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Journal Articles

Magnetic patterning of FeRh thin films by energetic light ion microbeam irradiation

Koide, Tetsuya*; Sato, Takahiro; Koka, Masashi; Saito, Yuichi; Kamiya, Tomihiro; Okochi, Takuo*; Kotsugi, Masato*; Kinoshita, Toyohiko*; Nakamura, Tetsuya*; Iwase, Akihiro*; et al.

Japanese Journal of Applied Physics, 53(5S1), p.05FC06_1 - 05FC06_4, 2014/05

 Times Cited Count:9 Percentile:41.81(Physics, Applied)

We previously reported that the magnetic state of FeRh can be controlled by irradiation with ion beams. In this paper, we evaluate possibility of magnetic patterning on FeRh thin films using energetic light ion microbeam irradiation with various shapes and dimensions. Proton microbeam irradiation with 2 MeV was performed at JAEA-Takasaki to produce micron-sized magnetic patterns. XMCD-PEEM observation was performed at SPring8 to confirm the synthesized magnetic patterns. As a result, the XMCD-PEEM images of the various micrometer sized patters in FeRh film were observed using 2 MeV H ion beam. The observed bright regions are considered to have ferromagnetic spin orders, in contrast that the gray areas have anti-ferromagnetic spin order. Since the brightness of the PEEM images is strongly correlated with the magnetization of the samples, we reveal that the magnetic state in local regions of the FeRh thin films can be controlled by changing the ion fluences.

Journal Articles

Study on ferromagnetic ordering of FeRh thin films induced by energetic heavy ion irradiation by means of X-ray magnetic circular dichroism

Aiko, Kazuma*; Toki, Atsushi*; Okuda, Shuichi*; Saito, Yuichi; Kamiya, Tomihiro; Nakamura, Tetsuya*; Kinoshita, Toyohiko*; Iwase, Akihiro*; Matsui, Toshiyuki*

Nuclear Instruments and Methods in Physics Research B, 314, p.99 - 102, 2013/11

 Times Cited Count:3 Percentile:28.44(Instruments & Instrumentation)

Journal Articles

Epitaxy of graphene on 3C-SiC(111) thin films on microfabricated Si(111) substrates

Ide, Takayuki*; Kawai, Yusuke*; Handa, Hiroyuki*; Fukidome, Hirokazu*; Kotsugi, Masato*; Okochi, Takuo*; Enta, Yoshiharu*; Kinoshita, Toyohiko*; Yoshigoe, Akitaka; Teraoka, Yuden; et al.

Japanese Journal of Applied Physics, 51(6), p.06FD02_1 - 06FD02_4, 2012/06

 Times Cited Count:7 Percentile:32.63(Physics, Applied)

Journal Articles

MFM and PEEM observation of micrometre-sized magnetic dot arrays fabricated by ion-microbeam irradiation in FeRh thin films

Aiko, Kazuma*; Toki, Atsushi*; Matsui, Toshiyuki*; Iwase, Akihiro*; Sato, Takahiro; Takano, Katsuyoshi*; Koka, Masashi; Saito, Yuichi; Kamiya, Tomihiro; Okochi, Takuo*; et al.

Journal of Synchrotron Radiation, 19(2), p.223 - 226, 2012/03

 Times Cited Count:6 Percentile:34.62(Instruments & Instrumentation)

Journal Articles

Controls over structural and electronic properties of epitaxial graphene on silicon using surface termination of 3C-SiC(111)/Si

Fukidome, Hirokazu*; Abe, Shunsuke*; Takahashi, Ryota*; Imaizumi, Kei*; Inomata, Shuya*; Handa, Hiroyuki*; Saito, Eiji*; Enta, Yoshiharu*; Yoshigoe, Akitaka; Teraoka, Yuden; et al.

Applied Physics Express, 4(11), p.115104_1 - 115104_3, 2011/11

 Times Cited Count:34 Percentile:79.73(Physics, Applied)

Journal Articles

Control of epitaxy of graphene by crystallographic orientation of a Si substrate toward device applications

Fukidome, Hirokazu*; Takahashi, Ryota*; Abe, Shunsuke*; Imaizumi, Kei*; Handa, Hiroyuki*; Kang, H. C.*; Karasawa, Hiromi*; Suemitsu, Tetsuya*; Otsuji, Taiichi*; Enta, Yoshiharu*; et al.

Journal of Materials Chemistry, 21(43), p.17242 - 17248, 2011/11

 Times Cited Count:28 Percentile:66.17(Chemistry, Physical)

Journal Articles

Electronic structure of aluminium trihydride studied using soft X-ray emission and absorption spectroscopy

Takeda, Yukiharu; Saito, Yuji; Saito, Hiroyuki; Machida, Akihiko; Aoki, Katsutoshi; Yamagami, Hiroshi; Muro, Takayuki*; Kato, Yukako*; Kinoshita, Toyohiko*

Physical Review B, 84(15), p.153102_1 - 153102_4, 2011/10

 Times Cited Count:7 Percentile:34.63(Materials Science, Multidisciplinary)

We have performed soft X-ray emission spectroscopy (SXES) and soft X-ray absorption spectroscopy (SXAS) experiments on aluminum hydride $${alpha}$$-AlH$$_{3}$$. The occupied and unoccupied electronic states of the Al 3$$p$$ partial density of states are obtained experimentally. By comparing the data from Al metal and $${alpha}$$-AlH$$_{3}$$, a band gap with a few eV is found for $${alpha}$$-AlH$$_{3}$$. In addition, the occupied states of $${alpha}$$-AlH$$_{3}$$ have a larger spectral intensity than that of Al metal, indicating an increase in the number of electrons with the Al 3$$p$$ character through Al-H bond formations. The results of a band-structure calculation account for the formation of the energy gap and the increase of the Al 3$$p$$ electrons qualitatively. This suggests that a covalent-like nature is important to the Al-H bond in $${alpha}$$-AlH$$_{3}$$.

Journal Articles

Electronic structure of lithium amide

Kamakura, Nozomu; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Tsubota, Masami*; Paik, B.*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; Muro, Takayuki*; Kato, Yukako*; et al.

Physical Review B, 83(3), p.033103_1 - 033103_4, 2011/01

 Times Cited Count:5 Percentile:26.71(Materials Science, Multidisciplinary)

The electronic structure of lithium amide, which is lightweight complex hydride expected as a high-capacity hydrogen storage material, is investigated by N 1$$s$$ soft X-ray emission spectroscopy (XES) and absorption spectroscopy (XAS). The overall feature of the electronic structure of lithium amide by the XES and XAS is consistent with the band calculation, while the strongly hybridized state with H 1$$s$$ is located at higher binding energy than the band calculation.

Journal Articles

Photoemission and ion-scattering study of Ce/Ni(110) and Ce/Cu(110) systems

Okane, Tetsuo; Yamada, Mitsuki*; Suzuki, S.*; Sato, S.*; Kinoshita, Toyohiko*; Kakizaki, A.*; Ishii, T.*; Kobayashi, Takane*; Shimoda, S.*; Iwaki, M.*; et al.

Journal of Electron Spectroscopy and Related Phenomena, 80, p.241 - 244, 1996/05

 Times Cited Count:4 Percentile:26.72(Spectroscopy)

no abstracts in English

Oral presentation

Study of the electronic states of AlH$$_{3}$$ by soft X-ray emission spectroscopy

Takeda, Yukiharu; Okane, Tetsuo; Fujimori, Shinichi; Yasui, Akira; Saito, Yuji; Yamagami, Hiroshi; Saito, Hiroyuki; Muro, Takayuki*; Kato, Yukako*; Kinoshita, Toyohiko*

no journal, , 

no abstracts in English

Oral presentation

Study of the electronic structure of AlH$$_{3}$$ using soft X-ray emission and absorption spectroscopy

Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Saito, Hiroyuki; Machida, Akihiko; Aoki, Katsutoshi; Muro, Takayuki*; Kato, Yukako*; Kinoshita, Toyohiko*

no journal, , 

no abstracts in English

Oral presentation

LEED and SR-XPS observations of graphitization on orientationally rotated epitaxial film of 3C-SiC(111)/Si(110)

Takahashi, Ryota*; Handa, Hiroyuki*; Abe, Shunsuke*; Inomata, Shuya*; Imaizumi, Kei*; Fukidome, Hirokazu*; Teraoka, Yuden; Yoshigoe, Akitaka; Kotsugi, Masato*; Okochi, Takuo*; et al.

no journal, , 

no abstracts in English

Oral presentation

Electronic states of lithium amide

Kamakura, Nozomu; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Tsubota, Masami*; Paik, B.*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; Muro, Takayuki*; Kinoshita, Toyohiko*

no journal, , 

Lithium amide (LiNH$$_{2}$$) is lightweight complex hydride expected as a high-capacity hydrogen storage material. The electronic structure of lithium amide (LiNH$$_{2}$$) is investigated by soft X-ray emission spectroscopy (XES) and absorption spectroscopy (XAS). The unoccupied and occupied parts of the N 2$$p$$ partial density of states are studied by N 1$$s$$ XAS in the fluorescence yield mode and XES using soft X-ray (h$$nu$$=425eV) of SPring-8. The XES and XAS spectra show a band gap between the valence and conduction bands. The valence band in the XES spectrum consists of three peaks, which extend up to $$sim$$ -8eV from the valence band top. The overall feature of the electronic structure of lithium amide by the XES and XAS is consistent with the band calculation. The strongly hybridized state with H 1$$s$$ observed on the high binding energy side in the XES is discussed.

Oral presentation

LEED and SR-XPS observations of graphene formation processes on 3C-SiC(100)/Si(100) thin film

Inomata, Shuya*; Handa, Hiroyuki*; Abe, Shunsuke*; Takahashi, Ryota*; Imaizumi, Kei*; Fukidome, Hirokazu*; Teraoka, Yuden; Yoshigoe, Akitaka; Kotsugi, Masato*; Okochi, Takuo*; et al.

no journal, , 

no abstracts in English

Oral presentation

LEED and SR-XPS observations on graphitization of epitaxial 3C-SiC(100) filmson Si(100) substrates

Inomata, Shuya*; Handa, Hiroyuki*; Abe, Shunsuke*; Takahashi, Ryota*; Imaizumi, Kei*; Fukidome, Hirokazu*; Teraoka, Yuden; Yoshigoe, Akitaka; Kotsugi, Masato*; Okochi, Takuo*; et al.

no journal, , 

no abstracts in English

Oral presentation

Electronic states of amide hydrides

Kamakura, Nozomu; Takeda, Yukiharu; Okane, Tetsuo; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Miyaoka, Hiroki*; Tsubota, Masami*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; et al.

no journal, , 

no abstracts in English

Oral presentation

Electronic states of alkali metal amide and alkaline earth metal amide

Kamakura, Nozomu; Yamagami, Hiroshi; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Miyaoka, Hiroki*; Tsubota, Masami*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; Muro, Takayuki*; et al.

no journal, , 

In this research, the electronic states of the insulator alkali metal amide ($$mathrm{KNH_2}$$, $$mathrm{NaNH_2}$$) and alkaline earth metal amide ($$mathrm{Ca(NH_{2})_{2}}$$), which are lightweight complex hydrides being considered as a high-capacity hydrogen storage material, are investigated by the soft X-ray emission (XES)and absorption spectroscopies. The sharp three peak structure commonly observed in the XES spectrum of alkali metal amides shows the localized character of the valence electrons, while the importance of the number of the amide ion is shown by the XES spectrum of $$mathrm{Ca(NH_{2})_{2}}$$ which is clearly different from that of alkali metal amide. The comparison with the band calculation clarifies the electronic sates of $$mathrm{Ca(NH_{2})_{2}}$$.

Oral presentation

Electronic states of alkali metal amide and alkaline earth metal amide

Kamakura, Nozomu; Takeda, Yukiharu; Yamagami, Hiroshi; Miyaoka, Hiroki*; Tsubota, Masami*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; Muro, Takayuki*; Kinoshita, Toyohiko*

no journal, , 

Metal amide has been attracted much attention as a lightweight hydride being considered for high capacity hydrogen storage materials. In this research, the electronic states of the insulator alkali metal amide (KNH$$_{2}$$, NaNH$$_{2}$$) and alkaline earth metal amide (Ca(NH$$_{2}$$)$$_{2}$$, Mg(NH$$_{2}$$)$$_{2}$$) are investigated by the soft X-ray emission spectroscopy (XES) and absorption spectroscopy (XAS) in the total fluorescence yield mode. The localized character of the valence electrons is shown by the sharp three peak structure commonly observed in the XES spectrum of alkali metal amide. The localized character of the valence electrons is shown by the sharp peak structure commonly observed in the XES spectrum of alkali metal amide. The broadening of the N 2p states by the hybridization is observed in the XES spectrum of the alkaline earth metal amide. Decomposition temperature of the metal amide is found to relate to the character of the chemical bond observed in the XAS.

Oral presentation

Surface-chemical bonding states of rotated epitaxial thin film of 3C-SiC(111)/Si(110)

Sambonsuge, Shota*; Abe, Shunsuke*; Takahashi, Ryota*; Imaizumi, Kei*; Handa, Hiroyuki*; Yoshigoe, Akitaka; Teraoka, Yuden; Kotsugi, Masato*; Okochi, Takuo*; Kinoshita, Toyohiko*; et al.

no journal, , 

no abstracts in English

Oral presentation

Control of electronic and structural properties of epitaxial graphene on 3C-SiC/Si and its device applications

Fukidome, Hirokazu*; Kotsugi, Masato*; Okochi, Takuo*; Yoshigoe, Akitaka; Teraoka, Yuden; Enta, Yoshiharu*; Kinoshita, Toyohiko*; Suemitsu, Tetsuya*; Otsuji, Taiichi*; Suemitsu, Maki*

no journal, , 

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