Magnetic-Field Controllable Displacement-Type Ferroelectricity Driven by Off-Center Fe2+ Ions in CaFe3Ti4O12 Perovskite

IF 18.5 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Advanced Functional Materials Pub Date : 2024-08-16 DOI:10.1002/adfm.202411133

Dabiao Lu, Denis Sheptyakov, Yingying Cao, Haoting Zhao, Jie Zhang, Maocai Pi, Xubin Ye, Zhehong Liu, Xueqiang Zhang, Zhao Pan, Xingxing Jiang, Zhiwei Hu, Yi-feng Yang, Pu Yu, Youwen Long

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Abstract

Displacement-type ferroelectrics usually exclude magnetic d-electron contribution. Applying a magnetic field thus can little change the electric polarization. Herein, a magnetic ionic driven displacement-type perovskite ferroelectric CaFe₃Ti₄O₁₂ is reported. In this compound, magnetic Fe²⁺ ions contribute to both ferroelectric and antiferromagnetic orders respectively at T_C ≈107 and T_N ≈ 3.1 K, resulting in coupled electric and magnetic domains. A moderate magnetic field can induce a metamagnetic transition toward ferromagnetic correlations. External magnetic fields can thus readily tune the magnetic and the joint ferroelectric domains, giving rise to exceptional magnetic-field controllable displacement-type polarization with a large magnetoelectric (ME) coupling coefficient. This study opens up a new avenue to find unprecedented ME effects in displacement-type ferroelectrics for numerous applications.

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CaFe3Ti4O12 包晶石中偏心 Fe2+ 离子驱动的磁场可控位移型铁电性

位移型铁电通常不包括磁性 d 电子的贡献。因此，施加磁场几乎不会改变电极化。本文报告了一种磁性离子驱动的位移型包晶铁电体 CaFe3Ti4O12。在该化合物中，磁性 Fe2+ 离子分别在 TC ≈107 和 TN ≈ 3.1 K 时对铁电阶和反铁磁阶起作用，从而形成耦合的电畴和磁畴。适度的磁场可诱导向铁磁关联的元磁转变。因此，外部磁场可以轻易地调节磁畴和铁电耦合畴，从而产生具有较大磁电（ME）耦合系数的特殊磁场可控位移型极化。这项研究为在位移型铁电体中发现前所未有的 ME 效应开辟了一条新途径，可应用于多种领域。

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来源期刊

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.