Exchange bias effect in epitaxial La0.67Ca0.33MnO3/SrMnO3 thin film structure

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	Exchange bias effect in epitaxial La0.67Ca0.33MnO3/SrMnO3 thin film structure
	T. Yu; X. K. Ning; W. Liu; J. N. Feng; X. G. Zhao; Z. D. Zhang
	2014
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	116 期号:8
摘要	Bilayers consisting of La0.67Ca0.33MnO3 (LCMO) and SrMnO3 (SMO) have been prepared by pulsed-laser deposition on SrTiO3 (001) substrates. Unconventional magnetic coupling was found after cooling in a small field. The LCMO/SMO bilayers exhibit an exchange bias field of 209 Oe, which vanishes as the temperature rises above 90 K. A small magnetization has been found above the Curie temperature of the pure LCMO thin films. Spin-cluster-like antiferromagnetic (AFM)/ferromagnetic (FM) clusters have been deduced to exist at the interface due to the competing types of magnetic order at the interface. The magnetic relaxation is found to follow a double-exponential equation and a slow relaxation process is observed due to the strong exchange coupling between AFM/FM clusters and the LCMO layer. We speculate that the short-range high-temperature FM order of the Mn3+ and Mn4+ moments above the Curie temperature at the interface gives rise to the magnetic regions that pin the FM LCMO layer as the temperature decreases. (C) 2014 AIP Publishing LLC.
部门归属	[yu, t. ; ning, x. k. ; liu, w. ; feng, j. n. ; zhao, x. g. ; zhang, z. d.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; liu, w (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; wliu@imr.ac.cn
关键词	Magnetic-anisotropy Ferromagnetic/antiferromagnetic Interfaces Phase-transition Cluster-glass Multilayers Bifeo3 Model
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73478
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	T. Yu,X. K. Ning,W. Liu,et al. Exchange bias effect in epitaxial La0.67Ca0.33MnO3/SrMnO3 thin film structure[J]. Journal of Applied Physics,2014,116(8).
APA	T. Yu,X. K. Ning,W. Liu,J. N. Feng,X. G. Zhao,&Z. D. Zhang.(2014).Exchange bias effect in epitaxial La0.67Ca0.33MnO3/SrMnO3 thin film structure.Journal of Applied Physics,116(8).
MLA	T. Yu,et al."Exchange bias effect in epitaxial La0.67Ca0.33MnO3/SrMnO3 thin film structure".Journal of Applied Physics 116.8(2014).