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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
Source PublicationJOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN0304-8853
Volume428Pages:372-376
AbstractEpitaxial 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.
description.department[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
KeywordSpin Glass State Exchange Coupling Spin Flop Coupling Exchange Bias
Subject AreaMaterials Science, Multidisciplinary ; Physics, Condensed Matter
Funding OrganizationNational Nature Science Foundation of China [51331006, 51590883, 51271177]; Chinese Academy of Sciences [KJZD-EW-M05-3]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78183
Collection中国科学院金属研究所
Corresponding AuthorLiu, W (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
Recommended Citation
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.
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