Room-temperature local ferromagnetism and its nanoscale expansion in the ferromagnetic semiconductor Ge1-xFex

被引：20

作者：

Wakabayashi, Yuki K. ^{[1
]}

Sakamoto, Shoya ^{[2
]}

Takeda, Yuki-haru ^{[3
]}

Ishigami, Keisuke ^{[2
]}

Takahashi, Yukio ^{[2
]}

Saitoh, Yuji ^{[3
]}

Yamagami, Hiroshi ^{[3
,4
]}

Fujimori, Atsushi ^{[2
]}

Tanaka, Masaaki ^{[1
]}

Ohya, Shinobu ^{[1
]}

机构：

[1] Univ Tokyo, Dept Elect Engn & Informat Syst, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan

[2] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[3] Japan Atom Energy Agcy, Quantum Beam Sci Ctr, Sayo, Hyogo 6795148, Japan

[4] Kyoto Sangyo Univ, Dept Phys, Kita Ku, Kyoto 6038555, Japan

来源：

SCIENTIFIC REPORTS | 2016年 / 6卷

关键词：

MAGNETIC-PROPERTIES; EPITAXIAL-GROWTH;

D O I：

10.1038/srep23295

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We investigate the local electronic structure and magnetic properties of the group-IV-based ferromagnetic semiconductor, Ge1-xFex (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., m(orb)/m(spin) approximate to 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.

引用

页数：9

共 28 条

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