Journal ArticleDOI
Effect of Microstrain on the Magnetic Properties of BiFeO3 Nanoparticles
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TLDR
In this article, the size induced microstrain-dependent magnetic properties of BiFeO3 nanoparticles were investigated and it was found that the micro-strain is high (e.g., 0.3%) for smaller crystallite sizes and shows a sharp decrease as the particle size increases.Abstract:
We report on size induced microstrain-dependent magnetic properties of BiFeO3 nanoparticles. The microstrain is found to be high (e > 0.3%) for smaller crystallite sizes (d < 30 nm), and shows a sharp decrease as the particle size increases. The presence of pseudo-cubic symmetry is evidenced for these nanoparticles. Raman spectral studies suggest straightening of the Fe-O-Fe bond angle accompanied by a decrease in FeO6 octahedral rotation for d < 65 nm. The magnetization shows a dip around 30 nm, half the size of spin cycloid length for BiFeO3, due to a decrease in rhombohedral distortion with crystallite size. We also observe a similar trend in the TN with respect to size indicating that the microstrain plays a significant role in controlling the magnetic property of BiFeO3.read more
Citations
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Journal ArticleDOI
Nonmonotonic particle-size-dependence of magnetoelectric coupling in strained nanosized particles of BiFeO 3 .
Sudipta Goswami,Dipten Bhattacharya,Chandan Kumar Ghosh,Barnali Ghosh,S. D. Kaushik,Vasudeva Siruguri,P. S. R. Krishna +6 more
TL;DR: Competition between enhanced lattice strain and compressive pressure appears to be causing the nonmonotonic particle-size-dependence of off-centre displacement while coupling between piezo and magnetostriction leads to nonmonotonicity in the variation of magnetoelectric coupling.
Journal ArticleDOI
Temperature-dependent Structural and Spectroscopic Studies of (Bi1–xFex)FeO3
Andrea Kirsch,M. Mangir Murshed,Melanie J. Kirkham,Ashfia Huq,F. Jochen Litterst,Thorsten M. Gesing +5 more
TL;DR: In this article, temperature-dependent structural and spectroscopic features of (Bi1−xFex)FeO3 perovskite for x = 0.15 and 0.25 were reported.
Journal ArticleDOI
A novel bentonite–cobalt doped bismuth ferrite nanoparticles with boosted visible light induced photodegradation of methyl orange: synthesis, characterization and analysis of physiochemical changes
Muhammad Jamshaid,H. Khan,Muhammad Altaf Nazir,Muhammad Ahmad Wattoo,Khuram Shahzad,Misbah Malik,Aziz-ur Rehman +6 more
TL;DR: In this article , a detailed analysis of the structural, magnetic, electric and visible light-driven photocatalytic properties of bentonite-cobalt-doped multiferroic bismuth ferrite (BFO) nanoparticles was performed.
Journal ArticleDOI
Oxygen vacancy induced photoconductivity enhancement in Bi 1-x Ca x FeO 3-δ nanoparticle ceramics: A combined experimental and theoretical study
TL;DR: Based on experimental and density functional studies, the authors showed that tailoring of oxygen vacancies (OV) leads to large scale enhancement of photoconductivity in BiFeO3 (BFO).
Journal ArticleDOI
Nonmonotonic particle-size-dependence of magnetoelectric coupling in strained nanosized particles of BiFeO$_3$
Sudipta Goswami,Dipten Bhattacharya,Chandan Kumar Ghosh,Barnali Ghosh,S. D. Kaushik,Vasudeva Siruguri,P. S. R. Krishna +6 more
TL;DR: In this article, the off-centered displacement of the ions and magnetoelectric coupling exhibit non-monotonic variation with particle size and increase as the particle size reduces from bulk and reach maximum around 30 nm.
References
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Journal ArticleDOI
Epitaxial BiFeO3 multiferroic thin film heterostructures.
Jian Wang,Jeffrey B. Neaton,Haimei Zheng,Valanoor Nagarajan,Satishchandra Ogale,B. T. Liu,Dwight Viehland,V. Vaithyanathan,Darrell G. Schlom,Umesh V. Waghmare,Nicola A. Spaldin,Karin M. Rabe,Manfred Wuttig,Ramamoorthy Ramesh +13 more
TL;DR: Enhanced polarization and related properties in heteroepitaxially constrained thin films of the ferroelectromagnet, BiFeO3, and combined functional responses in thin film form present an opportunity to create and implement thin film devices that actively couple the magnetic and ferroelectric order parameters.
Journal ArticleDOI
Revival of the Magnetoelectric Effect
Abstract: Recent research activities on the linear magnetoelectric (ME) effect?induction of magnetization by an electric field or of polarization by a magnetic field?are reviewed. Beginning with a brief summary of the history of the ME effect since its prediction in 1894, the paper focuses on the present revival of the effect. Two major sources for 'large' ME effects are identified. (i) In composite materials the ME effect is generated as a product property of a magnetostrictive and a piezoelectric compound. A linear ME polarization is induced by a weak ac magnetic field oscillating in the presence of a strong dc bias field. The ME effect is large if the ME coefficient coupling the magnetic and electric fields is large. Experiments on sintered granular composites and on laminated layers of the constituents as well as theories on the interaction between the constituents are described. In the vicinity of electromechanical resonances a ME voltage coefficient of up to 90?V?cm?1?Oe?1 is achieved, which exceeds the ME response of single-phase compounds by 3?5 orders of magnitude. Microwave devices, sensors, transducers and heterogeneous read/write devices are among the suggested technical implementations of the composite ME effect. (ii) In multiferroics the internal magnetic and/or electric fields are enhanced by the presence of multiple long-range ordering. The ME effect is strong enough to trigger magnetic or electrical phase transitions. ME effects in multiferroics are thus 'large' if the corresponding contribution to the free energy is large. Clamped ME switching of electrical and magnetic domains, ferroelectric reorientation induced by applied magnetic fields and induction of ferromagnetic ordering in applied electric fields were observed. Mechanisms favouring multiferroicity are summarized, and multiferroics in reduced dimensions are discussed. In addition to composites and multiferroics, novel and exotic manifestations of ME behaviour are investigated. This includes (i) optical second harmonic generation as a tool to study magnetic, electrical and ME properties in one setup and with access to domain structures; (ii) ME effects in colossal magnetoresistive manganites, superconductors and phosphates of the LiMPO4 type; (iii) the concept of the toroidal moment as manifestation of a ME dipole moment; (iv) pronounced ME effects in photonic crystals with a possibility of electromagnetic unidirectionality. The review concludes with a summary and an outlook to the future development of magnetoelectrics research.
Journal ArticleDOI
Spiral magnetic ordering in bismuth ferrite
TL;DR: In this article, the magnetic ordering of the iron ions in bismuth ferrite BiFeO3 was obtained by a study with a high-resolution time-of-flight neutron diffractometer.
Journal ArticleDOI
Size-Dependent Magnetic Properties of Single-Crystalline Multiferroic BiFeO3 Nanoparticles
Tae-Jin Park,Georgia C. Papaefthymiou,Arthur J. Viescas,and Arnold R. Moodenbaugh,Stanislaus S. Wong +4 more
TL;DR: As-prepared, single-crystalline bismuth ferrite nanoparticles show strong size-dependent magnetic properties that correlate with increased suppression of the known spiral spin structure with decreasing nanoparticle size and uncompensated spins and strain anisotropies at the surface.
Journal ArticleDOI
Raman study of magnetite (Fe3O4): laser‐induced thermal effects and oxidation
Olga Shebanova,Peter Lazor +1 more
TL;DR: In this article, the correlation between the power of the excitation laser, the temperature of the sampled spot and the degree of oxidation of magnetite was accurately established, and three independent methods based on the quasi-harmonic approximation and on the ratio of the Stokes to anti-Stokes intensities were used to calculate the local temperature.
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