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Journal Articles

Depth profile analysis of multi-layer laminated thin film interface by spatiotemporal angle-resolved APXPS method

Toyoda, Satoshi*; Yoshimura, Masashi*; Sumida, Hirosuke*; Mineoi, Susumu*; Machida, Masatake*; Yoshigoe, Akitaka; Yoshikawa, Akira*; Suzuki, Satoru*; Yokoyama, Kazushi*

Hoshako, 35(3), p.200 - 206, 2022/05

The present status of spatiotemporal depth profiling analysis of the multilayer stacked film interface based on Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS) is presented. To begin with, depth profiles of the multilayer stacked film interfaces have been achieved by time-division Near Ambient Pressure Hard X-ray Angle-Resolved PhotoEmission Spectroscopy data. We then have promoted our methods to quickly perform peak fittings and depth profiling from time-division angle resolved AP-XPS data including spatial resolution, which enables us to realize spatiotemporal depth profiles of the interfaces under reaction conditions such as oxidation and reduction. In addition, it is found that the traditional maximum entropy method (MEM) combined with Jackknife averaging of sparse modeling is effective to perform dynamic measurement of depth profiles with high precision.

Journal Articles

Development of ${it spatiotemporal}$ measurement and analysis techniques in X-ray photoelectron spectroscopy; From NAP-HARPES to 4D-XPS

Toyoda, Satoshi*; Yamamoto, Tomoki*; Yoshimura, Masashi*; Sumida, Hirosuke*; Mineoi, Susumu*; Machida, Masatake*; Yoshigoe, Akitaka; Suzuki, Satoru*; Yokoyama, Kazushi*; Ohashi, Yuji*; et al.

Vacuum and Surface Science, 64(2), p.86 - 91, 2021/02

https://doi.org/10.1380/vss.64.86

We have developed ${it spatiotemporal}$ measurement and analysis techniques in X-ray photoelectron spectroscopy. To begin with, time-division depth profiles of gate stacked film interfaces have been achieved by NAP-HARPES (Near Ambient Pressure Hard X-ray Angle-Resolved Photo Emission Spectroscopy) data. We then have promoted our methods to quickly perform peak fittings and depth profiling from time-division ARPES data, which enables us to realize 4D-XPS analysis. It is found that the traditional maximum entropy method (MEM) combined with Jackknife averaging of sparse modeling in NAP-HARPES data is effective to perform dynamic measurement of depth profiles with high precision.

Journal Articles

Local structure study of the iron-based systems of BaFe$$_2$$As$$_2$$ and LiFeAs by X-ray PDF and XAFS analyses

Li, S.*; Toyoda, Masayuki*; Kobayashi, Yoshiaki*; Ito, Masayuki*; Ikeuchi, Kazuhiko*; Yoneda, Yasuhiro; Otani, Akira*; Matsumura, Daiju; Asano, Shun*; Mizuki, Junichiro*; et al.

Physica C, 555, p.45 - 53, 2018/12

https://doi.org/10.1016/j.physc.2018.10.003
 Times Cited Count：1 Percentile：5.02(Physics, Applied)

${it T}$-dependence of local distortions in BaFe$$_2$$As$$_2$$ and LiFeAs by X-ray PDF and XAFS methods. Although PDF data exhibit anomaly at the structure transition temperature, EXAFS data exhibit no anomaly. Data supporting the local orthorhombicity at 300 K in the tetragonal phase for BaFe$$_2$$As$$_2$$. Arguments on the origins of the 4-fold symmetry breaking in the ground average structure of the tetragonal phase.

JAEA Reports

None

Ebana, Minoru; Noda, Kimio; Kobayashi, Hirohide; Soma, Susumu; Mikami, Satoshi; Toyoda, Motoko; Oyanagi, Katsumi*

PNC TN8410 98-075, 36 Pages, 1998/07

PNC-TN8410-98-075.pdf:1.34MB

None

Oral presentation

Involvement of carotenoid cleavage dioxigenase (${it CmCCD4a}$) in flower color mutation of "Jimba"

Omiya, Akemi*; Toyoda, Tomomi*; Watanabe, Hideki*; Enomoto, Keishi*; Hase, Yoshihiro; Yoshioka, Satoshi*

no journal, , 

no abstracts in English

Oral presentation

Site preference and magnetic structural study on BaTiMnFe$$_{10}$$O$$_{19}$$ by neutron and X-ray diffraction

Takayasu, Shunichi*; Yoshizaki, Jumpei*; Okube, Maki*; Toyoda, Takeshi*; Igawa, Naoki; Sasaki, Satoshi*

no journal, , 

Hexagonal barium ferrites have been traditionally used as permanent magnets and microwave devices because of their high coercivity and large uniaxial anisotropy. It is recognized that the magnetic anisotropy can be optimized by Fe$$^{3+}$$ ion for several magnetic and non-magnetic ions, which makes M-type ferrites suitable for microwave absorber in 1 - 75 GHz range. In this study to use neutron and X-ray powder diffraction, site preference and magnetic structure of iron sites on BaTiCoFe$$_{10}$$O$$_{19}$$ are examined.

Oral presentation

Site preference and magnetic structure of M-type BaTiMnFe$$_{10}$$O$$_{19}$$ ferrite determined by X-ray and neutron diffraction methods

Takayasu, Shunichi*; Yoshizaki, Jumpei*; Okube, Maki*; Toyoda, Takeshi*; Igawa, Naoki; Sasaki, Satoshi*

no journal, , 

Site preferences of Ti and Mn and the magnetic structure of M-type BaTiMnFe$$_{10}$$O$$_{19}$$ ferrite were analyzed using the X rays and neutron powder diffraction method. The intensity difference on the magnetic scattering was clearly observed below and above the ${it T}$c, showing the ferrimagnetic spin arrangement along with the ${it c}$ axis. Site-occupancy refinements give the results that Ti ions occupy the 4${it f}$1 (24%), 2${it a}$ (15%) and 2${it b}$ (15%) sites, while Mn ions prefer to 4${it f}$2 (24%) and 12${it k}$ (24%). Magnetic moments were obtained from the Rietveld refinements, which are 3.56, 3.37, -3.86, -3.72 and 3.68 $$mu$$$$_{B}$$ at ${it T}$ = 8 K for 2${it a}$, 2${it b}$, 4${it f}$1, 4${it f}$2 and 12${it k}$ sites, respectively.

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