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
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