N
Naomi Kawamura
Researcher at Okayama University
Publications - 203
Citations - 3560
Naomi Kawamura is an academic researcher from Okayama University. The author has contributed to research in topics: Magnetic circular dichroism & X-ray magnetic circular dichroism. The author has an hindex of 27, co-authored 190 publications receiving 3225 citations.
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Journal ArticleDOI
Colossal negative thermal expansion in BiNiO3 induced by intermetallic charge transfer
Masaki Azuma,Masaki Azuma,Wei-Tin Chen,Wei-Tin Chen,Hayato Seki,Michal Czapski,Smirnova Olga,Kengo Oka,Kengo Oka,Masaichiro Mizumaki,Tetsu Watanuki,Naoki Ishimatsu,Naomi Kawamura,Shintaro Ishiwata,Shintaro Ishiwata,Matthew G. Tucker,Yuichi Shimakawa,J. Paul Attfield +17 more
TL;DR: It is reported that colossal negative thermal expansion (defined as linear expansion <−10−4 K−1 over a temperature range ~100 K) is accessible in perovskite oxides showing charge-transfer transitions.
Journal ArticleDOI
Direct observation of ferromagnetic spin polarization in gold nanoparticles.
Yoshiyuki Yamamoto,T. Miura,Motohiro Suzuki,Naomi Kawamura,Hayato Miyagawa,Tetsuya Nakamura,Keisuke Kobayashi,Toshiharu Teranishi,H. Hori +8 more
TL;DR: First direct observation of ferromagnetic spin polarization of Au nanoparticles with a mean diameter of 1.9 nm using x-ray magnetic circular dichroism (XMCD) evidences intrinsic spin polarization in nanosized gold.
Journal ArticleDOI
Direct evidence for ferromagnetic spin polarization in gold nanoparticles
Yoshihisa Yamamoto,T. Miura,Takashi Teranishi,Mikio Miyake,Hidenobu Hori,Motohiro Suzuki,Naomi Kawamura,H. Miyagawa,Tetsuya Nakamura,Keisuke Kobayashi +9 more
TL;DR: In this article, the first direct observation of ferromagnetic spin polarization of Au nanoparticles with a mean diameter of 1.9 nm using X-ray magnetic circular dichroism (XMCD) was reported.
Journal ArticleDOI
X-ray magnetic circular dichroism of size-selected, thiolated gold clusters.
Yuichi Negishi,Hironori Tsunoyama,Motohiro Suzuki,Naomi Kawamura,Michio M. Matsushita,Koichi Maruyama,Tadashi Sugawara,Toshihiko Yokoyama,Tatsuya Tsukuda +8 more
TL;DR: This finding suggests that a localized hole created by Au-S bonding at the gold/glutathione interface, rather than the quantum size effect, is responsible for the spin polarization of gold clusters.
Journal ArticleDOI
Helicity-Modulation Technique Using Diffractive Phase Retarder for Measurements of X-ray Magnetic Circular Dichroism.
Motohiro Suzuki,Naomi Kawamura,Masaichiro Mizumaki,Akiri Urata,Hiroshi Maruyama,Shunji Goto,Tetsuya Ishikawa +6 more
TL;DR: In this article, a diamond X-ray phase retarder was combined with a phase-sensitive detection method to improve the accuracy of magnetic circular dichroism (XMCD) measurements.