ヤマガミ ヒロシ
YAMAGAMI HIROSHI
山上 浩志 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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言語種別 | 英語 |
発行・発表の年月 | 2016/03/21 |
形態種別 | 研究論文 |
査読 | 査読あり |
標題 | Room-temperature local ferromagnetism and its nanoscale expansion in the ferromagnetic semiconductor Ge(1-x)Fex. |
執筆形態 | その他 |
掲載誌名 | Scientific reports |
掲載区分 | 国外 |
出版社・発行元 | Springer Science and Business Media LLC |
巻・号・頁 | 6(1),pp.23295-23295 |
著者・共著者 | Yuki K Wakabayashi,Shoya Sakamoto,Yuki-haru Takeda,Keisuke Ishigami,Yukio Takahashi,Yuji Saitoh,Hiroshi Yamagami,Atsushi Fujimori,Masaaki Tanaka,Shinobu Ohya |
概要 | We investigate the local electronic structure and magnetic properties of the group-IV-based ferromagnetic semiconductor, Ge(1-x)Fex (GeFe), using soft X-ray magnetic circular dichroism. Our results show that the doped Fe 3d electrons are strongly hybridized with the Ge 4p states, and have a large orbital magnetic moment relative to the spin magnetic moment; i.e., morb/mspin ≈ 0.1. We find that nanoscale local ferromagnetic regions, which are formed through ferromagnetic exchange interactions in the high-Fe-content regions of the GeFe films, exist even at room temperature, well above the Curie temperature of 20-100 K. We observe the intriguing nanoscale expansion of the local ferromagnetic regions with decreasing temperature, followed by a transition of the entire film into a ferromagnetic state at the Curie temperature. |
DOI | 10.1038/srep23295 |
ISSN | /2045-2322 |
PMID | 26996202 |
PermalinkURL | http://www.nature.com/articles/srep23295.pdf |
researchmap用URL | http://www.nature.com/articles/srep23295 |