Dislocation Defect Layer-Induced Magnetic Bi-states Phenomenon in Epitaxial La0.7Sr0.3MnO3(111) Thin Films

Yanan Zhao; Yaojin Li; Chen Chen; Guohua Dong; Shukai Zhu; Yifan Zhao; Bian Tian; Zhuangde Jiang; Ziyao Zhou; Keqing Shi; Ming Liu; Jingye Pan

doi:10.1021/acsami.1c18136

Dislocation Defect Layer-Induced Magnetic Bi-states Phenomenon in Epitaxial La_0.7Sr_0.3MnO₃(111) Thin Films

ACS Appl Mater Interfaces. 2021 Dec 15;13(49):59511-59517. doi: 10.1021/acsami.1c18136. Epub 2021 Dec 3.

Authors

Yanan Zhao¹, Yaojin Li¹, Chen Chen¹, Guohua Dong¹, Shukai Zhu¹, Yifan Zhao¹, Bian Tian², Zhuangde Jiang², Ziyao Zhou¹, Keqing Shi³, Ming Liu¹, Jingye Pan³

Affiliations

¹ Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic and Information Engineering, State Key Laboratory for Mechanical Behavior of Materials, International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University (Yantai) Research Institute For Intelligent Sensing Technology and System, Xi'an Jiaotong University, Xi'an 710049, China.
² State Key Laboratory for Manufacturing Systems Engineering, Collaborative Innovation Center of High-End Manufacturing Equipment, the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University, Xi'an 710049, China.
³ Department of Intensive Care, Precision Medicine Center Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China.

PMID: 34859661
DOI: 10.1021/acsami.1c18136

Abstract

La_0.7Sr_0.3MnO₃ (LSMO) is one of the most fascinating strongly correlated oxides in which the spin polarization and magnetic property are sensitive to strain, especially in the (111)-oriented LSMO. In the paper, epitaxial LSMO(111) thin films with different thicknesses were prepared, and they showed continuous dislocation defect arrays with thickness greater than 45 nm. Then, the thick LSMO(111) films were divided into a double-layer structure with two slightly different oriented cells. The LSMO(111) films present a stronger lattice-spin coupling, thus the double-layer structure triggers an obvious magnetic heterogeneity phenomenon (magnetic bi-states) by the way of creating a double-mode ferromagnetic resonance (FMR) spectrum. Therefore, the nanostructures, especially the ordered structure defects, may trigger enriched physical phenomena and offer new forms of spin coupling and device functionality in strain-sensitive strongly correlated oxide systems.

Keywords: La0.7Sr0.3MnO3; dislocation defect layer; ferromagnetic resonance; magnetic heterogeneity; tensile strain.