14 results on '"Ikenaga, Eiji"'
Search Results
2. Magnetic dichroism in angle-resolved hard x-ray photoemission from buried layers
- Author
-
Kozina, Xeniya, Fecher, Gerhard, Stryganyuk, Gregory, Ouardi, Siham, Balke, Benjamin, Felser, Claudia, Schönhense, Gerd, Ikenaga, Eiji, Sugiyama, Takeharu, Kawamura, Naomi, Suzuki, Motohiro, Taira, Tomoyuki, Uemura, Tetsuya, Yamamoto, Masafumi, Sukegawa, Hiroaki, Wang, Wenhong, Inomata, Koichiro, Kobayashi, Keisuke, Kozina, Xeniya, Fecher, Gerhard, Stryganyuk, Gregory, Ouardi, Siham, Balke, Benjamin, Felser, Claudia, Schönhense, Gerd, Ikenaga, Eiji, Sugiyama, Takeharu, Kawamura, Naomi, Suzuki, Motohiro, Taira, Tomoyuki, Uemura, Tetsuya, Yamamoto, Masafumi, Sukegawa, Hiroaki, Wang, Wenhong, Inomata, Koichiro, and Kobayashi, Keisuke
- Abstract
This work reports the measurement of magnetic dichroism in angular-resolved photoemission from in-plane magnetized buried thin films. The high bulk sensitivity of hard x-ray photoelectron spectroscopy (HAXPES) in combination with circularly polarized radiation enables the investigation of the magnetic properties of buried layers. HAXPES experiments with an excitation energy of 8 keV were performed on exchange-biased magnetic layers covered by thin oxide films. Two types of structures were investigated with the IrMn exchange-biasing layer either above or below the ferromagnetic layer: one with a CoFe layer on top and another with a Co2FeAl layer buried beneath the IrMn layer. A pronounced magnetic dichroism is found in the Co and Fe 2p states of both materials. The localization of the magnetic moments at the Fe site conditioning the peculiar characteristics of the Co2FeAl Heusler compound, predicted to be a half-metallic ferromagnet, is revealed from the magnetic dichroism detected in the Fe 2p states.
- Published
- 2011
3. Magnetic dichroism in angle-resolved hard x-ray photoemission from buried layers
- Author
-
Kozina, Xeniya, Fecher, Gerhard, Stryganyuk, Gregory, Ouardi, Siham, Balke, Benjamin, Felser, Claudia, Schönhense, Gerd, Ikenaga, Eiji, Sugiyama, Takeharu, Kawamura, Naomi, Suzuki, Motohiro, Taira, Tomoyuki, Uemura, Tetsuya, Yamamoto, Masafumi, Sukegawa, Hiroaki, Wang, Wenhong, Inomata, Koichiro, Kobayashi, Keisuke, Kozina, Xeniya, Fecher, Gerhard, Stryganyuk, Gregory, Ouardi, Siham, Balke, Benjamin, Felser, Claudia, Schönhense, Gerd, Ikenaga, Eiji, Sugiyama, Takeharu, Kawamura, Naomi, Suzuki, Motohiro, Taira, Tomoyuki, Uemura, Tetsuya, Yamamoto, Masafumi, Sukegawa, Hiroaki, Wang, Wenhong, Inomata, Koichiro, and Kobayashi, Keisuke
- Abstract
This work reports the measurement of magnetic dichroism in angular-resolved photoemission from in-plane magnetized buried thin films. The high bulk sensitivity of hard x-ray photoelectron spectroscopy (HAXPES) in combination with circularly polarized radiation enables the investigation of the magnetic properties of buried layers. HAXPES experiments with an excitation energy of 8 keV were performed on exchange-biased magnetic layers covered by thin oxide films. Two types of structures were investigated with the IrMn exchange-biasing layer either above or below the ferromagnetic layer: one with a CoFe layer on top and another with a Co2FeAl layer buried beneath the IrMn layer. A pronounced magnetic dichroism is found in the Co and Fe 2p states of both materials. The localization of the magnetic moments at the Fe site conditioning the peculiar characteristics of the Co2FeAl Heusler compound, predicted to be a half-metallic ferromagnet, is revealed from the magnetic dichroism detected in the Fe 2p states.
- Published
- 2011
4. Magnetic dichroism in angle-resolved hard x-ray photoemission from buried layers
- Author
-
Kozina, Xeniya, Fecher, Gerhard, Stryganyuk, Gregory, Ouardi, Siham, Balke, Benjamin, Felser, Claudia, Schönhense, Gerd, Ikenaga, Eiji, Sugiyama, Takeharu, Kawamura, Naomi, Suzuki, Motohiro, Taira, Tomoyuki, Uemura, Tetsuya, Yamamoto, Masafumi, Sukegawa, Hiroaki, Wang, Wenhong, Inomata, Koichiro, Kobayashi, Keisuke, Kozina, Xeniya, Fecher, Gerhard, Stryganyuk, Gregory, Ouardi, Siham, Balke, Benjamin, Felser, Claudia, Schönhense, Gerd, Ikenaga, Eiji, Sugiyama, Takeharu, Kawamura, Naomi, Suzuki, Motohiro, Taira, Tomoyuki, Uemura, Tetsuya, Yamamoto, Masafumi, Sukegawa, Hiroaki, Wang, Wenhong, Inomata, Koichiro, and Kobayashi, Keisuke
- Abstract
This work reports the measurement of magnetic dichroism in angular-resolved photoemission from in-plane magnetized buried thin films. The high bulk sensitivity of hard x-ray photoelectron spectroscopy (HAXPES) in combination with circularly polarized radiation enables the investigation of the magnetic properties of buried layers. HAXPES experiments with an excitation energy of 8 keV were performed on exchange-biased magnetic layers covered by thin oxide films. Two types of structures were investigated with the IrMn exchange-biasing layer either above or below the ferromagnetic layer: one with a CoFe layer on top and another with a Co2FeAl layer buried beneath the IrMn layer. A pronounced magnetic dichroism is found in the Co and Fe 2p states of both materials. The localization of the magnetic moments at the Fe site conditioning the peculiar characteristics of the Co2FeAl Heusler compound, predicted to be a half-metallic ferromagnet, is revealed from the magnetic dichroism detected in the Fe 2p states.
- Published
- 2011
5. Magnetic dichroism in angle-resolved hard x-ray photoemission from buried layers
- Author
-
Kozina, Xeniya, Fecher, Gerhard, Stryganyuk, Gregory, Ouardi, Siham, Balke, Benjamin, Felser, Claudia, Schönhense, Gerd, Ikenaga, Eiji, Sugiyama, Takeharu, Kawamura, Naomi, Suzuki, Motohiro, Taira, Tomoyuki, Uemura, Tetsuya, Yamamoto, Masafumi, Sukegawa, Hiroaki, Wang, Wenhong, Inomata, Koichiro, Kobayashi, Keisuke, Kozina, Xeniya, Fecher, Gerhard, Stryganyuk, Gregory, Ouardi, Siham, Balke, Benjamin, Felser, Claudia, Schönhense, Gerd, Ikenaga, Eiji, Sugiyama, Takeharu, Kawamura, Naomi, Suzuki, Motohiro, Taira, Tomoyuki, Uemura, Tetsuya, Yamamoto, Masafumi, Sukegawa, Hiroaki, Wang, Wenhong, Inomata, Koichiro, and Kobayashi, Keisuke
- Abstract
This work reports the measurement of magnetic dichroism in angular-resolved photoemission from in-plane magnetized buried thin films. The high bulk sensitivity of hard x-ray photoelectron spectroscopy (HAXPES) in combination with circularly polarized radiation enables the investigation of the magnetic properties of buried layers. HAXPES experiments with an excitation energy of 8 keV were performed on exchange-biased magnetic layers covered by thin oxide films. Two types of structures were investigated with the IrMn exchange-biasing layer either above or below the ferromagnetic layer: one with a CoFe layer on top and another with a Co2FeAl layer buried beneath the IrMn layer. A pronounced magnetic dichroism is found in the Co and Fe 2p states of both materials. The localization of the magnetic moments at the Fe site conditioning the peculiar characteristics of the Co2FeAl Heusler compound, predicted to be a half-metallic ferromagnet, is revealed from the magnetic dichroism detected in the Fe 2p states.
- Published
- 2011
6. Combination of high-resolution RBS and angle-resolved XPS: accurate depth profiling of chemical states
- Author
-
Kimura, Kenji, Nakajima, Kaoru, Zhao, Ming, Nohira, Hiroshi, Hattori, Takeo, Kobata, Masaaki, Ikenaga, Eiji, Kim, Jung An, Kobayashi, Keisuke, Conard, Thierry, Vandervorst, Wilfried, Kimura, Kenji, Nakajima, Kaoru, Zhao, Ming, Nohira, Hiroshi, Hattori, Takeo, Kobata, Masaaki, Ikenaga, Eiji, Kim, Jung An, Kobayashi, Keisuke, Conard, Thierry, and Vandervorst, Wilfried
- Published
- 2008
7. Combination of high-resolution RBS and angle-resolved XPS: accurate depth profiling of chemical states
- Author
-
50127073, 80293885, Kimura, Kenji, Nakajima, Kaoru, Zhao, Ming, Nohira, Hiroshi, Hattori, Takeo, Kobata, Masaaki, Ikenaga, Eiji, Kim, Jung An, Kobayashi, Keisuke, Conard, Thierry, Vandervorst, Wilfried, 50127073, 80293885, Kimura, Kenji, Nakajima, Kaoru, Zhao, Ming, Nohira, Hiroshi, Hattori, Takeo, Kobata, Masaaki, Ikenaga, Eiji, Kim, Jung An, Kobayashi, Keisuke, Conard, Thierry, and Vandervorst, Wilfried
- Published
- 2008
8. Evidence for Suppressed Screening on the Surface of High Temperature La2-xSrxCuO4 and Nd2-xCexCuO4 Superconductors
- Author
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Taguchi, Munetaka, Chainani, Ashish, Horiba, Koji, Takata, Yasutaka, Yabashi, Makina, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Ishikawa, Tetsuya, Takeuchi, Tomoyuki, Yamamoto, Kazuo, Matsunami, Masaharu, Shin, Shik, Yokoya, Takayoshi, Ikenaga, Eiji, Kobayashi, Keisuke, Mochiku, Takashi, Hirata, Kazuto, Hori, Junya, Ishii, Kiyotaka, Nakamura, Fumihiko, Suzuki, Takashi, Taguchi, Munetaka, Chainani, Ashish, Horiba, Koji, Takata, Yasutaka, Yabashi, Makina, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Ishikawa, Tetsuya, Takeuchi, Tomoyuki, Yamamoto, Kazuo, Matsunami, Masaharu, Shin, Shik, Yokoya, Takayoshi, Ikenaga, Eiji, Kobayashi, Keisuke, Mochiku, Takashi, Hirata, Kazuto, Hori, Junya, Ishii, Kiyotaka, Nakamura, Fumihiko, and Suzuki, Takashi
- Abstract
type:text, Hard x-ray photoemission spectroscopy (PES) of Cu core electronic states, with a probing depth of ∼60, is used to show that the Zhang-Rice singlet feature is present in La2CuO4 but is absent in Nd2CuO4. Hole and electron doping in La2-xSrxCuO4 (LSCO) and Nd2-xCexCuO4 (NCCO) result in new well-screened features which are missing in soft x-ray PES. Impurity Anderson model calculations establish screening from doped states as its origin, which is strongly suppressed within 15 of the surface. Complemented with x-ray absorption spectroscopy, the small chemical-potential shift in core levels (∼0.2eV) are shown to be consistent with modifications of valence and conduction band states spanning the band gap (∼1eV) upon hole and electron doping in LSCO and NCCO.
- Published
- 2005
9. Evidence for Suppressed Screening on the Surface of High Temperature La2-xSrxCuO4 and Nd2-xCexCuO4 Superconductors
- Author
-
Taguchi, Munetaka, Chainani, Ashish, Horiba, Koji, Takata, Yasutaka, Yabashi, Makina, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Ishikawa, Tetsuya, Takeuchi, Tomoyuki, Yamamoto, Kazuo, Matsunami, Masaharu, Shin, Shik, Yokoya, Takayoshi, Ikenaga, Eiji, Kobayashi, Keisuke, Mochiku, Takashi, Hirata, Kazuto, Hori, Junya, Ishii, Kiyotaka, Nakamura, Fumihiko, Suzuki, Takashi, Taguchi, Munetaka, Chainani, Ashish, Horiba, Koji, Takata, Yasutaka, Yabashi, Makina, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Ishikawa, Tetsuya, Takeuchi, Tomoyuki, Yamamoto, Kazuo, Matsunami, Masaharu, Shin, Shik, Yokoya, Takayoshi, Ikenaga, Eiji, Kobayashi, Keisuke, Mochiku, Takashi, Hirata, Kazuto, Hori, Junya, Ishii, Kiyotaka, Nakamura, Fumihiko, and Suzuki, Takashi
- Abstract
Hard x-ray photoemission spectroscopy (PES) of Cu core electronic states, with a probing depth of ∼60, is used to show that the Zhang-Rice singlet feature is present in La2CuO4 but is absent in Nd2CuO4. Hole and electron doping in La2-xSrxCuO4 (LSCO) and Nd2-xCexCuO4 (NCCO) result in new well-screened features which are missing in soft x-ray PES. Impurity Anderson model calculations establish screening from doped states as its origin, which is strongly suppressed within 15 of the surface. Complemented with x-ray absorption spectroscopy, the small chemical-potential shift in core levels (∼0.2eV) are shown to be consistent with modifications of valence and conduction band states spanning the band gap (∼1eV) upon hole and electron doping in LSCO and NCCO.
- Published
- 2005
10. Evidence for Suppressed Screening on the Surface of High Temperature La2-xSrxCuO4 and Nd2-xCexCuO4 Superconductors
- Author
-
Taguchi, Munetaka, Chainani, Ashish, Horiba, Koji, Takata, Yasutaka, Yabashi, Makina, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Ishikawa, Tetsuya, Takeuchi, Tomoyuki, Yamamoto, Kazuo, Matsunami, Masaharu, Shin, Shik, Yokoya, Takayoshi, Ikenaga, Eiji, Kobayashi, Keisuke, Mochiku, Takashi, Hirata, Kazuto, Hori, Junya, Ishii, Kiyotaka, Nakamura, Fumihiko, Suzuki, Takashi, Taguchi, Munetaka, Chainani, Ashish, Horiba, Koji, Takata, Yasutaka, Yabashi, Makina, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Ishikawa, Tetsuya, Takeuchi, Tomoyuki, Yamamoto, Kazuo, Matsunami, Masaharu, Shin, Shik, Yokoya, Takayoshi, Ikenaga, Eiji, Kobayashi, Keisuke, Mochiku, Takashi, Hirata, Kazuto, Hori, Junya, Ishii, Kiyotaka, Nakamura, Fumihiko, and Suzuki, Takashi
- Abstract
Hard x-ray photoemission spectroscopy (PES) of Cu core electronic states, with a probing depth of ∼60, is used to show that the Zhang-Rice singlet feature is present in La2CuO4 but is absent in Nd2CuO4. Hole and electron doping in La2-xSrxCuO4 (LSCO) and Nd2-xCexCuO4 (NCCO) result in new well-screened features which are missing in soft x-ray PES. Impurity Anderson model calculations establish screening from doped states as its origin, which is strongly suppressed within 15 of the surface. Complemented with x-ray absorption spectroscopy, the small chemical-potential shift in core levels (∼0.2eV) are shown to be consistent with modifications of valence and conduction band states spanning the band gap (∼1eV) upon hole and electron doping in LSCO and NCCO.
- Published
- 2005
11. Valence Transition of YbInCu4 Observed in Hard X-Ray Photoemission Spectra
- Author
-
Sato, Hitoshi, Shimada, Kenya, Arita, Masashi, Hiraoka, Koichi, Kojima, Kenichi, Takeda, Yukiharu, Yoshikawa, Kunta, Sawada, Masahiro, Nakatake, Masashi, Namatame, Hirofumi, Taniguchi, Masaki, Takata, Yasutaka, Ikenaga, Eiji, Shin, Shik, Kobayashi, Keisuke, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Yabashi, Makina, Ishikawa, Tetsuya, Sato, Hitoshi, Shimada, Kenya, Arita, Masashi, Hiraoka, Koichi, Kojima, Kenichi, Takeda, Yukiharu, Yoshikawa, Kunta, Sawada, Masahiro, Nakatake, Masashi, Namatame, Hirofumi, Taniguchi, Masaki, Takata, Yasutaka, Ikenaga, Eiji, Shin, Shik, Kobayashi, Keisuke, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Yabashi, Makina, and Ishikawa, Tetsuya
- Abstract
type:text, Yb 3d and valence-band photoemission spectra of the first-order valence-transition compound YbInCu4 have been measured with hard x ray at an excitation energy of 5.95 keV. Abrupt changes are clearly observed in both spectra around the transition temperature TV = 42 K, in comparison with ultraviolet and soft x-ray photoemission (VUV-PES and SX-PES) spectra. From the Yb 3d spectra, the Yb valence has been estimated to be ~2.90 from 220 down to 50 K and ~2.74 at 30–10 K. We propose that Yb 3d hard x-ray photoemission spectroscopy is a very powerful method to estimate the valence of Yb with high accuracy. On the other hand, the Yb2+ 4f-derived peaks in the valence-band spectra exhibit a remarkable enhancement below TV. The shape of the valence-band spectra is different from those of the VUV-PES and SX-PES spectra above TV, reflecting the In 5s and 5p contributions.
- Published
- 2004
12. Valence Transition of YbInCu4 Observed in Hard X-Ray Photoemission Spectra
- Author
-
Sato, Hitoshi, Shimada, Kenya, Arita, Masashi, Hiraoka, Koichi, Kojima, Kenichi, Takeda, Yukiharu, Yoshikawa, Kunta, Sawada, Masahiro, Nakatake, Masashi, Namatame, Hirofumi, Taniguchi, Masaki, Takata, Yasutaka, Ikenaga, Eiji, Shin, Shik, Kobayashi, Keisuke, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Yabashi, Makina, Ishikawa, Tetsuya, Sato, Hitoshi, Shimada, Kenya, Arita, Masashi, Hiraoka, Koichi, Kojima, Kenichi, Takeda, Yukiharu, Yoshikawa, Kunta, Sawada, Masahiro, Nakatake, Masashi, Namatame, Hirofumi, Taniguchi, Masaki, Takata, Yasutaka, Ikenaga, Eiji, Shin, Shik, Kobayashi, Keisuke, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Yabashi, Makina, and Ishikawa, Tetsuya
- Abstract
Yb 3d and valence-band photoemission spectra of the first-order valence-transition compound YbInCu4 have been measured with hard x ray at an excitation energy of 5.95 keV. Abrupt changes are clearly observed in both spectra around the transition temperature TV = 42 K, in comparison with ultraviolet and soft x-ray photoemission (VUV-PES and SX-PES) spectra. From the Yb 3d spectra, the Yb valence has been estimated to be ~2.90 from 220 down to 50 K and ~2.74 at 30–10 K. We propose that Yb 3d hard x-ray photoemission spectroscopy is a very powerful method to estimate the valence of Yb with high accuracy. On the other hand, the Yb2+ 4f-derived peaks in the valence-band spectra exhibit a remarkable enhancement below TV. The shape of the valence-band spectra is different from those of the VUV-PES and SX-PES spectra above TV, reflecting the In 5s and 5p contributions.
- Published
- 2004
13. Evidence for Suppressed Screening on the Surface of High Temperature La2-xSrxCuO4 and Nd2-xCexCuO4 Superconductors
- Author
-
Taguchi, Munetaka, Chainani, Ashish, Horiba, Koji, Takata, Yasutaka, Yabashi, Makina, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Ishikawa, Tetsuya, Takeuchi, Tomoyuki, Yamamoto, Kazuo, Matsunami, Masaharu, Shin, Shik, Yokoya, Takayoshi, Ikenaga, Eiji, Kobayashi, Keisuke, Mochiku, Takashi, Hirata, Kazuto, Hori, Junya, Ishii, Kiyotaka, Nakamura, Fumihiko, Suzuki, Takashi, Taguchi, Munetaka, Chainani, Ashish, Horiba, Koji, Takata, Yasutaka, Yabashi, Makina, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Ishikawa, Tetsuya, Takeuchi, Tomoyuki, Yamamoto, Kazuo, Matsunami, Masaharu, Shin, Shik, Yokoya, Takayoshi, Ikenaga, Eiji, Kobayashi, Keisuke, Mochiku, Takashi, Hirata, Kazuto, Hori, Junya, Ishii, Kiyotaka, Nakamura, Fumihiko, and Suzuki, Takashi
- Abstract
Hard x-ray photoemission spectroscopy (PES) of Cu core electronic states, with a probing depth of ∼60, is used to show that the Zhang-Rice singlet feature is present in La2CuO4 but is absent in Nd2CuO4. Hole and electron doping in La2-xSrxCuO4 (LSCO) and Nd2-xCexCuO4 (NCCO) result in new well-screened features which are missing in soft x-ray PES. Impurity Anderson model calculations establish screening from doped states as its origin, which is strongly suppressed within 15 of the surface. Complemented with x-ray absorption spectroscopy, the small chemical-potential shift in core levels (∼0.2eV) are shown to be consistent with modifications of valence and conduction band states spanning the band gap (∼1eV) upon hole and electron doping in LSCO and NCCO.
14. Valence Transition of YbInCu4 Observed in Hard X-Ray Photoemission Spectra
- Author
-
Sato, Hitoshi, Shimada, Kenya, Arita, Masashi, Hiraoka, Koichi, Kojima, Kenichi, Takeda, Yukiharu, Yoshikawa, Kunta, Sawada, Masahiro, Nakatake, Masashi, Namatame, Hirofumi, Taniguchi, Masaki, Takata, Yasutaka, Ikenaga, Eiji, Shin, Shik, Kobayashi, Keisuke, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Yabashi, Makina, Ishikawa, Tetsuya, Sato, Hitoshi, Shimada, Kenya, Arita, Masashi, Hiraoka, Koichi, Kojima, Kenichi, Takeda, Yukiharu, Yoshikawa, Kunta, Sawada, Masahiro, Nakatake, Masashi, Namatame, Hirofumi, Taniguchi, Masaki, Takata, Yasutaka, Ikenaga, Eiji, Shin, Shik, Kobayashi, Keisuke, Tamasaku, Kenji, Nishino, Yoshinori, Miwa, Daigo, Yabashi, Makina, and Ishikawa, Tetsuya
- Abstract
Yb 3d and valence-band photoemission spectra of the first-order valence-transition compound YbInCu4 have been measured with hard x ray at an excitation energy of 5.95 keV. Abrupt changes are clearly observed in both spectra around the transition temperature TV = 42 K, in comparison with ultraviolet and soft x-ray photoemission (VUV-PES and SX-PES) spectra. From the Yb 3d spectra, the Yb valence has been estimated to be ~2.90 from 220 down to 50 K and ~2.74 at 30–10 K. We propose that Yb 3d hard x-ray photoemission spectroscopy is a very powerful method to estimate the valence of Yb with high accuracy. On the other hand, the Yb2+ 4f-derived peaks in the valence-band spectra exhibit a remarkable enhancement below TV. The shape of the valence-band spectra is different from those of the VUV-PES and SX-PES spectra above TV, reflecting the In 5s and 5p contributions.
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