Enhancement of Spin Polarization in Two-Dimensional Electron Gases at Patterned LaAlO3/SrTiO3 Interfaces

doi:10.1021/acs.jpcc.2c06582

	Enhancement of Spin Polarization in Two-Dimensional Electron Gases at Patterned LaAlO3/SrTiO3 Interfaces
	Chen, Yongda 6; Liu, Ruxin 6; Zhang, Xu 6; Zhuang, Wenzhuo 6; Zhang, Chong 6; Niu, Wei 3,6; Zhang, Chunchen 1; Wang, Peng 1; Yan, Wensheng 7; Pi, Li 2
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2022-11-01
ISSN号	1932-7447
DOI	10.1021/acs.jpcc.2c06582
通讯作者	Niu, Wei(weiniu@njupt.edu.cn) ; Wang, Xuefeng(xfwang@nju.edu.cn)
英文摘要	Spin-polarized two-dimensional electron gases (2DEGs) at the interfaces of SrTiO3-based correlated oxides have attracted tremendous attention in electronics and spintronics. Hitherto, the transition temperature (TC) for such spin polarization remains very low at around 20 K, seriously restricting further spin-based applications. Here, we demonstrate a new strategy to greatly enhance the spin polarization at the interfaces of the prototypical LaAlO3/SrTiO3 by conveniently inserting a SrCoO2.5-patterned Hall-bar layer. In the modified interfacial heterostructure, signatures of spin polarization, such as the Kondo effect, hysteretic magnetoresistance, magnetic hysteresis loop, and anomalous Hall effect, are all unambiguously observed. The TC of spin polarization deduced from the anomalous Hall effect is promoted to a significantly high temperature of 100 K, much higher than any reported values for 2DEGs at oxide interfaces. Combining atomic-level resolution electron energy-loss spectroscopy, X-ray absorption spectroscopy, and X-ray magnetic circular dichroism spectroscopy, the origin of spin polarization is attributed to the occurrence of Ti3+ ions located around the interfaces. This work opens up a reliable interfacial engineering route to enhance the spin polarization in 2DEGs at oxide interfaces, which is applicable for practical spin-based logic and memory devices.
资助项目	National Key R&D Program of China[2022YFA1402404] ; National Natural Science Foundation of China[62274085] ; National Natural Science Foundation of China[11874203] ; National Natural Science Foundation of China[61822403] ; National Natural Science Foundation of China[11904174] ; Natural Science Foundation of Jiangsu Province[BK20190729] ; Fundamental Research Funds for the Central Universities[021014380080] ; Micro-Fabrication and Integration Technology Center of Nanjing University
WOS关键词	SUPERCONDUCTIVITY ; FERROMAGNETISM ; COEXISTENCE ; RESISTANCE ; CONVERSION
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000879865500001
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Natural Science Foundation of Jiangsu Province ; Fundamental Research Funds for the Central Universities ; Micro-Fabrication and Integration Technology Center of Nanjing University
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/130367]
专题	中国科学院合肥物质科学研究院
通讯作者	Niu, Wei; Wang, Xuefeng
作者单位	1.Nanjing Univ, Coll Engn & Appl Sci, Nanjing 210093, Peoples R China 2.Chinese Acad Sci, High Magnet Field Lab, Hefei 230031, Peoples R China 3.Nanjing Univ, Sch Phys, Nanjing 210093, Peoples R China 4.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China 5.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China 6.Nanjing Univ, Sch Elect Sci & Engn, Jiangsu Prov Key Lab Adv Photon & Elect Mat, Nanjing 210093, Peoples R China 7.Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China
推荐引用方式 GB/T 7714	Chen, Yongda,Liu, Ruxin,Zhang, Xu,et al. Enhancement of Spin Polarization in Two-Dimensional Electron Gases at Patterned LaAlO3/SrTiO3 Interfaces[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2022.
APA	Chen, Yongda.,Liu, Ruxin.,Zhang, Xu.,Zhuang, Wenzhuo.,Zhang, Chong.,...&Wang, Xuefeng.(2022).Enhancement of Spin Polarization in Two-Dimensional Electron Gases at Patterned LaAlO3/SrTiO3 Interfaces.JOURNAL OF PHYSICAL CHEMISTRY C.
MLA	Chen, Yongda,et al."Enhancement of Spin Polarization in Two-Dimensional Electron Gases at Patterned LaAlO3/SrTiO3 Interfaces".JOURNAL OF PHYSICAL CHEMISTRY C (2022).