Effects of polar discontinuities and stacking sequences on ferromagnetic properties at La0.67Sr0.33MnO3/SrCuO2 interfaces

Author:

Zhang Jian1ORCID,Huang Haoliang23ORCID,Cui Zhangzhang3ORCID,Shan Zheling1ORCID,Wang Lenan1ORCID,Luo Yanli1ORCID,Jiang Zhongyuan1ORCID,Wang Jianlin3ORCID,Huang Qiuping3ORCID,Fu Zhengping13ORCID,Lu Yalin13ORCID

Affiliation:

1. Department of Materials Science and Engineering, University of Science and Technology of China 1 , Hefei, Anhui 230026, People's Republic of China

2. Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) 2 , Shenzhen 518045, China

3. Anhui Laboratory of Advanced Photon Science and Technology and Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China 3 , Hefei 230026, People's Republic of China

Abstract

Polar discontinuities occur in oxide heterostructures due to varying net charges in the sub-unit cell layers. These polar discontinuities lead to structural reconstruction and often create diverse functionalities. This work constructs polar discontinuous in La0.67Sr0.33MnO3/SrCuO2 (LSMO/SCO) heterostructures on a (001)-orientated SrTiO3 (STO) substrate under different configurations. By changing the growth order of LSMO and SCO, we found two different compensating mechanisms for polar discontinuity. When LSMO is grown on SCO, interfacial polarity discontinuities result in the generation of a large number of oxygen vacancies within the LSMO film. Thus, the LSMO magnetism deteriorates. For the SCO/LSMO/SCO trilayer, the SCO capping layer can recover the LSMO magnetism. The scanning transmission electron microscope results show an atomic reconstruction at the SCO-on-LSMO interface and several oxygen vacancies at the SrO sublayer. The interface reconfiguration releases the polar energy, thereby inhibiting the generation of oxygen vacancies and improving the ferromagnetism of the LSMO film. Our work studies the impact of polar discontinuity at the interface, providing insights into the effects of interface polar discontinuities on functional materials.

Funder

National Key Research and Development Program of China

Natural Science Foundation of Anhui Province

National Natural Science Foundation of China

Anhui Initiative in Quantum Information Technologies

Publisher

AIP Publishing

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