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Journal Articles

Elemental substitution effects in multiferroic ${it R}$Fe$$_{2}$$O$$_{4}$$ (${it R}$: rare earths)

Yoshii, Kenji; Funae, Takeshi*; Mizumaki, Masaichiro*; Ejiri, Hiroki*; Ikeda, Naoshi*; Saito, Hiroyuki; Matsumura, Daiju

Physica Status Solidi (C), 12(6), p.841 - 844, 2015/06

https://doi.org/10.1002/pssc.201400250
 Times Cited Count：1 Percentile：38.69(Physics, Condensed Matter)

We report the effects of elemental substitutions in multiferroic ${it R}$Fe$$_{2}$$O$$_{4}$$ ($$R$$: Y, Ho-Lu, In). The substitution by nonmagnetic Ga$$^{3+}$$ at the Fe site, which has not been reported so far, shows a drastic decrease in the ferrimagnetic transition temperature ($$T_{rm N}$$). This is plausibly owing to the suppression of magnetic interactions between Fe ions, based on our previous results of other substituted systems such as ${it R}$FeCoO$$_{4}$$. Dielectric constants near room temperature were comparable to those of $$R$$Fe$$_{2}$$O$$_{4}$$. The suppression of dielectric loss in this system is suitable to application. The ${it R}$-site substitution was also attempted by the large R$$^{3+}$$ ions such as Dy$$^{3+}$$. The solubility limit was up to about 10% of ${it R}$ ions, as confirmed by XRD and EXAFS measurements. $$T_{rm N}$$ was raised by 5-10 K for Dy$$^{3+}$$ substitution.

Journal Articles

Electronic structure of BaFeO$$_{3}$$ studied by X-ray spectroscopy

Mizumaki, Masaichiro*; Fujii, Hitoshi*; Yoshii, Kenji; Hayashi, Naoaki*; Saito, Takashi*; Shimakawa, Yuichi*; Uozumi, Takayuki*; Takano, Mikio*

Physica Status Solidi (C), 12(6), p.818 - 821, 2015/06

https://doi.org/10.1002/pssc.201400252
 Times Cited Count：11 Percentile：94.75(Physics, Condensed Matter)

We investigated the electronic structure of BaFeO$$_{3}$$ by using HAXPES and XAS measurements and first principle studies. The experimental and theoretical results indicated that BaFeO$$_{3}$$ is a negative charge transfer compound. We concluded that the on-site Coulomb energy and the strong hybridization between Fe-3d and O-2p orbitals play a very important role of emergence of negative charge transfer. And we found the new structure in the Fe-2p XPS spectrum and concluded this structure is originated from non-local screening.

Journal Articles

Ion beam analysis of quaternary Heusler alloy Co$$_{2}$$(Mn$$_{1-x}$$Fe$$_{x}$$)Si(111) epitaxially grown on Ge(111)

Kawakubo, Yuki*; Noguchi, Masaya*; Hirata, Tomoaki*; Narumi, Kazumasa; Sakai, Seiji; Yamada, Shinya*; Hamaya, Kohei*; Miyao, Masanobu*; Maeda, Yoshihito

Physica Status Solidi (C), 10(12), p.1828 - 1831, 2013/12

https://doi.org/10.1002/pssc.201300367
 Times Cited Count：0 Percentile：0.00(Nanoscience & Nanotechnology)

Journal Articles

RBS study of disordering of Fe$$_{3-x}$$Mn$$_{x}$$Si/Ge(111) heteroepitaxial interfaces

Noguchi, Masaya*; Hirata, Tomoaki*; Kawakubo, Yuki*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito

Physica Status Solidi (C), 10(12), p.1732 - 1734, 2013/12

https://doi.org/10.1002/pssc.201300380
 Times Cited Count：0 Percentile：0.00(Nanoscience & Nanotechnology)

Journal Articles

Optimization of substrate pretreatment and deposition conditions for epitaxial growth of $$beta$$-FeSi$$_2$$ film on Si(100)

Yamaguchi, Kenji; Hamamoto, Satoshi*; Hojo, Kiichi

Physica Status Solidi (C), 10(12), p.1699 - 1703, 2013/12

https://doi.org/10.1002/pssc.201300355
 Times Cited Count：0 Percentile：0.00(Nanoscience & Nanotechnology)

Effect of substrate treatment conditions, deposition temperature and deposition rate on the crystallinity of $$beta$$-FeSi$$_2$$ films formed on Si substrate was investigated. The substrates were treated with Ne$$^+$$ ion beams at room temperature and then annealed at 1073 K prior to film fabrication by means of ion beam sputter deposition (IBSD) method. Combinations of experimental parameters which promote the epitaxial relationship of $$beta$$-FeSi$$_2$$ (100) // Si (100) were defined. Complicated dependence of these experimental parameters on the film structure indicated that careful optimization of substrate treatment conditions and deposition parameters would enable to obtain $$beta$$-FeSi$$_2$$ films with excellent crystalline properties.

Journal Articles

Magnetoresistance effects in current-perpendicular-to-plane structures based on Fe$$_{3}$$Si/FeSi$$_{2}$$ artificial lattices

Sakai, Kenichiro*; Noda, Yuta*; Takeda, Kaoru*; Takeda, Masayasu; Yoshitake, Tsuyoshi*

Physica Status Solidi (C), 10(12), p.1862 - 1865, 2013/12

https://doi.org/10.1002/pssc.201300322
 Times Cited Count：1 Percentile：51.74(Nanoscience & Nanotechnology)

Journal Articles

Defect characterization in compositionally graded InGaAs layers on GaAs (001) grown by MBE

Sasaki, Takuo; Norman, A. G.*; Romero, M. J.*; Al-Jassim, M. M.*; Takahashi, Masamitsu; Kojima, Nobuaki*; Oshita, Yoshio*; Yamaguchi, Masafumi*

Physica Status Solidi (C), 10(11), p.1640 - 1643, 2013/11

https://doi.org/10.1002/pssc.201300284
 Times Cited Count：4 Percentile：82.39(Physics, Applied)

Journal Articles

Gutzwiller method for heavy-fermion systems under a magnetic field

Kubo, Katsunori

Physica Status Solidi (C), 10(3), p.544 - 548, 2013/03

https://doi.org/10.1002/pssc.201200762
 Times Cited Count：5 Percentile：88.47(Materials Science, Multidisciplinary)

Journal Articles

Effect of oxygen-to-metal ratio on densification behavior in the sintering process of PuO$$_{2}$$ pellet

Uchida, Teppei; Sunaoshi, Takeo*; Kato, Masato

Physica Status Solidi (C), 10(2), p.193 - 196, 2013/02

https://doi.org/10.1002/pssc.201200475
 Times Cited Count：6 Percentile：90.94(Materials Science, Multidisciplinary)

Journal Articles

Measurement of oxygen chemical diffusion in PuO$$_{2-x}$$ and analysis of oxygen diffusion in PuO$$_{2-x}$$ and (Pu,U)O$$_{2-x}$$

Kato, Masato; Uchida, Teppei; Sunaoshi, Takeo*

Physica Status Solidi (C), 10(2), p.189 - 192, 2013/02

https://doi.org/10.1002/pssc.201200454
 Times Cited Count：6 Percentile：90.94(Materials Science, Multidisciplinary)

Journal Articles

Enhancement of IR light emission from $$beta$$-FeSi$$_{2}$$ nanocrystals embedded in Si

Maeda, Yoshihito; Nishimura, Kentaro*; Nakajima, Takahito*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji

Physica Status Solidi (C), 9(10-11), p.1888 - 1891, 2012/10

https://doi.org/10.1002/pssc.201200072
 Times Cited Count：3 Percentile：81.45(Materials Science, Multidisciplinary)

We have systematically investigated photoluminescence (PL) properties of $$beta$$-phase nanocrystals which are formed by a phase transition from metastable $$gamma$$-FeSi$$_{2}$$ with a Fluorite structure to $$beta$$-FeSi$$_{2}$$, and succeeded in enhancement of the PL intensity in the optimum conditions of double annealing process. For the PL enhancement, the time of postannealing at 800$$^{circ}$$C is dominated by the time of the preannealing at 400 or 500$$^{circ}$$C which is related to amount of the $$gamma$$-phase. After discussing some possible factors, we speculate that the PL enhancement observed in this study may be attributed mainly to improvement of the interface condition between the nanocrystal and Si, because the crystallographic epitaxial relationship among the phases, Si(111)//$$gamma$$(111)//$$beta$$(202)/(220) can be maintained during precipitation of the nanocrystal on Si(111).

Journal Articles

Photoluminescence properties of carbon-doped $$beta$$-FeSi$$_{2}$$ nanocrystals

Maeda, Yoshihito; Nishimura, Kentaro*; Nakajima, Takahito*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji

Physica Status Solidi (C), 9(10-11), p.1884 - 1887, 2012/10

https://doi.org/10.1002/pssc.201200058
 Times Cited Count：4 Percentile：87.01(Materials Science, Multidisciplinary)

We report enhancement of intrinsic photoluminescence (PL) from $$beta$$-FeSi$$_{2}$$ nanocrystals by doping carbon. In the appropriate dose of C$$_{60}$$$$^{+}$$ ion implantation into the average nanocrystal size of 14 nm, the PL intensity was enhanced by 260% and increase of the exciton binding energy of 1.8 meV in comparison with that of the non-doped nanocrystal. Furthermore, we found that there was a clear correlation between the PL enhancement and increase of the exciton binding energy. This important result suggests that carbon atoms doped in the silicide lattice may play as an isoelectronic trap and probably form bound excitons with stable states as predicted theoretically. We found a new mechanism of the PL enhancement for $$beta$$-FeSi$$_{2}$$ nanocrystals.

Journal Articles

Formation of boron nitride ultra-thin films on Si(111)

Shimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro; Nath, K. G.*

Physica Status Solidi (C), 9(6), p.1450 - 1453, 2012/06

https://doi.org/10.1002/pssc.201100665
 Times Cited Count：3 Percentile：72.22(Physics, Applied)

no abstracts in English

Journal Articles

Surface study of organopalladium molecules on S-terminated GaAs

Konishi, Tomoya*; Nishiwaki, Nagatoshi*; Tojo, Takashi*; Ishikawa, Takuma*; Teraoka, Teruki*; Ueta, Yukiko*; Kihara, Yoshifumi*; Moritoki, Hideji*; Tono, Tatsuo*; Musashi, Mio*; et al.

Physica Status Solidi (C), 8(2), p.405 - 407, 2011/02

https://doi.org/10.1002/pssc.201000436
 Times Cited Count：3 Percentile：73.77(Engineering, Electrical & Electronic)

Journal Articles

Light emitting FET based-on spatially selective doping of Eu in AlGaN/GaN HEMT

Okada, Hiroshi*; Takemoto, Kazumasa*; Oikawa, Fumitake*; Furukawa, Yuzo*; Wakahara, Akihiro*; Sato, Shinichiro; Oshima, Takeshi

Physica Status Solidi (C), 6(Suppl.2), p.S631 - S634, 2009/05

Light emitting field effect transistor (FET) based-on AlGaN/GaN high electron mobility transistor (HEMT) structure with spatially selective doping of rare-earth ions (REIs) as a luminescence center in the channel is proposed and investigated. Fabricated device showed excellent I-V characteristics as a transistor with gate control. By applying a drain bias of 20 V, red emission suggesting a luminescence from Eu ion was clearly observed. Applying a negative bias to the Schottky gate decreased the luminescence intensity.

Journal Articles

Characterization of ion beam-induced SiC-OI structures by positron annihilation spectroscopy

Maekawa, Masaki; Yu, R.; Kawasuso, Atsuo

Physica Status Solidi (C), 4(10), p.3680 - 3683, 2007/09

https://doi.org/10.1002/pssc.200675822
 Times Cited Count：0 Percentile：0.00(Physics, Atomic, Molecular & Chemical)

no abstracts in English

Journal Articles

Reflection high-energy positron diffraction study of surface super-structures

Kawasuso, Atsuo; Fukaya, Yuki*; Hayashi, Kazuhiko; Hashimoto, Mie; Ichimiya, Ayahiko

Physica Status Solidi (C), 4(10), p.3924 - 3927, 2007/09

https://doi.org/10.1002/pssc.200675815

Well-focused and highly parallel positron beam is totally reflected at the first surface layer when grazing incidence at a small enough angles. Therefore, the reflection high-energy positron diffraction (RHEPD) is suited to determine the surface structures without any disturbance from the bulk. Using the electro-magnetic lenses we developed a positron beam which has more coherence than before. We found that the RHEPD pattern from the Si-7$$times$$7 surface is considerably different from that of electron diffraction. The difference is reasonably explained as a strong thermal diffuse scattering of positrons. As a further application, we studied the phase transition of Si-Ag ultra-thin film. We found that the surface-sensitive diffraction spots exhibit significant temperature dependences. Based on the dynamical diffraction theory, the temperature dependences are reproduced considering the order-disorder phase transition. This will terminate the long debates in the surface science community. Furthermore, we recently found that the positron-surface interaction is different from the electron-surface interaction, especially in the elastic processes. We present the above recent advances of surface studies using RHEPD.

Journal Articles

Characterization of swift heavy ion-induced defects in Fe-Rh alloy by using positron beam technique

Hori, Fuminobu*; Fukuzumi, Masafumi*; Kawasuso, Atsuo; Zushi, Yoshihiro*; Chimi, Yasuhiro; Ishikawa, Norito; Iwase, Akihiro*

Physica Status Solidi (C), 4(10), p.3530 - 3533, 2007/09

https://doi.org/10.1002/pssc.200675829
 Times Cited Count：0 Percentile：0.00(Physics, Atomic, Molecular & Chemical)

no abstracts in English

Journal Articles

Design of a positron microprobe using magnetic lenses

Maekawa, Masaki; Yu, R.; Kawasuso, Atsuo

Physica Status Solidi (C), 4(10), p.4016 - 4019, 2007/09

https://doi.org/10.1002/pssc.200675821
 Times Cited Count：4 Percentile：72.60(Physics, Atomic, Molecular & Chemical)

no abstracts in English

Journal Articles

Ion species dependence of the implantation-induced defects in ZnO studied by a slow positron beam

Chen, Z. Q.*; Maekawa, Masaki; Kawasuso, Atsuo; Naramoto, Hiroshi

Physica Status Solidi (C), 4(10), p.3646 - 3649, 2007/09

https://doi.org/10.1002/pssc.200775793
 Times Cited Count：2 Percentile：56.25(Physics, Atomic, Molecular & Chemical)

We implanted B$$^{+}$$, O$$^{+}$$, Al$$^{+}$$, and P$$^{+}$$ ions into ZnO (Dose: 4E+15/cm$$^{2}$$). The thermal recovery of implantation-induced defects were studied using a slow positron beam. S parameters show much increase after ion implantation, indication introduction of vacancy defects. The thermal recovery of these vacancies induced by different ions shows much difference. For O$$^{+}$$ implantation, vacancy clusters disappear rapidly after annealing up to about 700$$^{circ}$$C. For the lighter ion B$$^{+}$$ implantation, however, vacancy clusters grow to a larger size at 500$$^{circ}$$C. The vacancies begin to recover and disappear after further annealing up to 900$$^{circ}$$C. For the Al$$^{+}$$ implantation, the vacancies grow into even a much larger size after annealing at 600$$^{circ}$$C, and they are annealed out at 900$$^{circ}$$C. However, for the P$$^{+}$$ -implanted sample, it was shown that a much weaker agglomeration process of the vacancy clusters compared with Al$$^{+}$$ implantation. A higher annealing temperature of 1100$$^{circ}$$C is needed to fully remove these vacancies.

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