High Magnetoelectric Coupling in Nano–Microscale Particulate Composites at Low Frequency
High Magnetoelectric Coupling in Nano–Microscale Particulate Composites at Low Frequency
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DOI：
10.1088/0256-307x/28/10/107503
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发表时间：
2011-09
影响因子：
3.5
通讯作者：
Yun Zhou;Miaogen Chen;Zhenjie Feng;Xinyan Wang;Yujian Cui;Jincang Zhang
中科院分区：
文献类型：
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作者：
Yun Zhou;Miaogen Chen;Zhenjie Feng;Xinyan Wang;Yujian Cui;Jincang Zhang
通过在（K0.5Na0.5）NbO 3-LiSbO 3（KNN-LS）铁电微基体中掺入分散的Ni0.98Co0.02Fe2O4（NCF）铁磁纳米颗粒，成功制备了无毒的无铅多铁性磁电复合材料。研究了NCF相含量对介电性能和直流磁化强度的影响。介电常数和介电损耗随频率的变化在低频范围内表现出频散性，且介电常数随铁氧体NCF含量的增加而减小。研究了室温下的磁电耦合效应，包括直接磁电耦合（DME）效应和逆磁电耦合（CME）效应。结果表明，NCF含量显著影响ME效应。CME和DME行为强烈依赖于驱动场频率和偏置磁场。在低频和低偏磁场下获得了高的DME和CME系数。DME和CME系数的最大值分别为197.3 ps/m（12.2 mVcm− 1 Oe −1）和314.7 ps/m。
Nontoxic lead-free multiferroic magnetoelectric composites are successfully prepared by incorporating the dispersed Ni0.98Co0.02Fe2O4 (NCF) ferromagnetic nanoparticles into a (K0.5Na0.5)NbO3-LiSbO3 (KNN-LS) ferroelectric micromatrix. The dependence of the dielectric properties and dc magnetization on NCF phase content has been studied. Variation of dielectric constant and dielectric loss with frequency show dispersion in the low frequency range, and the dielectric constants decrease with the increase in ferrite NCF content. The magnetoelectric (ME) coupling effects including direct ME (DME) and converse ME (CME) effects are investigated in detail at room temperature. The results show that the NCF content significantly affects the ME effects. The CME and DME behaviors are strongly dependent on the driving field frequency and the bias magnetic field. High DME and CME coefficients are obtained at low frequency and at low magnetic bias field. The maximum value of DME and CME coefficients are 197.3 ps/m (12.2 mVcm−1Oe−1) and 314.7 ps/m, respectively.