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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引用次数: 0
摘要
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。
Magnetic-Field Controllable Displacement-Type Ferroelectricity Driven by Off-Center Fe2+ Ions in CaFe3Ti4O12 Perovskite
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 TC ≈107 and TN ≈ 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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