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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 | 2020/02/13 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Magnetization process of the insulating ferromagnetic semiconductor (Al,Fe)Sb |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICAL REVIEW B |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 巻・号・頁 | 101(7) |
| 著者・共著者 | Shoya Sakamoto,Yosuke Nonaka,Keisuke Ikeda,Zhendong Chi,Yuxuan Wan,Masahiro Suzuki,Atsushi Fujimori,Le Duc Anh,Pham Nam Hai,Yukiharu Takeda,Yuji Saitoh,Masaki Kobayashi,Masaaki Tanaka,Yuki K. Wakabayashi,Hiroshi Yamagami |
| 概要 | We have studied the magnetization process of the new insulating ferromagnetic semiconductor (Al,Fe)Sb by means of x-ray magnetic circular dichroism. For an optimally doped sample with 10% Fe, a magnetization was found to rapidly increase at low magnetic fields and to saturate at high magnetic fields at room temperature, well above the Curie temperature of 40 K. We attribute this behavior to the existence of nanoscale Fe-rich ferromagnetic domains acting as superparamagnets. By fitting the magnetization curves using the Langevin function representing superparamagnetism plus the paramagnetic linear function, we estimated the average magnetic moment of the nanoscale ferromagnetic domain to be 300 mu B - 400 mu B and the fraction of Fe atoms participating in the nanoscale ferromagnetism to be similar to 50%. Such behavior was also reported for (In,Fe)As:Be and Ge:Fe and seems to be a universal characteristic of the Fe-doped ferromagnetic semiconductors. Further Fe doping up to 14% led to the weakening of the ferromagnetism, probably because antiferromagnetic superexchange interaction between nearest-neighbor Fe-Fe pairs becomes dominant. |
| DOI | 10.1103/PhysRevB.101.075204 |
| ISSN | 2469-9950/2469-9969 |
| PermalinkURL | https://link.aps.org/article/10.1103/PhysRevB.101.075204 |
| researchmap用URL | http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.101.075204/fulltext |