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Title: Enhanced Magnetic Anisotropy and Orbital Symmetry Breaking in Manganite Heterostructures
Authors: Chen, Pingfan 
Huang, Zhen 
Li, Mengsha
Yu, Xiaojiang 
Wu, Xiaohan
Li, Changjian 
Bao, Nina 
Zeng, Shengwei 
Yang, Ping 
Qu, Lili
Chen, Jingsheng 
Ding, Jun 
Pennycook, Stephen John 
Wu, Wenbin
Venkatesan, Thirumalai Venky 
Ariando, A. 
Chow, Gan Moog 
Keywords: crystal field
magnetic anisotropy
manganite heterostructures
orbital hybridization
orbital symmetry breaking
Issue Date: 19-Dec-2019
Publisher: Wiley-VCH Verlag
Citation: Chen, Pingfan, Huang, Zhen, Li, Mengsha, Yu, Xiaojiang, Wu, Xiaohan, Li, Changjian, Bao, Nina, Zeng, Shengwei, Yang, Ping, Qu, Lili, Chen, Jingsheng, Ding, Jun, Pennycook, Stephen John, Wu, Wenbin, Venkatesan, Thirumalai Venky, Ariando, A., Chow, Gan Moog (2019-12-19). Enhanced Magnetic Anisotropy and Orbital Symmetry Breaking in Manganite Heterostructures. ADVANCED FUNCTIONAL MATERIALS. ScholarBank@NUS Repository.
Abstract: Manipulating magnetic anisotropy in complex oxide heterostructures has attracted much attention. Here, three interface-engineering approaches are applied to address two general issues with controlling magnetic anisotropy in the La2/3Sr1/3MnO3 heterostructure. One is the paradox arising from the competition between Mn3d�O2p orbital hybridization and MnO6 crystal field. The other is the interfacial region where the nonuniform Mn?O bond length d and Mn?O?Mn bond angle ? disturb the structural modulation. When the interfacial region is suppressed in the interface-engineered samples, the lateral magnetic anisotropy energy is increased eighteen times. The d-mediated anisotropic crystal filed that overwhelms the orbital hybridization causes the lateral symmetry breaking of the Mn 3dx 2 ? y 2 orbital, resulting in enhanced magnetic anisotropy. This is different from the classic Jahn�Teller effect where the lateral symmetry is always preserved. Moreover, the quantitative analysis on X-ray linear dichroism data suggests a direct correlation between Mn 3dx 2 ? y 2 orbital symmetry breaking and magnetic anisotropy energy. The findings not only advance the understanding of magnetic anisotropy in manganite heterostructures but also can be extended to other complex oxides and perovskite materials with correlated degrees of freedom. � 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN: 1616-301X
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