Large magnetoelectric response and its origin in bulk Co-doped BiFeO3 synthesized by a stirred hydrothermal process
Large magnetoelectric response and its origin in bulk Co-doped BiFeO3 synthesized by a stirred hydrothermal process
复制标题
DOI：
10.1016/j.actamat.2017.11.055
复制
发表时间：
2018-02-15
期刊：
影响因子：
9.4
通讯作者：
Megriche, Adel
中科院分区：
文献类型：
--
作者：
Marzouki, Arij;Harzali, Hassen;Megriche, Adel
在这项工作中，我们研究了Co掺杂对多铁性BiFeO 3（BFO）陶瓷的磁电（ME）响应的影响，所述多铁性BiFeO 3（BFO）陶瓷由使用搅拌水热法合成的粉末制成，所述搅拌水热法促进化学反应并有利于良好的化学均匀性和粒度分布。对于3-5%的Co掺杂，实现了高达11.3mV/（Oe.cm）的前所未有的ME系数，即比纯BFO陶瓷高8倍，这使得本体Co掺杂的BFO成为最大的单相ME材料。我们发现，Co掺杂可以被看作是一种化学压力，即代理流体静压导致尼尔反铁磁温度的增加，特别是由于磁弹性耦合的摆线磁调制的不稳定。通过抑制我们通过使用低能量拉曼光谱明确证明的摆线排列，线性ME效应不再被抑制，并且然后可以发生解释大ME响应。我们认为，机械和化学手段的组合，在搅拌水热方法，我们使用的可能是在这样的响应的起源，有利于共分布和避免寄生相，因此这样的化学路线可能会在未来进一步探索。(C)2017 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
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. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.