Oxygen-vacancy-controlled magnetic properties with magnetic pole inversion in BiFeO3-based multiferroics |
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Authors: | Run Liu Zihan Wang Silu Peng Jian Bi Jiangtao Wu Zuo-Guang Ye |
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Affiliation: | 1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, China;2. Department of Chemistry & 4D LABS, Simon Fraser University, Burnaby, BC, Canada |
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Abstract: | Oxygen vacancies which are generally present in ferrite oxide may significantly affect their magnetic properties. A comprehensive understanding of the relationship between oxygen vacancies and magnetism is of great importance. In this work, we report an oxygen vacancy concentration dependence of magnetism in a single-phase multiferroic BiFeO3 (BFO)-based system. The BiFeO3-DyFeO3 (BDFO) solid solution is synthesized with controlled oxygen vacancies and is characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and AC impedance spectroscopy. The magnetic properties, especially magnetic pole inversion, are found to be highly dependent on oxygen vacancy concentration. The oxygen vacancies generate a Weiss molecular field on the Dy3+ ions in the magnetic field range of 570-1000 Oe depending on the oxygen vacancy concentration, and result in a residual net magnetization by breaking the balance between the two nearly antiparallel spin lattices of Fe3+ ions. This work demonstrates an effective way to control oxygen vacancies and thereby the magnetic properties and sheds light on the relationship between oxygen vacancies and magnetism in BFO-based multiferroics. |
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Keywords: | bismuth ferrite BiFeO3 magnetic pole inversion oxygen vacancies |
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