Structure of magnetic amorphous alloys studied by energy dispersive X-ray diffraction

Egami, T.

doi:10.1063/1.327257

Cited by 41 publications

(3 citation statements)

References 33 publications

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“…In our case, the first peak in the PDF, which denotes the most probable nearest-neighbor distance in the structure, is centered at 2.55 Å and lies close to bulk bond length of Fe (2.482 Å) and Co (2.506 Å). It should be noted [52] that structural relaxation is not an incipient crystallization process, but that it is a transformation toward a more stable amorphous state driven by collective atomic motions of structural defects in which the nearest-neighbor distances and coordination numbers stay basically unchanged.…”

Section: Methodsmentioning

confidence: 99%

Atomic arrangements in an amorphous CoFeB ribbon extracted via an analysis of radial distribution functions

Pussi¹,

Barbiellini²,

Ohara³

et al. 2021

J. Phys.: Condens. Matter

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We discuss the atomic structure of amorphous ferromagnetic FeCoB alloys, which are used widely in spintronics applications. Specifically, we obtain the pair-distribution functions for various atomic pairs based on high-energy x-ray diffraction data taken from an amorphous Co 20 Fe 61 B 19 specimen. We start our reverse Monte Carlo cycles to determine the disordered structure with a two-phase model in which a small amount of cobalt is mixed with Fe 23 B 6 as a second phase. The structure of the alloy is found to be heterogeneous, where the boron atoms drive disorder through the random occupation of the atomic network. Our analysis also indicates the presence of small cobalt clusters that are embedded in the iron matrix and percolating the latter throughout the structure. This morphology can explain the enhanced spin polarization observed in amorphous magnetic materials.

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Section: Methodsmentioning

confidence: 99%

Atomic arrangements in an amorphous CoFeB ribbon extracted via an analysis of radial distribution functions

Pussi¹,

Barbiellini²,

Ohara³

et al. 2021

J. Phys.: Condens. Matter

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“…The energy dispersive X-ray diffraction (EDXD) technique has been chosen to study the aggregation aspect of TB samples because of the amorphous characteristics of this material. The angular dispersive X-ray diffraction (ADXD) technique also allows the study of amorphous samples by a molybdenum X-ray source, but the energy dispersive method has various advantages over the conventional angular dispersive method: the reduction of acquisition time of experimental data and the accessible region in the reciprocal space is wider. , The aim of this work is therefore to achieve more detailed information on the spatial organization and molecular interactions of toluidine blue in the solid phase, which proves to be crucial for chemical-physics properties.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Organization of Toluidine Blue Dye in Solid Amorphous Phases

et al. 2007

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Toluidine blue (TB) dye molecules are intensively utilized for large-area photophysics applications such as carcinoma detection, photoinactivation of bacteria, biosensors, and photovoltaic cells. Understanding the nature of the TB aggregation state becomes an essential point of the research process in order to know the structure-function relationship and to foresee technological applications of this class of metachromatic-dye molecules. However, no structural information on toluidine blue is available in the literature, maybe because of the poor crystalline character of the aggregate. Here, we present the first structural determination of TB organic molecules using the energy dispersive X-ray diffraction technique. The investigation highlights dimeric arrangements of stacked molecules in antiparallel fashion, forming a superstructure of two dimers in a transverse arrangement. The behavior of the TB higher aggregates indicates that these dye molecules, in spite of repulsion due to similar charge (cationic dyes), undergo self-aggregation to form helical conformations.

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“…EDXD allows one indeed to collect spectra in a much shorter time than the usual methods based on angular scanning, − thus giving structural information on the course of the heating ramp of a thermal investigation. In EDXD, a continuous polychromatic X-ray light is used and the diffracted beam is energy resolved by a solid state detector set at a suitable scattering angle.…”

Section: Introductionmentioning

confidence: 99%

DSC, FT-IR, and Energy Dispersive X-ray Diffraction Applied to the Study of the Glass Transition of Poly(p-phenylene sulfide)

et al. 1997

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The glass transition of poly(phenylene sulfide) (PPS) has been examined by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and energy dispersive X-ray diffraction (EDXD) techniques. All of them evidenced the α transition of the polymer, and the results obtained with the different techniques were found to be consistent when the onset point of the DSC trace is taken. The data were analyzed as a function of the rate of heating, and the activation energy of the phenomenon was calculated by assaying the theoretical model of Barton to fit the experimental data.

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Structure of magnetic amorphous alloys studied by energy dispersive X-ray diffraction

Cited by 41 publications

References 33 publications

Atomic arrangements in an amorphous CoFeB ribbon extracted via an analysis of radial distribution functions

Atomic arrangements in an amorphous CoFeB ribbon extracted via an analysis of radial distribution functions

Supramolecular Organization of Toluidine Blue Dye in Solid Amorphous Phases

DSC, FT-IR, and Energy Dispersive X-ray Diffraction Applied to the Study of the Glass Transition of Poly(p-phenylene sulfide)

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