Positive Magneto-Electric Couplings in Epitaxial Multiferroic SrMnO3 Thin Film

IF 18.5 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Arup Kumar Mandal, Sourav Chowdhury, Shubham Kumar Parate, Akash Surampalli, Ritu Rawat, Kartick Biswas, Suryakanta Mondal, Pavan Nukala, D. M. Phase, R. J. Choudhary
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Abstract

This study demonstrates the magneto-dielectric (MD) properties of high quality epitaxially strain multiferroic SrMnO3 thin film on conducting Nb doped SrTiO3 substrate. The study observes considerable high positive MD coupling near room temperature and across the anti-ferromagnetic transition temperature of SrMnO3. The dielectric maxima of the grown film is above room temperature, which confirms the room temperature ferroelectric nature of the grown film. From out-of-plan polarization and PUND (Positive Up Negative Down) measurements in the presence of magnetic field, it is confirmed that the polarization value of grown SrMnO3 thin film increases with an increase in magnetic field. In this study, the oxygen off-stoichiometry concentration is also varied by varying oxygen partial pressure during deposition and is able to create Mn4+, Mn3+, and Mn2+ in the grown films. Despite having mixed Mn states, SrMnO3 thin films remain in the insulating phase. So, the insulating nature of SrMnO3 thin film is robust with respect to oxygen off-stoichiometry and vacancy/substrate induced strain mediated change in the crystal field. The study has also demonstrated the variation of MD in SrMnO3 thin film by change in oxygen vacancy induced modification in crystal field.

Abstract Image

Abstract Image

外延多铁SrMnO3薄膜的正磁电耦合
本研究证明了高质量外延应变多铁SrMnO3薄膜在Nb掺杂SrTiO3衬底上的磁介电性能。研究发现,在室温附近和SrMnO3的反铁磁转变温度范围内存在相当高的正MD耦合。生长膜的介电最大值在室温以上,证实了生长膜的室温铁电性质。通过在磁场作用下的计划外极化和PUND (Positive Up Negative Down)测量,证实了生长的SrMnO3薄膜的极化值随着磁场的增大而增大。在本研究中,氧的非化学计量浓度也随着沉积过程中氧分压的变化而变化,并且能够在生长的薄膜中产生Mn4+, Mn3+和Mn2+。尽管具有混合Mn态,但SrMnO3薄膜仍处于绝缘相。因此,在晶体场中,SrMnO3薄膜在氧非化学计量和空位/衬底诱导的应变介导的变化方面具有很强的绝缘性。本研究还通过晶体场中氧空位修饰的变化证明了SrMnO3薄膜中MD的变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Advanced Functional Materials
Advanced Functional Materials 工程技术-材料科学:综合
CiteScore
29.50
自引率
4.20%
发文量
2086
审稿时长
2.1 months
期刊介绍: Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.
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