Orientation-modulated exchange coupling in La0.67Ca0.33MnO3/CaMnO3 bilayer films

IMR OpenIR

	Orientation-modulated exchange coupling in La0.67Ca0.33MnO3/CaMnO3 bilayer films
	Wang, F.; Bai, Y.; Liu, W.; Zhang, H. R.; Li, S. K.; Dai, Z. M.; Ma, S.; Zhao, X. G.; Wang, S. C.; Wang, Z. J.; Zhang, Z. D.; Liu, W (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
	2017-04-15
发表期刊	JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN	0304-8853
卷号	428 页码:372-376
摘要	Epitaxial La0.67Ca0.33MnO3/CaMnO3 (LCMO/CMO) bilayers and the reference single layers were deposited by pulsed laser deposition on (001)-and (110)-oriented SrTiO3 (STO) substrates, allowing us to perform a detailed study of the dependence of exchange coupling on crystal orientations. It is found that the exchange bias (coercive) field of the (110)-oriented LCMO/CMO bilayer are decreased (increased) compared to that of (001)oriented bilayer, due to the enhanced (weakened) Mn3+-Mn4+ ferromagnetic double-exchange interaction of LCMO layer. It is clear that the spin flop coupling that leads to the enhanced coercivity and the spin glass state that results in the exchange bias effect can coexist and are determined by the competition between Mn3+-Mn4+ ferromagnetic double-exchange and Mn4+-Mn4+ antiferromagnetic super-exchange interactions at the interface. We propose that strong Mn3+-Mn4+ ferromagnetic double-exchange interaction facilitates the existence of spin flop coupling, not the formation of spin glass state at the LCMO/CMO interface.; Epitaxial La0.67Ca0.33MnO3/CaMnO3 (LCMO/CMO) bilayers and the reference single layers were deposited by pulsed laser deposition on (001)-and (110)-oriented SrTiO3 (STO) substrates, allowing us to perform a detailed study of the dependence of exchange coupling on crystal orientations. It is found that the exchange bias (coercive) field of the (110)-oriented LCMO/CMO bilayer are decreased (increased) compared to that of (001)oriented bilayer, due to the enhanced (weakened) Mn3+-Mn4+ ferromagnetic double-exchange interaction of LCMO layer. It is clear that the spin flop coupling that leads to the enhanced coercivity and the spin glass state that results in the exchange bias effect can coexist and are determined by the competition between Mn3+-Mn4+ ferromagnetic double-exchange and Mn4+-Mn4+ antiferromagnetic super-exchange interactions at the interface. We propose that strong Mn3+-Mn4+ ferromagnetic double-exchange interaction facilitates the existence of spin flop coupling, not the formation of spin glass state at the LCMO/CMO interface.
部门归属	[wang, f. ; bai, y. ; liu, w. ; li, s. k. ; dai, z. m. ; ma, s. ; zhao, x. g. ; wang, s. c. ; 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.] chinese acad sci, inst phys, beijing natl lab condensed matter, beijing 100190, peoples r china
关键词	Spin Glass State Exchange Coupling Spin Flop Coupling Exchange Bias
学科领域	Materials Science, Multidisciplinary ; Physics, Condensed Matter
资助者	National Nature Science Foundation of China [51331006, 51590883, 51271177]; Chinese Academy of Sciences [KJZD-EW-M05-3]
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/78183
专题	中国科学院金属研究所
通讯作者	Liu, W (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
推荐引用方式 GB/T 7714	Wang, F.,Bai, Y.,Liu, W.,et al. Orientation-modulated exchange coupling in La0.67Ca0.33MnO3/CaMnO3 bilayer films[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,2017,428:372-376.
APA	Wang, F..,Bai, Y..,Liu, W..,Zhang, H. R..,Li, S. K..,...&Liu, W .(2017).Orientation-modulated exchange coupling in La0.67Ca0.33MnO3/CaMnO3 bilayer films.JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,428,372-376.
MLA	Wang, F.,et al."Orientation-modulated exchange coupling in La0.67Ca0.33MnO3/CaMnO3 bilayer films".JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 428(2017):372-376.