posted on 2021-12-30, 07:30authored byDi Wang, Bin He, Jinrui Guo, Nana Zhang, Chaoqun Shi, Yue Han, Qixiang Wang, Hong Fang, Jie Wang, Peng Zhang, Yanan Chen, Miaojuan Ren, Changwen Zhang, Weiming Lü
Stoichiometry offset provides a promising
platform for achieving
multifunctionality in perovskite transition metal oxide. In this work,
the electric transport and magnetic properties of LaMnO3 (LMO) films featured with varied stoichiometry offset are systematically
investigated. By applying a postannealing process with various annealing
oxygen pressures, the concentration ratio of the cation and anion
can be tuned, and the magnetic ground states such as ferromagnetic
(FM) metal and FM or antiferromagnetic (AFM) insulator of LMO can
be obtained. Additionally, a large exchange bias was also observed
by an appropriate stoichiometry control. These phenomena can be understood
by the regulable magnetic coupling of the Mn3+/Mn4+ and the magnetic phase separation. Our results provide a simple
way for achieving stoichiometry offset and a reference for the fundamental
understanding of the multiphase coexistence of manganese oxide thin
films.