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Large magnetoelectric response and its origin in bulk Co-doped BiFeO 3 synthesized by a stirred hydrothermal process
Acta Materialia ( IF 9.4 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.actamat.2017.11.055
Arij Marzouki , Hassen Harzali , Vincent Loyau , Pascale Gemeiner , Karim Zehani , Brahim Dkhil , Lotfi Bessais , Adel Megriche

Abstract In this work, we study the effect of Co-doping on the magnetoelectric (ME) response of multiferroic BiFeO3 (BFO) ceramics made of powder synthesized using a stirred hydrothermal method known to facilitate chemical reactions and favor good chemical homogeneity and particles size distribution. An unprecedented ME coefficient up to 11.3 mV/(Oe.cm) i.e. 8 times higher than pure BFO ceramic, measured with a direct method is achieved for 3–5% Co-doping which makes bulk Co-doped-BFO among the largest single-phase ME materials. We show that Co-doping can be seen as a chemical pressure i.e. a proxy hydrostatic pressure resulting into an increase of Neel antiferromagnetic temperature and especially a destabilization of the cycloidal magnetic modulation because of magnetoelastic coupling. By suppressing the cycloidal arrangement that we evidenced unambiguously by using low energy Raman spectroscopy, the linear ME effect is no more inhibited and can then take place explaining the large ME response. We argue that the combination of mechanical and chemical means during the stirred hydrothermal approach we used might be at the origin of such response by favoring Co-distribution and avoiding parasitic phases and therefore such a chemical route might be further explored in the future.

中文翻译:

搅拌水热法合成块状Co掺杂BiFeO 3 的大磁电响应及其起源

摘要 在这项工作中,我们研究了 Co 掺杂对由使用搅拌水热法合成的粉末制成的多铁性 BiFeO3 (BFO) 陶瓷的磁电 (ME) 响应的影响,该方法已知促进化学反应并有利于良好的化学均匀性和粒度分布. 前所未有的 ME 系数高达 11.3 mV/(Oe.cm),即比纯 BFO 陶瓷高 8 倍,通过直接方法测量,3-5% 的共掺杂实现了,这使得块状 Co 掺杂的 BFO 成为最大的单一-相ME材料。我们表明,共掺杂可以被视为一种化学压力,即代理流体静压力,导致 Neel 反铁磁温度的增加,尤其是由于磁弹性耦合导致摆线磁调制的不稳定。通过抑制我们使用低能拉曼光谱明确证明的摆线排列,线性 ME 效应不再受到抑制,然后可以发生解释大 ME 响应。我们认为,在我们使用的搅拌水热方法中,机械和化学方法的结合可能是这种响应的起源,有利于共分布和避免寄生相,因此未来可能会进一步探索这种化学途径。
更新日期:2018-02-01
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