Oxygen vacancy formation, crystal structures, and magnetic properties of three SrMnO3-delta films

IMR OpenIR

	Oxygen vacancy formation, crystal structures, and magnetic properties of three SrMnO3-delta films
	Wang, F; Zhang, YQ; Bai, Y; Liu, W; Zhang, HR; Wang, WY; Li, SK; Ma, S; Zhao, XG; Sun, JR; Wang, ZH; Wang, ZJ; Zhang, ZD; Liu, W (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
	2016-08-01
发表期刊	APPLIED PHYSICS LETTERS
ISSN	0003-6951
卷号	109 期号:5
摘要	The crystal structures and magnetic properties of the 40 nm brownmillerite SrMnO2.5 film, perovskite SrMnO3-delta film, and mixed-phase film have been systematically investigated. The features of the oxygen vacancy ordering superstructure in the brownmillerite SrMnO2.5 film are observed from HRSTEM as follows: the dark stripes with a periodicity of four (110) planes of the cubic perovskite appearing at an angle of 45 degrees with the substrate-film interface and extra reflection spots in fast Fourier transformation patterns along the (001) plane. When annealing the brownmillerite SrMnO2.5 film under higher oxygen pressure, the top portion undergoes structure transition into perovskite SrMnO3-delta as seen in the mixed-phase film consisting of the perovskite SrMnO3-delta phase dominating at the top part and the brownmillerite SrMnO2.5 phase dominating at the bottom part. The magnetic properties and Mn valences of the brownmillerite SrMnO2.5 film indicate that this film, similar to the bulk, is antiferromagnetic with TN at 375 K. However, the strained tetragonal perovskite SrMnO3-delta film exhibits ferromagnetic behavior with Curie temperature at 75K and a saturation magnetization of 2.5 mu(B)/Mn at 2 K. Moreover, the top perovskite SrMnO3-delta phase of the mixed-phase film also exhibits ferromagnetic behavior evidenced by the existence of the exchange bias. We propose that the ferromagnetic properties in both the perovskite SrMnO3-delta film and the top perovskite SrMnO3-delta phase in the mixed-phase film originate from Mn3+-Mn4+ double exchange coupling. However, the formation of Mn3+ differs for the two samples in that it is caused by oxygen vacancies in the former and the distribution of oxygen content across the film during annealing in the latter. Published by AIP Publishing.
部门归属	[wang, f. ; zhang, y. q. ; bai, y. ; liu, w. ; wang, w. y. ; li, s. k. ; ma, s. ; zhao, x. g. ; wang, z. h. ; wang, z. j. ; zhang, z. d.] chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china ; [zhang, h. r. ; sun, j. r.] chinese acad sci, beijing natl lab condensed matter, inst phys, beijing 100190, peoples r china
学科领域	Physics, Applied
资助者	National Nature Science Foundation of China [51331006, 51590883, 51271177, 11520101002]; Chinese Academy of Sciences [KJZD-EW-M05-3]
收录类别	sci
语种	英语
WOS记录号	WOS:000383091400023
引用统计	被引频次：41[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/76315
专题	中国科学院金属研究所
通讯作者	Liu, W (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
推荐引用方式 GB/T 7714	Wang, F,Zhang, YQ,Bai, Y,et al. Oxygen vacancy formation, crystal structures, and magnetic properties of three SrMnO3-delta films[J]. APPLIED PHYSICS LETTERS,2016,109(5).
APA	Wang, F.,Zhang, YQ.,Bai, Y.,Liu, W.,Zhang, HR.,...&Liu, W .(2016).Oxygen vacancy formation, crystal structures, and magnetic properties of three SrMnO3-delta films.APPLIED PHYSICS LETTERS,109(5).
MLA	Wang, F,et al."Oxygen vacancy formation, crystal structures, and magnetic properties of three SrMnO3-delta films".APPLIED PHYSICS LETTERS 109.5(2016).