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Journal Articles

Antiferromagnetic interaction between paramagnetic Co ions in the diluted magnetic semiconductor Zn$$_{1-x}$$Co$$_x$$O

Kobayashi, Masaki*; Ishida, Yukiaki*; Hwang, J. I.*; Osafune, Yoshitaka*; Fujimori, Atsushi*; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Kobayashi, Keisuke*; Saeki, Hiromasa*; et al.

Physical Review B, 81(7), p.075204_1 - 075204_7, 2010/02


 Times Cited Count:19 Percentile:63.91(Materials Science, Multidisciplinary)

Journal Articles

Experimental observation of bulk band dispersions in the oxide semiconductor ZnO using soft X-ray angle-resolved photoemission spectroscopy

Kobayashi, Masaki*; Song, G.-S.*; Kataoka, Takashi*; Sakamoto, Yuta*; Fujimori, Atsushi; Okochi, Takuo*; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Yamagami, Hiroshi; et al.

Journal of Applied Physics, 105(12), p.122403_1 - 122403_4, 2009/06


 Times Cited Count:11 Percentile:44.09(Physics, Applied)

Journal Articles

X-ray absorption magnetic circular dichroism of (La,Ce)MnO$$_{3}$$ thin films

Yanagida, Tsuyoshi*; Saito, Yuji; Takeda, Yukiharu; Fujimori, Atsushi*; Tanaka, Hidekazu*; Kawai, Tomoji*

Physical Review B, 79(13), p.132405_1 - 132405_4, 2009/04


 Times Cited Count:11 Percentile:47.05(Materials Science, Multidisciplinary)

Creating a bipolarity of semiconductors has been a key technology to develop recent advanced semiconductor devices. Although theoretical calculation predicts the presence of ferromagnetic electron-doped manganites with doping tetravalent cations, the ferromagnetic origin in experiments has been controversial due to the lack of direct experimental evidence. Here, we investigate the ferromagnetism in (La,Ce)MnO$$_{3}$$ thin films by measuring the magnetic circular dichroism in soft X-ray absorption (XMCD). The XMCD measurements clarified that the ferromagnetism is not caused by the presence of Mn$$^{2+}$$ but by self-hole doping for manganese.

Journal Articles

Photoemission and X-ray absorption studies of valence states in (Ni,Zn,Fe,Ti)$$_3$$O$$_4$$ thin films exhibiting photoinduced magnetization

Kobayashi, Masaki*; Oki, Yasuhiro*; Takizawa, Masaru*; Song, G. S.*; Fujimori, Atsushi; Takeda, Yukiharu; Terai, Kota*; Okane, Tetsuo; Fujimori, Shinichi; Saito, Yuji; et al.

Applied Physics Letters, 92(8), p.082502_1 - 082502_3, 2008/02

 Times Cited Count:12 Percentile:46.11(Physics, Applied)

Journal Articles

Soft X-ray magnetic circular dichroism study of weakly ferromagnetic Zn$$_{1-x}$$V$$_{x}$$O thin film

Ishida, Yukiaki*; Hwang, J. I.*; Kobayashi, Masaki*; Takeda, Yukiharu; Mamiya, Kazutoshi*; Okamoto, Jun*; Fujimori, Shinichi; Okane, Tetsuo; Terai, Kota*; Saito, Yuji; et al.

Applied Physics Letters, 90(2), p.022510_1 - 022510_3, 2007/01

 Times Cited Count:23 Percentile:65.76(Physics, Applied)

no abstracts in English

Journal Articles

Characterization of magnetic components in the diluted magnetic semiconductor Zn$$_{1-x}$$Co$$_x$$O by X-ray magnetic circular dichroism

Kobayashi, Masaki*; Ishida, Yukiaki*; Hwang, J. I.*; Mizokawa, Takashi*; Fujimori, Atsushi*; Mamiya, Kazutoshi*; Okamoto, Jun*; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; et al.

Physical Review B, 72(20), p.201201_1 - 201201_4, 2005/11

 Times Cited Count:139 Percentile:96.34(Materials Science, Multidisciplinary)

no abstracts in English

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