Peculiar magnetism of BiFeO3 nanoparticles with size approaching the period of the spiral spin structure

Huang, Fengzhen; Wang, Zhijun; Lü, Xiaomei; Zhang, Junting; Min, Kangli; Lin, Weiwei; Ti, Ruixia; Xu, Tingting; He, Jun; Chen, Yue; Zhu, Jinsong

doi:10.1038/srep02907

Cited by 246 publications

(172 citation statements)

References 44 publications

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“…In figure 1(c) the susceptibility measurement is shown as a function of temperature. Two prominent transitions have been observed at 56 K and 24 K. The broad feature at 56 K can be attributed to the magnetic blocking effect induced by the competition between thermal energy and magnetic anisotropy energy due to the presence of magnetic clusters (introduced by the disorders) in the system (marked as T B in figure 1(c)) [35]. The transition at 24 K is relatively sharp which could be related to the SG freezing temperature (marked as T F in figure 1(c)) or some other magnetic impurity phase.…”

Section: Resultsmentioning

confidence: 98%

Electronic structure of FeAl alloy studied by resonant photoemission spectroscopy and Ab initio calculations

Mondal

Banik

Kamal

et al. 2016

Journal of Alloys and Compounds

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Abstract. Resonant photoemission spectroscopy has been used to investigate the character of Fe 3d states in FeAl alloy. Fe 3d states have two different character, first is of itinerant nature located very close to the Fermi level, and second, is of less itinerant (relatively localized character), located beyond ∼2 eV below the Fermi level. These distinct states are clearly distinguishable in the resonant photoemission data. Comparison between the results obtained from experiments and first principle based electronic structure calculation show that the origin of the itinerant character of the Fe 3d states is due to the ordered B2 structure, whereas the relatively less itinerant (localized) Fe 3d states are from the disorders present in the sample. The exchange splitting of the Fe 3s core level peak confirms the presence of local moment in this system. It is found that the itinerant electrons arise due to the hybridization between Fe 3d and Al 3s − 3p states. Presence of hybridization is observed as a shift in the Al 2p core-level spectra as well as in the X-ray near edge absorption spectra towards lower binding energy. Our photoemission results are thus explained by the co-existence of ordered and disordered phases in the system.

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Section: Resultsmentioning

confidence: 98%

Electronic structure of FeAl alloy studied by resonant photoemission spectroscopy and Ab initio calculations

Mondal

Banik

Kamal

et al. 2016

Journal of Alloys and Compounds

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“…8,14,15 Besides, recent investigations have demonstrated enhanced magnetization in BFO nanostructures with sizes less than 62 nm by virtue of its modified spiral spin structure. [11][12][13] The effect of doping concentration on multiferroic properties of both bulk and nanocrystalline Ba-doped BFO ceramic materials were reported in Refs. [16][17][18].…”

Section: -2mentioning

confidence: 99%

Size dependent magnetic and electrical properties of Ba-doped nanocrystalline BiFeO3

et al. 2016

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Improvement in magnetic and electrical properties of multiferroic BiFeO3 in conjunction with their dependence on particle size is crucial due to its potential applications in multifunctional miniaturized devices. In this investigation, we report a study on particle size dependent structural, magnetic and electrical properties of sol-gel derived Bi0.9Ba0.1FeO3 nanoparticles of different sizes ranging from ∼ 12 to 49 nm. The substitution of Bi by Ba significantly suppresses oxygen vacancies, reduces leakage current density and Fe 2+ state. An improvement in both magnetic and electrical properties is observed for 10 % Ba-doped BiFeO3 nanoparticles compared to its undoped counterpart. The saturation magnetization of Bi0.9Ba0.1FeO3 nanoparticles increase with reducing particle size in contrast with a decreasing trend of ferroelectric polarization. Moreover, a first order metamagnetic transition is noticed for ∼ 49 nm Bi0.9Ba0.1FeO3 nanoparticles which disappeared with decreasing particle size. The observed strong size dependent multiferroic properties are attributed to the complex interaction between vacancy induced crystallographic defects, multiple valence states of Fe, uncompensated surface spins, crystallographic distortion and suppression of spiral spin cycloid of BiFeO3.

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“…Thus, one way to avoid its AFM is to suppress the formation of the helicoidally spin array, synthesizing, for example, nanoparticles with diameters lower than the period length [19][20][21][22][23], substituting the Bi sites for alkaline earth metals (Ba, Ca or Sr) [24] or the Fe ions for Co ions [25]. In this regard, the electrospinning of nanofibers of BiFeO 3 seems to have the potential to produce nanostructures with improved mag-netic properties [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

Melo¹,

Santos²,

Gualdi³

et al. 2017

Electrospinning

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BiFeO 3 nanofibers of different morphologies and dimensions were produced by electrospinning varying the collector and thermal treatment. By thermogravimetric analyses (TGA) the thermal behavior of the as-spun nanofibers was studied. The morphology of the nanofibers was examined by transmission and scanning electron microscopy (TEM and SEM, respectively) while the chemical composition and crystal structure were analyzed by energy dispersive x-ray spectrometry (EDS) and wide angle x-ray diffraction (WAXD). A vibrating sample magnetometer (VSM) was used to evaluate the magnetic properties. Different types of mats with different nanofibers´dimen-sions were obtained; while some nanofibers were interconnected, others were completely separated and aligned. The thinnest nanofibers were obtained using an aluminum substrate with folds and after annealing at 550 ∘ C. All samples annealed at this temperature formed pure BiFeO 3 , while samples annealed at 550 and 750 ∘ C formed an additional Bi 2 Fe 4 O 9 phase. No iron impurities were detected; the crystallite size of all the nanofibers was between 30 and 36 nm. The saturation magnetization increased with the decrease of the nanofiber´s diameter and increase of nanofibers interconnectivity. Thus, this ferromagnetism behavior was attributed to the suppression of the spiral spin structure of BiFeO 3 (which has a 62 nm period) and to the morphology of interconnected nanofibers.

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Peculiar magnetism of BiFeO3 nanoparticles with size approaching the period of the spiral spin structure

Cited by 246 publications

References 44 publications

Electronic structure of FeAl alloy studied by resonant photoemission spectroscopy and Ab initio calculations

Electronic structure of FeAl alloy studied by resonant photoemission spectroscopy and Ab initio calculations

Size dependent magnetic and electrical properties of Ba-doped nanocrystalline BiFeO3

Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

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