Recently, the noncollinear magnetic structure with varying Co/Zn ratios was reported in the W-type hexaferrites using neutron powder diffraction. It is believed that these noncollinear spin orderings may stimulate magnetoelectric (ME) effect in the W-type hexaferrite. Herein, we present distinct evidence of ME response through systematic investigation on the magnetic and ferroelectric properties in BaCoFe17O27. Magnetization exhibits two different anomalies at TC1 ∼ 350 K and TC2 ∼ 150 K, indicating the formation of long-range longitudinal spin configurations and the spin reorientation transition, respectively. We have found that the low field-driven electric polarization has been observed under the ME poling condition of E ⊥ (H ⊥ c, and c). Spin current mechanism is mainly considered as the physics origin in its ME response, corresponding to the other hexaferrites as reported early. In addition, the weak electric polarization observed with E(⊥c)//H(⊥c) suggests that the p–d hybridization mechanism should also be contributed to the ME response in this compound. Therefore, BaCoFe17O27 presents an intrinsic magnetoelectric effect and provides a thought for people to seek and study the more single-phase ME compounds from the viewpoint of foundational and applications.

中文翻译：

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W 型六铁素体 BaCoFe17O27 单晶中低磁场诱导的极化


最近，利用中子粉末衍射在 W 型六铁素体中报道了具有不同 Co/Zn 比的非共线磁性结构。据信，这些非共线自旋有序可能会在 W 型六铁体中激发磁电 （ME） 效应。在此，我们通过对 BaCoFe17O27 中的磁性和铁电性质的系统研究，提供了 ME 响应的明确证据。磁化强度在 TC1 ∼ 350 K 和 TC2 ∼ 150 K 处表现出两种不同的异常，分别表明长程纵向自旋构型的形成和自旋重新取向转变。我们发现，在 E ⊥ （H ⊥ c 和 c） 的 ME 极化条件下观察到低场驱动电极化。自旋电流机制主要被认为是其 ME 响应中的物理原点，对应于前面报道的其他六铁氧体。此外，用 E（⊥c）//H（⊥c） 观察到的弱极化表明 p-d 杂化机制也应该有助于该化合物中的 ME 响应。因此，BaCoFe17O27 呈现出本征磁电效应，为人们从基础和应用的角度寻找和研究更多的单相 ME 化合物提供了思路。