气候变化领域集成服务门户(CCPortal): Amorphous nonstoichiometric oxides with tunable room-temperature ferromagnetism and electrical transport

CCPortal

DOI	10.1016/j.scib.2020.06.035
	Amorphous nonstoichiometric oxides with tunable room-temperature ferromagnetism and electrical transport
	Li Q.; Qiao R.; Mehta A.; Lü W.; Zhou T.; Arenholz E.; Wang C.; Chen Y.; Li L.; Tian Y.; Bai L.; Hussain Z.; Zheng R.; Yang W.; Yan S.
发表日期	2020
ISSN	20959273
起始页码	1718
结束页码	1725
卷号	65 期号:20
英文摘要	Material functionalities strongly depend on the stoichiometry, crystal structure, and homogeneity. Here we demonstrate an approach of amorphous nonstoichiometric inhomogeneous oxides to realize tunable ferromagnetism and electrical transport at room temperature. In order to verify the origin of the ferromagnetism, we employed a series of structural, chemical, and electronic state characterizations. Combined with electron microscopy and transport measurements, synchrotron-based grazing incident wide angle X-ray scattering, soft X-ray absorption and circular dichroism clearly reveal that the room-temperature ferromagnetism originates from the In0.23Co0.77O1−v amorphous phase with a large tunable range of oxygen vacancies. The room-temperature ferromagnetism is tunable from a high saturation magnetization of 500 emu cm−3 to below 25 emu cm−3, with the evolving electrical resistivity from 5 × 103 μΩ cm to above 2.5 × 105 μΩ cm. Inhomogeneous nano-crystallization emerges with decreasing oxygen vacancies, driving the system towards non-ferromagnetism and insulating regime. Our work unfolds the novel functionalities of amorphous nonstoichiometric inhomogeneous oxides, which opens up new opportunities for developing spintronic materials with superior magnetic and transport properties. © 2020 Science China Press
关键词	Amorphous oxide Grazing incident wide angle X-ray scattering Room-temperature ferromagnetism Soft X-ray spectroscopy
英文关键词	Crystal structure; Dichroism; Nanocrystallization; Oxygen vacancies; Saturation magnetization; X ray absorption; X ray scattering; X rays; Electronic state characterization; High-saturation magnetization; Inhomogeneous oxides; Magnetic and transport properties; Nonstoichiometric oxides; Room temperature ferromagnetism; Soft-X-ray absorption; Transport measurements; Ferromagnetism
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207104
作者单位	Spintronics Institute, University of Jinan, Jinan, 250022, China; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; SLAC National Accelerator Laboratory, Menlo Park, CA 94025, United States; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China; Cornell High Energy Synchrotron Source, Cornell University, Ithaca, NY 14853, United States; School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
推荐引用方式 GB/T 7714	Li Q.,Qiao R.,Mehta A.,et al. Amorphous nonstoichiometric oxides with tunable room-temperature ferromagnetism and electrical transport[J],2020,65(20).
APA	Li Q..,Qiao R..,Mehta A..,Lü W..,Zhou T..,...&Yan S..(2020).Amorphous nonstoichiometric oxides with tunable room-temperature ferromagnetism and electrical transport.Science Bulletin,65(20).
MLA	Li Q.,et al."Amorphous nonstoichiometric oxides with tunable room-temperature ferromagnetism and electrical transport".Science Bulletin 65.20(2020).