Upgrade of beamline BL25SU for soft x-ray imaging and spectroscopy of solid using nano- and micro-focused beams at SPring-8

Senba, Yasunori; Ohashi, Haruhiko; Kotani, Yoshinori; Nakamura, Tetsuya; Matsuki, Takayuki; Ohkochi, Takuo; Tsuji, Naruki; Kishimoto, Hikaru; Miura, Takanori; Tanaka, Masayuki; Higashiyama, Masahiro; Takahashi, Sunao; Ishizawa, Yasuhide; Matsushita, Teruo; Furukawa, Yukito; Ohata, T.; Nariyama, Nobuteru; Takeshita, Kunikazu; Kinoshita, Toyohiko; Fujiwara, Akihiko; Takata, Masaki; Goto, Shunji

doi:10.1063/1.4952867

Cited by 43 publications

(18 citation statements)

References 6 publications

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“…The absorption signals were recorded with the soft x-ray absorption spectrometer on BL25SU [51][52][53][54], at the SPring-8 synchrotron, Japan, by means of the total electron yield (TEY) method. This apparatus is equipped with an electromagnet with a maximum applied magnetic field of μ 0 H ext = ±1.9 T, and a cryostat which can cool the sample down to 10 K. In this experiment, the energy resolution was set to E / E = 3000, where E is the Gaussian FWHM.…”

Section: E X-ray Absorption Measurementsmentioning

confidence: 99%

Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys

et al. 2020

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Magnetic Compton scattering, x-ray magnetic circular dichroism spectroscopy, and bulk magnetometry measurements are performed on a set of medium-(NiFeCo and NiFeCoCr) and high-entropy (NiFeCoCrPd and NiFeCoCrMn) Cantor-Wu alloys. The bulk spin momentum densities determined by magnetic Compton scattering are remarkably isotropic, and this is a consequence of the smearing of the electronic structure by disorder scattering of the electron quasiparticles. Nonzero x-ray magnetic circular dichroism signals are observed for every element in every alloy indicating differences in the populations of the majority and minority spin states implying finite magnetic moments. When Cr is included in the solid solution, the Cr spin moment is unambiguously antiparallel to the total magnetic moment, while a vanishingly small magnetic moment is observed for Mn, despite calculations indicating a large moment. Some significant discrepancies are observed between the experimental bulk and surface magnetic moments. Despite the lack of quantitative agreement, the element-specific surface magnetic moments seem to be qualitatively reasonable.

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Section: E X-ray Absorption Measurementsmentioning

confidence: 99%

Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys

et al. 2020

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“…The graphite single crystal was cleaved and degassed in an ultrahigh vacuum chamber. The C 1 s PIAD patterns from the graphite crystal surface were measured using DIANA at the circularly polarized soft X‐ray beamline BL25SU of SPring‐8, Japan . The details of PIAD data processing are described elsewhere .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The C 1s PIAD patterns from the graphite crystal surface were measured using DIANA 3,6 at the circularly polarized soft X-ray beamline BL25SU of SPring-8, Japan. [7][8][9] The details of PIAD data processing are described elsewhere. 10 The acceptance solid angle of the analyzer was 1 steradian (±60 • ).…”

Section: Experimental Methodsmentioning

confidence: 99%

Mapping nanometer and micrometer‐scale structures at graphite surface by photoelectron diffraction

Fujita

Ōta

Matsushita

et al. 2018

Surface & Interface Analysis

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A series of C 1s photoelectron intensity angular distribution (PIAD) patterns from a crystalline graphite surface were mapped in two dimensions at intervals of 20 μm. Two kinds of PIAD patterns rotated by 30° from each other, corresponding to the two domains from the twinned crystal, were found. The standard deviation of the diffraction contrast was evaluated for each PIAD pattern from its intensity histogram. Surprisingly, we found that odd‐number‐ (most probably single‐) atom‐height steps on the flat terrace region and their local atomic arrangement can be identified by two‐dimensionally mapping the standard deviation values. Furthermore, we analyzed the photoelectron diffraction patterns and noticed that the normal direction of the sample surface at each point was slightly inclined differently. By connecting all the inclination angle data, the micrometer‐scale corrugation of the sample surface was successfully visualized. Scanning photoelectron diffraction microscopy has been shown to be useful for the nanometer‐ and micrometer‐scale structural imaging.

show abstract

“…The absorption signals were recorded with the soft xray absorption spectrometer on BL25SU [51][52][53][54], at the SPring-8 synchrotron, Japan, by means of the total electron yield (TEY) method. This apparatus is equipped with an electromagnet with a maximum applied magnetic field of µ 0 H ext = ±1.9 T, and a cryostat which can cool the sample down to 10 K. In this experiment, the energy resolution was set to E/∆E = 3000, where ∆E is the Gaussian FWHM.…”

Section: E X-ray Absorption Measurementsmentioning

confidence: 99%

Bulk and element specific magnetism of the medium and high entropy Cantor-Wu alloys

Billington,

James,

Harris-Lee

et al. 2020

Preprint

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Magnetic Compton scattering, x-ray magnetic circular dichroism spectroscopy and bulk magnetometry measurements are performed on a set of medium (NiFeCo and NiFeCoCr) and high (NiFeCoCrPd and NiFeCoCrMn) entropy Cantor-Wu alloys. The bulk spin momentum densities determined by magnetic Compton scattering are remarkably isotropic, and this is a consequence of the smearing of the electronic structure by disorder scattering of the electron quasiparticles. Nonzero x-ray magnetic circular dichroism signals are observed for every element in every alloy indicating differences in the populations of the majority and minority spin states implying finite magnetic moments. When Cr is included in the solid solution, the Cr spin moment is unambiguously antiparallel to the total magnetic moment, while a vanishingly small magnetic moment is observed for Mn, despite calculations indicating a large moment. Some significant discrepancies are observed between the experimental bulk and surface magnetic moments. Despite the lack of quantitative agreement, the element specific surface magnetic moments seem to be qualitatively reasonable.

show abstract

Upgrade of beamline BL25SU for soft x-ray imaging and spectroscopy of solid using nano- and micro-focused beams at SPring-8

Cited by 43 publications

References 6 publications

Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys

Bulk and element-specific magnetism of medium-entropy and high-entropy Cantor-Wu alloys

Mapping nanometer and micrometer‐scale structures at graphite surface by photoelectron diffraction

Bulk and element specific magnetism of the medium and high entropy Cantor-Wu alloys

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