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arXiv 0810.5418cond-mat.mtrl-scicond-mat.other
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0.9BiFeO_3 - 0.1BaTiO_3多铁磁电耦合的直接证据

Direct Evidence for Multiferroic Magnetoelectric Coupling in 0.9BiFeO3-0.1BaTiO3

Anar Singh, Vibhav Pandey, R. K. Kotnala, Dhananjai Pandey

摘要:

磁性,介电和量热的研究表明,0.9BiFeO3-0.1BaTiO3强磁电耦合。XRD研究揭示了一个非常显着的变化,在菱面体的扭曲角和一个显着的移动,在磁性Tc的原子位置,由于同构相变。使用Rietveld细化的原子位置计算的极化与磁化成线性比例。我们的研究结果提供了第一个明确的证据磁电耦合的内在多铁性起源的BiFeO 3为基础的系统。

英文摘要:

Magnetic, dielectric and calorimetric studies on 0.9BiFeO3-0.1BaTiO3 indicate strong magnetoelectric coupling. XRD studies reveal a very remarkable change in the rhombohedral distortion angle and a significant shift in the atomic positions at the magnetic Tc due to an isostructural phase transition. The calculated polarization using Rietveld refined atomic positions scales linearly with magnetization. Our results provide the first unambiguous evidence for magnetoelectric coupling of intrinsic multiferroic origin in a BiFeO3 based system.

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