Temperature dependence of the local electromagnetic field at the Fe site in multiferroic bismuth ferrite

Dang, Thien Thanh; Schell, Juliana; Boa, A. G.; Lewin, D.; Marschick, Georg; Dubey, Astita; Escobar-Castillo, M.; Noll, Cornelia; Beck, R.; Zyabkin, Dmitry; Глухов, К. Э.; Yap, Ian C. J.; Gerami, A. Mokhles

doi:10.1103/physrevb.106.054416

Cited by 7 publications

(4 citation statements)

References 41 publications

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“…Although BFO exhibits the magnetoelectric effect at room temperature, as confirmed in measurements with hyperfine interaction techniques [5,6], the magnetoelectric coupling in BFO is too weak for practical applications, due to a modification of the antiferromagnetic G-type spin configuration by a long-range spiral spin superstructure. This spiral spin superstructure cancels the macroscopic magnetization and, thus, prevents a linear magnetoelectric effect.…”

Section: Introductionmentioning

confidence: 96%

Temperature Dependence of the Hyperfine Magnetic Field at Fe Sites in Ba-Doped BiFeO3 Thin Films Studied by Emission Mössbauer Spectroscopy

et al. 2023

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Emission 57Fe Mössbauer spectroscopy (eMS), following the implantation of radioactive 57Mn+ ions, has been used to study the temperature dependence of the hyperfine magnetic field at Fe sites in Ba-doped BiFeO3 (BFO) thin films. 57Mn β decays (t1/2 = 90 s) to the 14.4 keV Mössbauer state of 57Fe, thus allowing online eMS measurements at a selection of sample temperatures during Mn implantation. The eMS measurements were performed on two thin film BFO samples, 88 nm and 300 nm thick, and doped to 15% with Ba ions. The samples were prepared by pulsed laser deposition on SrTiO3 substrates. X-ray diffraction analyses of the samples showed that the films grew in a tetragonal distorted structure. The Mössbauer spectra of the two films, measured at absorber temperatures in the range 301 K–700 K, comprised a central pair of paramagnetic doublets and a magnetic sextet feature in the wings. The magnetic component was resolved into (i) a component attributed to hyperfine interactions at Fe3+ ions located in octahedral sites (Bhf); and (ii) to Fe3+ ions in implantation induced lattice defects, which were characterized by a distribution of the magnetic field BDistr. The hyperfine magnetic field at the Fe probes in the octahedral site has a room temperature value of Bhf = 44.5(9) T. At higher sample temperatures, the Bhf becomes much weaker, with the Fe3+ hyperfine magnetic contribution disappearing above 700 K. Simultaneous analysis of the Ba–BFO eMS spectra shows that the variation of the hyperfine field with temperature follows the Brillouin curve for S = 5/2.

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Section: Introductionmentioning

confidence: 96%

Temperature Dependence of the Hyperfine Magnetic Field at Fe Sites in Ba-Doped BiFeO3 Thin Films Studied by Emission Mössbauer Spectroscopy

et al. 2023

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“…Nonetheless, the primary drawback associated with the current photocatalysts lies in their wide band gap, deep trap states, rapid recombination of charge carriers, surface reconstruction, and nonreproducibility. , Furthermore, the synthesis conditions for these oxide-based photocatalysts are exceptionally harsh and time-consuming, necessitating high temperatures and pressures. − Hence, the synthesis process is energy-intensive and cost-ineffective. Consequently, due to these aforementioned limitations, the practical commercialization of these existing photocatalysts is unfeasible owing to their inefficient catalytic performances.…”

Section: Introductionmentioning

confidence: 99%

Lead-Free Halide Perovskites for Photocatalysis via High-Throughput Exploration

Dubey,

Sanchez,

Yang

et al. 2024

Chem. Mater.

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This Perspective navigates the transformative synergy between machine learning (ML) techniques and highthroughput (HT) methodologies in the realm of photocatalysis, aiming to overcome the inefficiencies and drawbacks associated with existing photocatalysts. Pb-free hybrid perovskite (HP) nanocrystals (NCs) emerge as promising candidates, offering distinctive physicochemical and optical attributes in addition to nontoxicity. The integration of HT automated methods accelerates the synthesis and characterization of novel Pb-free HP materials while also addressing challenges in obtaining large, high-quality data sets for training ML models. The proposed multidisciplinary approach, combining experimental and computational simulations, aims to unravel the complexities of photocatalytic systems, fostering the development of innovative strategies for materials development. The convergence of experimental techniques, computational simulations, and ML is poised to revolutionize photocatalysis (PC), propelling the field into an era of unprecedented discovery and innovation.

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“…Meanwhile, the relationship B hf = αM is usually linear for 57 Fe, 55 Mn, and 53 Cr nuclei, and the dependencies of the EFG tensor parameters V ii = f(P s ) and η = f ′ (P s ) (where η = (V XX − V YY )/V ZZ is the asymmetry parameter) demonstrate nontrivial behavior. In some works, quadratic dependences V ii = a + bP s 2 and η ∝ P s 2 are used for approximation [31][32][33]. However, such an approach is rather formal and does not allow for associating the hyperfine parameters of different resonant nuclei with the structural data and physical characteristics of the compounds under study.…”

Section: Introductionmentioning

confidence: 99%

Understanding Complex Interplay among Different Instabilities in Multiferroic BiMn7O12 Using 57Fe Probe Mössbauer Spectroscopy

Soboleva,

Nitsenko,

Sobolev

et al. 2024

IJMS

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Here, we report the results of a Mössbauer study on hyperfine electrical and magnetic interactions in quadruple perovskite BiMn7O12 doped with 57Fe probes. Measurements were performed in the temperature range of 10 K < T < 670 K, wherein BiMn6.9657Fe0.04O12 undergoes a cascade of structural (T1 ≈ 590 K, T2 ≈ 442 K, and T3 ≈ 240 K) and magnetic (TN1 ≈ 57 K, TN2 ≈ 50 K, and TN3 ≈ 24 K) phase transitions. The analysis of the electric field gradient (EFG) parameters, including the dipole contribution from Bi3+ ions, confirmed the presence of the local dipole moments pBi, which are randomly oriented in the paraelectric cubic phase (T > T1). The unusual behavior of the parameters of hyperfine interactions between T1 and T2 was attributed to the dynamic Jahn–Teller effect that leads to the softening of the orbital mode of Mn3+ ions. The parameters of the hyperfine interactions of 57Fe in the phases with non-zero spontaneous electrical polarization (Ps), including the P1 ↔ Im transition at T3, were analyzed. On the basis of the structural data and the quadrupole splitting Δ(T) derived from the 57Fe Mössbauer spectra, the algorithm, based on the Born effective charge model, is proposed to describe Ps(T) dependence. The Ps(T) dependence around the Im ↔ I2/m phase transition at T2 is analyzed using the effective field approach. Possible reasons for the complex relaxation behavior of the spectra in the magnetically ordered states (T < TN1) are also discussed.

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Temperature dependence of the local electromagnetic field at the Fe site in multiferroic bismuth ferrite

Cited by 7 publications

References 41 publications

Temperature Dependence of the Hyperfine Magnetic Field at Fe Sites in Ba-Doped BiFeO3 Thin Films Studied by Emission Mössbauer Spectroscopy

Temperature Dependence of the Hyperfine Magnetic Field at Fe Sites in Ba-Doped BiFeO3 Thin Films Studied by Emission Mössbauer Spectroscopy

Lead-Free Halide Perovskites for Photocatalysis via High-Throughput Exploration

Understanding Complex Interplay among Different Instabilities in Multiferroic BiMn7O12 Using 57Fe Probe Mössbauer Spectroscopy

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