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arXiv · 2207.03297

Asymmetric Ground States in La$_{0.67}$Sr$_{0.33}$MnO$_3$/BaTiO$_3$ heterostructures Induced by Flexoelectric Bending

Mingqun Qi·Zhen Yang·Shengru Chen·Shan Lin·Qiao Jin·Haitao Hong·Dongke Rong·Haizhong Guo·Can Wang·Kui-juan Jin·Zhenping Wu·Er-Jia Guo
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Abstract

Misfit strain delivered from single-crystal substrates typically modifies the ground states of transition metal oxides, generating increasing interests in designing modern transducers and sensors. Here, we demonstrate that magnetotransport properties of La$_{0.67}$Sr$_{0.33}$MnO$_3$ (LSMO) films were continuously tuned by uniaxial strain produced by a home-designed bending jig. The electrical conductivity and Curie temperature of LSMO films are enhanced by bending stresses. The resistivity of a u-shape bended LSMO decays three times faster than that of a n-shape bended LSMO as a response to the same magnitude of strain. The asymmetric magnetic states in uniaxially strained LSMO are attributed to the dual actions of Jahn-Teller distortion and strain gradient mediated flexoelectric fields in an adjacent ferroelectric layer. These findings of multi-field regulation in a single material provide a feasible means for developing flexible electronic and spintronic devices.

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Mingqun Qi, Zhen Yang, Shengru Chen, Shan Lin, Qiao Jin, Haitao Hong, Dongke Rong, Haizhong Guo, Can Wang, Kui-juan Jin, Zhenping Wu, Er-Jia Guo. 2022-07-07. Asymmetric Ground States in La$_{0.67}$Sr$_{0.33}$MnO$_3$/BaTiO$_3$ heterostructures Induced by Flexoelectric Bending. https://doi.org/10.1063/5.0092134

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