Enhanced magneto-electric effect in manganite tricolor superlattice with artificially broken symmetry

• 来源期刊: 中国物理B（英文版）
• 关键词: multiferroic magneto-electric effect superlattice
• 年，卷（期）: 2018,（9）
• 页码范围: 667-672
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/9/097701

摘要

The magneto-electric effect in magnetic materials has been widely investigated,but obtaining an enhanced magnetoelectric effect is challenging.In this study,tricolor superlattices composed of manganese oxides-Pr0.9Ca0.1MnO3,La0.9Sr0.1MnO3,and La0.9Sb0.1MnO3-on(001)-oriented Nb:SrTiO3 substrates with broken space-inversion and timereversal symmetries are designed.Regarding the electric polarization in the hysteresis loops of the superlattices at different external magnetic fields,both coercive electric field Ec and remnant polarization intensity Pr clearly show strong magneticfield dependences.At low temperatures(< 120 K),a considerable magneto-electric effect in the well-defined tricolor superlattice is observed that is absent in the single compounds.Both maxima of the magneto-electric coupling coefficients DEc and DPr appear at 30 K.The magnetic dependence of the dielectric constant further supports the magneto-electric effect.Moreover,a dependence of the magneto-electric effect on the periodicity of the superlattices with various structures is observed,which indicates the importance of interfaces.Our experimental results verify previous theoretical results regarding magneto-electric interactions,thereby paving the way for the design and development of novel magneto-electric devices based on manganite ferromagnets.