Magnetism manipulated by ferroelectric polarization and epitaxial strain in a La0.75Sr0.25MnO3/BaTiO3 system

Literature Information

Publication Date 2021-02-25
DOI 10.1039/D0CP05961G
Impact Factor 3.676
Authors

Dong Chen, Chun-Lei Wang


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Abstract

Exploring the manipulation of magnetism in perovskite oxides is scientifically interesting and of great technical importance in next-generation magnetic memory. Dual control of magnetism in superlattices through epitaxial strain and ferroelectric polarization may induce rich physical properties. In this work, we demonstrated a strong magnetoelectric coupling that appears in an La0.75Sr0.25MnO3/BaTiO3 superlattice. Reversible transitions in ferromagnetism, ferrimagnetism and anti-ferromagnetism, with strong magnetoelectric coupling, are achieved by precisely controlling the magnitude and spin-direction of the magnetic moments of Mn. Half-metallicity is demonstrated in the MnO2 layers, accompanied by the spin polarization of the superlattice varying from 100% to 0%. We realize the coexistence of ferroelectric polarization and metallicity, i.e., “ferroelectric metal”. The variation in strain and re-orientation of polarization lead to a change in interfacial Ti–O and Mn–O bond lengths, and hence a hybridization state, determining the magnetism of our system. The purpose-designed LSMO/BTO superlattice with intrinsic magnetoelectric coupling is a particularly interesting model system that can provide guidance for the development of spintronic devices.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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