Magnetic two-dimensional electron gases with high Curie temperatures at LaAlO3/SrTiO3:Fe interfaces

CORC > 金属研究所 > 中国科学院金属研究所

	Magnetic two-dimensional electron gases with high Curie temperatures at LaAlO3/SrTiO3:Fe interfaces
	Zhang, HR; Yan, X; Zhang, H; Wang, F; Gu, YD; Ning, XK; Khan, T; Li, R; Chen, YS; Liu, W
刊名	PHYSICAL REVIEW B
	2018-04-23
卷号	97 期号:15 页码:-
关键词	Zno Nanowires Magnetoresistance Ferromagnetism
ISSN号	2469-9950
英文摘要	Spin-polarized two-dimensional electron gas (2DEG) at the interface of two insulating perovskite oxides has been a focus of intensive studies in recent years. So far all attempts to construct magnetic 2DEG are based on the selection of an appropriate buffer layer or cap layer in SrTiO3-based heterostructures, and the magnetic effect thus produced on 2DEG is indirect and weak. Here, we fabricated the 2DEG based on Fe-doped SrTiO3 that is superparamagnetic rather than diamagnetic like SrTiO3. In addition to good metallicity, considerable Kondo effect, and negative magnetoresistance, the most striking observation of the present work is the occurrence of the anomalous Hall effect up to room temperature. This is transport evidence for the existence of spin-polarized 2DEG at high temperatures. As suggested by the monotonic increase of Curie temperature with carrier density, the magnetic exchange between magnetic ions could be mediated by the itinerant electrons of the 2DEG. The present work opens an avenue for the exploration of spin-polarized 2DEG.; Spin-polarized two-dimensional electron gas (2DEG) at the interface of two insulating perovskite oxides has been a focus of intensive studies in recent years. So far all attempts to construct magnetic 2DEG are based on the selection of an appropriate buffer layer or cap layer in SrTiO3-based heterostructures, and the magnetic effect thus produced on 2DEG is indirect and weak. Here, we fabricated the 2DEG based on Fe-doped SrTiO3 that is superparamagnetic rather than diamagnetic like SrTiO3. In addition to good metallicity, considerable Kondo effect, and negative magnetoresistance, the most striking observation of the present work is the occurrence of the anomalous Hall effect up to room temperature. This is transport evidence for the existence of spin-polarized 2DEG at high temperatures. As suggested by the monotonic increase of Curie temperature with carrier density, the magnetic exchange between magnetic ions could be mediated by the itinerant electrons of the 2DEG. The present work opens an avenue for the exploration of spin-polarized 2DEG.
学科主题	Physics, Condensed Matter
语种	英语
资助机构	National Basic Research of China [2016YFA0300701, 2017YFA030360]; National Natural Science Foundation of China [11520101002, 51590880, 11374348, 11674378]; Chinese Academy of Sciences
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79357]
专题	金属研究所_中国科学院金属研究所
通讯作者	Sun, JR (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter, Beijing 100190, Peoples R China.; Sun, JR (reprint author), Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.; Sun, JR (reprint author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.; Wang, SF (reprint author), Hebei Univ, Coll Phys Sci & Technol, Hebei Key Lab Opt Elect Informat & Mat, Baoding 071002, Peoples R China.
推荐引用方式 GB/T 7714	Zhang, HR,Yan, X,Zhang, H,et al. Magnetic two-dimensional electron gases with high Curie temperatures at LaAlO3/SrTiO3:Fe interfaces[J]. PHYSICAL REVIEW B,2018,97(15):-.
APA	Zhang, HR.,Yan, X.,Zhang, H.,Wang, F.,Gu, YD.,...&Wang, SF .(2018).Magnetic two-dimensional electron gases with high Curie temperatures at LaAlO3/SrTiO3:Fe interfaces.PHYSICAL REVIEW B,97(15),-.
MLA	Zhang, HR,et al."Magnetic two-dimensional electron gases with high Curie temperatures at LaAlO3/SrTiO3:Fe interfaces".PHYSICAL REVIEW B 97.15(2018):-.