Mutual control of electric and magnetic orders near room temperature in Al doped Y-type hexaferrite single crystals

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics Pub Date : 2024-04-22 DOI:10.1016/j.jmat.2024.03.012

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Abstract

Realizing robust magnetoelectric (ME) coupling effect near room temperature is still a long-standing challenge for the application of multiferroic materials in next-generation low-power spintronic and memory devices. Here we report a systematic study on the magnetic, dielectric, and ME coupling properties of Y-type hexaferrite Ba₀_.₅Sr₁_.₅Co₂Fe_12–xAl_xO₂₂ (x = 0.0, 0.5, 1.0) single crystals. The Al doping can induce the shifting of the alternating longitudinal conical (ALC)-proper screw (PS) magnetic phase transition temperature from 200 K for x = 0–365 K for x = 1.0. The most interesting feature is that the Ba₀_.₅Sr₁_.₅Co₂Fe₁₁AlO₂₂ single crystal displays a direct and converse ME coupling coefficient with $α_{H}$ ∼3,100 ps/m and $α_{E}$ ∼3,900 ps/m at 250 K, respectively, due to the Al-doped enhanced stability of ALC phase. Moreover, the exchange bias also verifies the strong coupling of electric and magnetic orders. These results provide a valuable insight on the modulation of ALC structure and the mechanism of ME effect in Y-type hexaferrites.

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掺铝 Y 型六铁氧体单晶中室温附近电阶和磁阶的相互控制

在室温附近实现稳健的磁电（ME）耦合效应仍然是多铁氧体材料应用于下一代低功耗自旋电子和存储器件的长期挑战。在此，我们报告了对 Y 型六铁氧体 Ba0.5Sr1.5Co2Fe12-xAlxO22 (x = 0.0, 0.5, 1.0) 单晶的磁性、介电和 ME 耦合特性的系统研究。铝的掺杂可以引起交变纵锥形（ALC）-正螺旋形（PS）磁相变温度的移动，从 x = 0 时的 200 K 到 x = 1.0 时的 365 K。最有趣的特征是，由于掺铝增强了 ALC 相的稳定性，Ba0.5Sr1.5Co2Fe11AlO22 单晶在 250 K 时显示出直接和相反的 ME 耦合系数，分别为 αH ∼ 3,100 ps/m 和 αE ∼ 3,900 ps/m。此外，交换偏压也验证了电阶和磁阶的强耦合。这些结果对 Y 型六元晶中 ALC 结构的调制和 ME 效应的机理提供了宝贵的见解。

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来源期刊

Journal of Materiomics Materials Science-Metals and Alloys

CiteScore

14.30

自引率

6.40%

发文量

331

审稿时长

37 days

期刊介绍： The Journal of Materiomics is a peer-reviewed open-access journal that aims to serve as a forum for the continuous dissemination of research within the field of materials science. It particularly emphasizes systematic studies on the relationships between composition, processing, structure, property, and performance of advanced materials. The journal is supported by the Chinese Ceramic Society and is indexed in SCIE and Scopus. It is commonly referred to as J Materiomics.