Electron spin resonance probed suppressing of the cycloidal spin structure in doped bismuth ferrites

Lin, J. W.; Tang, Y. H.; Lue, Chin‐Shan; Lin, J. G.

doi:10.1063/1.3451463

Cited by 36 publications

(9 citation statements)

References 11 publications

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“…The LF resonance with g -factor near 4 has a characteristic of magnetically isolated high spin Fe 3+ ( S = 5/2) in a low symmetric environment, which corresponds to the defect complexes, e.g., defect dipoles. On the other hands, the HF resonance with g -factor close to 2 can be ascribed to the Fe ions and is correlated with the resonant absorption in the cycloidal spin structure and the defect induced free spins2930. Furthermore, a striking absorption splits into two peaks in the Mn-doped BFO spectra, indicating that the magnetic environment for the unpaired electrons in Fe ions has significantly changed due to the Mn ion substitution and the existence of Fe 3+ -exchange-coupled magnetic secondary phase3132.…”

Section: Resultsmentioning

confidence: 93%

Tailoring surface phase transition and magnetic behaviors in BiFeO3 via doping engineering

Yan

Xing

Wang

et al. 2015

Sci Rep

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The charge-spin interactions in multiferroic materials (e.g., BiFeO3) have attracted enormous attention due to their high potential for next generation information electronics. However, the weak and deficient manipulation of charge-spin coupling notoriously limits their commercial applications. To tailor the spontaneous charge and the spin orientation synergistically in BiFeO3 (BFO), in this report, the 3d element of Mn doping engineering is employed and unveils the variation of surface phase transition and magnetic behaviors by introducing chemical strain. The spontaneous ferroelectric response and the corresponding domain structures, magnetic behaviors and spin dynamics in Mn-doped BFO ceramics have been investigated systematically. Both the surface phase transition and magnetization were enhanced in BFO via Mn doping. The interaction between the spontaneous polarization charge and magnetic spin reorientation in Mn-doped BFO are discussed in detail. Moreover, our extensive electron paramagnetic resonance (EPR) results demonstrate that the 3d dopant plays a paramount role in the surface phase transition, which provides an alternative route to tune the charge-spin interactions in multiferroic materials.

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Section: Resultsmentioning

confidence: 93%

Tailoring surface phase transition and magnetic behaviors in BiFeO3 via doping engineering

Yan

Xing

Wang

et al. 2015

Sci Rep

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“…In addition, ESR results gave further evidence for the FM properties of the samples (S1–S4), all samples were performed under the same instrument parameters. ESR is an extremely powerful tool to test magnetic excitation spectra in solids, providing important information on a magnetic structure and main parameters of the effective spin Hamiltonian . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Synthesis and Magnetic Properties of Bismuth Ferrites Nanocrystals with Various Morphology

Dong

Chen

et al. 2012

J. Am. Ceram. Soc.

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The effects of processing parameters on phase formation of hydrothermally synthesized bismuth ferrites were investigated. Bi 25 FeO 40 , BiFeO 3 , and Bi 2 Fe 4 O 9 with different morphologies and grain size were synthesized by dissolving bismuth nitrate and iron nitrate in KOH solution at reaction time ranging from 3 to 20 h. The subcrystallized part of BiFeO 3 obtained with reaction time of 4 and 5 h displayed strong saturation magnetization of~2.914 emu/g. The results of the electron spin resonance (ESR) indicated each unpaired spin providing a net magnetic moment which eventually led to the enhancement of the saturated magnetization. Furthermore, Zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves exhibited spin-glass freezing behavior in all the samples. And the lowtemperature magnetic hysteresis loop displayed the ferromagnetism of BiFeO 3 with different structures and the phenomenon of exchange bias, respectively.

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“…Resonances are due to Fe ions in different local environments, marked as Fe 3+ and Fe 3+ ‐ 2 V(O). The broad resonance, centered at 3350 G, is attributed by Lin et al18 to the cycloidal spin structure, i.e., “normal” Fe 3+ sites in the BFO lattice. After treatment, the Fe 3+ ‐ 2 V(O) line is significantly enhanced indicating that new oxygen vacancies were created.…”

Section: Resultsmentioning

confidence: 96%

Chiral Diaminopyrrolic Receptors for Selective Recognition of Mannosides, Part 1: Design, Synthesis, and Affinities of Second‐Generation Tripodal Receptors

Nativi

Francesconi

Gabrielli

et al. 2011

Chemistry A European J

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A new generation of chiral tripodal receptors for recognition of carbohydrates, featuring trans-1,2-diaminocyclohexane as a key structural element, and their recognition properties toward a set of glycosides of biologically relevant monosaccharides is described. The introduction of a chelating diamino unit into the pyrrolic tripodal architecture markedly enhanced their binding abilities compared with the parent aminopyrrolic receptors previously reported by our group. In addition, the chirality of the structure had a clear impact on affinities, as well as on selectivities, displaying high enantiodiscrimination levels. These second-generation diaminopyrrolic tripodal receptors are highly selective for mannose among other monosaccharides, with two members of the family being selective for the α and the β anomers respectively. The measured affinities in acetonitrile, 83 μM of (S)-7 for the β mannoside and 127 μM of (R)-5 for the α mannoside, make them the most effective synthetic receptors for mannosides reported to date. The affinity assessment required a further evolution of the BC(0)(50) parameter, a previously developed binding descriptor, which in its ultimate formulation has now been extended to include, with no restrictions, complexes of any stoichiometry, and can thus be generally employed to rank affinity data from heterogeneous systems on a common scale.

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Electron spin resonance probed suppressing of the cycloidal spin structure in doped bismuth ferrites

Cited by 36 publications

References 11 publications

Tailoring surface phase transition and magnetic behaviors in BiFeO3 via doping engineering

Tailoring surface phase transition and magnetic behaviors in BiFeO3 via doping engineering

Hydrothermal Synthesis and Magnetic Properties of Bismuth Ferrites Nanocrystals with Various Morphology

Chiral Diaminopyrrolic Receptors for Selective Recognition of Mannosides, Part 1: Design, Synthesis, and Affinities of Second‐Generation Tripodal Receptors

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