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Evidence of self-biased magnetoelectric coupling in eco-friendly (Na0.41K0.09Bi0.5TiO3-Ba0.85Ca0.15Zr0.1Ti0.9O3)-(CoFe2O4) particulate composites

Pal, Munendra ; Srinivas, Adiraj ; Xavier, Deepa ; Subramanian, V. ; Asthana, Saket

Journal of magnetism and magnetic materials, 2024-05, Vol.598, Article 172060 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Evidence of self-biased magnetoelectric coupling in eco-friendly (Na0.41K0.09Bi0.5TiO3-Ba0.85Ca0.15Zr0.1Ti0.9O3)-(CoFe2O4) particulate composites
  • Autor: Pal, Munendra ; Srinivas, Adiraj ; Xavier, Deepa ; Subramanian, V. ; Asthana, Saket
  • Assuntos: Lead-free multiferroic composite ; Magnetism ; Magneto-dielectric effect ; Magnetoelectric coupling ; Self-biased magnetoelectric coupling
  • É parte de: Journal of magnetism and magnetic materials, 2024-05, Vol.598, Article 172060
  • Descrição: [Display omitted] •(1-x)NKBCZT-xCFO (0–3) particulate composites have been synthesized by solid-state reaction method.•Structural and microstructural study reveals the co-existence of ferroelectric and ferrite phases in the composites.•P-E and M-H hysteresis loops revealed the multiferroic nature of all the composites.•The NKBCZT-CFO composites exhibit the non-Debye type relaxation and relaxor nature.•Composites exhibit the self-biased magnetoelectric coupling ∼4.09 mV/cm.Oe for 30 mol% CFO.•High magneto-capacitance (MC) ∼5.6 % is found for 20 mol% CFO. The magnetoelectric (ME) properties of eco-friendly 1-x(0.94Na0.41K0.09Bi0.5TiO3-0.06Ba0.85Ca0.15Zr0.1Ti0.9O3)-x (CoFe2O4) (NKBCZT-CFO) with x = 0, 0.1, 0.2, 0.3 and 0.4 particulate composites were investigated. The X-ray diffraction studies provided evidence for the simultaneous existence of constituent phases (ferroelectric and ferromagnetic) in the composite. The structural and surface morphology analysis of the composite affirmed the homogeneous and densely packed distribution of CFO grains within the NKBCZT matrix. The composite's multiferroic behavior at room temperature was confirmed through the characterization of P vs E and M vs H hysteresis loops. The observed values of remnant polarization (Pr) and coercive field (Ec) are 26.7 μC/cm2 and 35.5 kV/cm, respectively, for 10 mol% of CFO. The increase in CFO content resulted in a decrease in the ferroelectric properties, possibly due to the conductive behaviour exhibited by CFO, and correlated with leakage current measurement. For the composite containing 40 mol% of CFO, the estimated values of remanent (Mr), saturation (Ms) magnetization, coercive field (Hc), and magnetic moment (µB) are 2.35 emu/g, 21.85 emu/g, 104.2 Oe, and 0.86 µB, respectively. The non-Debye type dielectric relaxation processes have been observed in the composites, and the electron hopping mechanism resulted in a higher dielectric constant (εʹ). Enhancement in relaxor nature had been observed through Vogel-Fulcher analysis with CFO content. The evidence of ME coupling was revealed through the direct ME voltage coefficient (αME) and magnetocapacitance (MC) measurement. The observed maximum value of MC measured at 1 kHz for the 20 mol% CFO is ∼5.6 %. Self-biased ME coupling (non-zero αME at HDC = 0 Oe) was observed in 20 and 30 mol% of CFO composite. The highest measured value of αME for 20 and 30 mol% CFO is 3.63 mV/cm.Oe and 4.09 mV/cm.Oe at HDC = 0 Oe respectively. The strong ME interaction and significant value of self-biased ME αME suggest that these composites can be explored for magnetic sensor and ME memory device applications.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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