BaTiO3–CoFe2O4 system grown on the MgO substrate near the transition from the aa-phase to the r-phase. Our result provides a new method for the design of multiferroic nanocomposites with colossal MC effect by optimizing the ferromagnetic phase and substrate types to realize their applications in magnetic-field-controlled electric devices, such as magneto-oscillators, magnetovaractors and magnetoelectric sensors.

Journal ArticleDOI
TL;DR: In this paper, the authors reported synthesis of nanoparticles of Sr0.5Ba0.6 and Co1.2−xMnxFe1.8O4 via ceramic and hydroxide co-precipitation routes, respectively.
Abstract: The paper reports synthesis of nanoparticles of Sr0.5Ba0.5Nb2O6 (SBN) and Co1.2−xMnxFe1.8O4 (CMFO) via ceramic and hydroxide co-precipitation routes, respectively. The nanopowders of SBN–CMFO0.1 (MSBN0.1) and SBN–CMFO0.3 (MSBN0.3) are compacted together to form the desired magnetoelectric/magnetodielectric (ME/MD) composites. The Bi2O3 is used as a sintering aid. The Bi2O3 at three weight percent is observed to cause agglomeration of SBN and CMFO particles and improve the magnetomechanical coupling. The paper reports synthesis, structural and morphological studies on the MSBN composites. The composites are investigated for their dielectric, ME and MD properties. The results on the magnetocapacitance (MC) are observed interesting and could be correctly understood in terms of the stress-induced variation in the dielectric constant. The MC is observed to remain fairly constant between 10 and 500 kHz and possess a useful magnitude of nearly 4 %.

Journal ArticleDOI
TL;DR: A colossal magnetocapacitance effect near room temperature in BiFeO 3 /La 5/8 Ca 3/8 MnO 3 epitaxial film was found in this article.

Journal ArticleDOI
TL;DR: In this article, the effect of electric current and magnetic field on the transport behavior of the ferromagnet-ferroelectric-type composite 0.8(La 0.55Ca 0.45MnO3) was investigated.

Journal ArticleDOI
TL;DR: In this paper, the effect of cobalt dopant on the structural, electric, and magnetic properties of polycrystalline perovskite (KNb0.95Co0.05O3) ceramic was studied.

Journal ArticleDOI
TL;DR: In this article, a mesoporous silica with a pore diameter of around 5 nm was synthesized by a solution technique and the dielectric loss of the nanocomposite was fairly low (~ 0.01).

Journal ArticleDOI
TL;DR: In this paper, the authors show that simple ionic model is not suitable for consistent description of the properties of the system, and that it fails to explain the trends in the lattice parameters and the chemical shifts of the absorption edges.

Journal ArticleDOI
TL;DR: In this article, the synthesis and magnetodielectric properties of La0.67Sr0.33MnO3 (LSMO), Ba0.7Sr 0.3TiO3, and BST/LSMO thin film heterostructures are discussed.
Abstract: The paper discuses synthesis and magnetodielectric properties of La0.67Sr0.33MnO3 (LSMO), Ba0.7Sr0.3TiO3 (BST), and BST/LSMO thin film heterostructures. The XRD spectra are determined for confirmation of the crystal structure of LSMO, BST and formation of a pure bi-phase composite. The paper presents variation of Cp and tanδ as a function of frequency between 100 Hz to 1 MHz and applied magnetic field up to 0.6 T. The observed variation of Cp, tanδ, magnetocapacitance and impedance spectra are analyzed in terms of a possible equivalent circuit model. The present analysis shows that the method of impedance spectra could be used to separate out the possible contributions.

Journal ArticleDOI
TL;DR: In this article, the magnetic properties of Fe-doped potassium-sodium tantalate niobate (K0.5Na 0.5(Nb0.95Ta0.05)1-xFexO3-x; x = 0 and 0.01) ceramics prepared by the conventional sintering method were investigated.
Abstract: Ferroelectric and magnetic properties of Fe-doped potassium–sodium tantalate niobate (K0.5Na0.5(Nb0.95Ta0.05)1-xFexO3-x; x = 0 and 0.01) ceramics prepared by the conventional sintering method were investigated. In comparison with pure ceramics, the 0.01 Fe-doped ceramics show magnetic and ferroelectric properties simultaneously at room temperature. The relative dielectric constant significantly decreases after applying a magnetic field for the Fe-doped ceramics, indicating the coupling between ferroelectric and ferromagnetic orders. Magnetocapacitance of -0.77% was observed at room temperature and 50 kHz by the application of a magnetic field of 5000 Oe.

Journal ArticleDOI
TL;DR: The correlation between colossal magnetocapacitance (CMC) and colossal magnetoresistance (CMR) in CdCr2S4 system has been revealed in this article.
Abstract: The correlation between colossal magnetocapacitance (CMC) and colossal magnetoresistance (CMR) in CdCr2S4 system has been revealed. The CMC is induced in polycrystalline Cd0.97In0.03Cr2S4 by annealing in cadmium vapor. At the same time, an insulator-metal transition and a concomitant CMR are observed near the Curie temperature. In contrast, after the same annealing treatment, CdCr2S4 displays a typical semiconductor behavior and does not show magnetic field dependent dielectric and electric transport properties. The simultaneous occurrence or absence of CMC and CMR effects implies that the CMC in the annealed Cd0.97In0.03Cr2S4 could be explained qualitatively by a combination of CMR and Maxwell-Wagner effect.

Journal ArticleDOI
TL;DR: In this paper, HoMnO 3 films were grown on pure and Nb-doped SrTiO 3 (001) substrates by pulsed laser deposition and the films showed a distinct dielectric anomaly at 16-K that depended on voltage and slightly on frequency in the range between 1-kHz and 1-MHz.

Journal ArticleDOI
TL;DR: In this article, the authors investigated magnetic domain wall induced capacitance variation as a tool for the detection of magnetic reversal in magnetic nanowires for in-plane and out-of-plane (Co/Pd) magnetization configurations.
Abstract: The authors have investigated magnetic domain wall induced capacitance variation as a tool for the detection of magnetic reversal in magnetic nanowires for in-plane (NiFe) and out-of-plane (Co/Pd) magnetization configurations. The switching fields in the capacitance measurements match with that of the magnetoresistance measurements in the opposite sense. The origin of the magnetocapacitance has been attributed to magnetoresistance. This magnetocapacitance detection technique can be useful for magnetic domain wall studies.

Journal ArticleDOI
TL;DR: In this article, the capacitance properties of phase separated manganite heterojunctions were investigated under a magnetic field and showed that the tunability of capacitance can be explained by phase separation.
Abstract: Manganite-based heterojunctions La1−xCaxMnO3/SrTiO3: Nb (0.5 wt. %) with x = 0.2, 0.3, 0.375, 0.4, 0.5, 0.6, and 0.7 have been fabricated, and the lattice constants of La1−xCaxMnO3 films are experimentally studied. The capacitance characteristics of those junctions under a magnetic field have been investigated. Obvious magnetocapacitance was observed in La0.7Ca0.3MnO3/Nb-SrTiO3 p-n junction near the Curie temperature (TC) of La0.7Ca0.3MnO3 at 0.75 T. The result can be explained by phase separation. This study demonstrates the remarkable tunability of the capacitance for phase separated manganite heterojunctions, which may lead to some potential applications.

Journal ArticleDOI
TL;DR: In this paper, the authors fabricated three different thin films of BTO, BTO/CNF and CNF/BTO/cNF for magneto-capacitor and studied their crystalline structure, surface and interface morphol-ogy, and magnetic and electrical properties.
Abstract: /Si substratesby using pulsed laser deposition (PLD) system. We fabricated three different thin films of BTO, BTO/CNF andCNF/BTO/CNF for magneto-capacitor and studied their crystalline structure, surface and interface morphol-ogy, and magnetic and electrical properties. When three different structures of multilayered thin film werecompared, magnetization of CNF/BTO/CNF thin films was decreased by magnetic and dielectric interaction.Also we confirmed that capacitance of CNF/BTO/CNF multilayered thin film was enhanced as being near tet-ragonal structure with increasing of c/a ratio because of atomic bonding at interface between BTO dielectricand CNF magnetic materials. Finally, we studied the change of the capacitance of CNF/BTO/CNF multilay-ered thin film with magnetic field for emergence of magnetocapacitance and suggested a possibility of enhancedcapacitance.Keywords : magnetocapacitance, multilayer thin film, pulsed laser deposition, interface effect

Journal ArticleDOI
TL;DR: In this paper, the authors investigated magnetic domain wall induced capacitance variation as a tool for the detection of magnetic reversal in magnetic nanowires for in-plane and out-of-plane (Co/Pd) magnetization configurations.
Abstract: The authors have investigated magnetic domain wall induced capacitance variation as a tool for the detection of magnetic reversal in magnetic nanowires for in-plane (NiFe) and out-of-plane (Co/Pd) magnetization configurations. The switching fields in the capacitance measurements match with that of the magnetoresistance measurements in the opposite sense. The origin of the magnetocapacitance has been attributed to magnetoresistance. This magnetocapacitance detection technique can be useful for magnetic domain wall studies.

Journal ArticleDOI
TL;DR: In this paper, multiferroic composite films of (i) Co0.6Zn 0.4Fe2O4-BaTi 0.7Zr 0.3O3(PZT)-poly (vinylidene-fluoride)(PVDF) were prepared by hot press method for magneto-dielectric studies.
Abstract: Multiferroic composite films of (i) Co0.6Zn0.4Fe2O4(CZFO)-PbTi0.7Zr0.3O3(PZT)-poly (vinylidene-fluoride)(PVDF) and (ii) Co0.6Zn0.4Fe2O4-BaTi0.7Zr0.3O3(BZT)-PVDF were prepared by hot press method for magneto-dielectric studies. Different multiferroic composite films were named as CPT-1 (CZFO:PZT; 3:1) CPT-2 (CZFO:PZT; 3:2), CPT-3(CZFO:PZT; 3:3), CBT-1 (CZFO:BZT; 3:1), CBT-2 (CZFO:BZT; 3:2) and CBT-3 (CZFO:BZT 3:3). The entire composites were made with 70% ceramic and 30% wt. PVDF polymer. Line scanning by Scanning electron microscope (SEM) and Atomic force microscopy (AFM) images shows a homogeneous distribution of constituents in the composite film. It is observed that the dielectric permittivity (e´) follows the MaxwellWagner model. Remnant polarization (Pr) and magnetocapacitance (MC) were found to vary with an applied magnetic field at room temperature. The absolute value of the magnetocapacitance (MC) was found higher for CBT-2 (MC ~ 0.79%) than for CBT-3 (MC ~ 0.57%) but lower than for CPT-3 (MC ~ 1.2%). A linear fit of the MC with M2 yields the magnetoelectric quadratic coupling constant |γ| ~ 4.96 × 10-6 for CBT-1, which is around 150 times lower than for CPT-1 (|γ| ~ 7.92 × 10-4).