Department of Materials Science and Engineering, College of Engineering, Peking University, 100871, Beijing, China.
Adv Mater. 2017 May;29(19). doi: 10.1002/adma.201606022. Epub 2017 Mar 3.
Bulk-magnetoelectric (ME) composites consisting of various piezoelectric and piezomagnetic materials with (3-0), (3-1), (2-2), and (2-1) connectivity are proposed in a bid to realize strong ME coupling for next-generation electronic-device applications. Here, 1D (1-1) connectivity ME composites consisting of a [011]-oriented Pb(Mg,Nb)O -PbTiO (PMN-PT) single-crystal fiber laminated with laser-treated amorphous FeBSi alloy (Metglas) and operating in L-T mode (longitudinally magnetized and transversely poled) are reported, which exhibit an enhanced resonant ME coupling coefficient of ≈7000 V cm Oe , which is nearly seven times higher than the best result published previously, and also a superhigh magnetic sensitivity of 1.35 × 10 T (directly detected) at resonance at room temperature, representing a significant advance in bulk magnetoelectric materials. The theoretical analyses based on magnetic-circuit and equivalent-circuit methods show that the enhancement in ME coupling can be attributed to the reduction in resonance loss of laser-treated Metglas alloy due to nanocrystallization and the strong magnetic-flux-concentration effect in (1-1) configuration composites.
本文提出了由具有（3-0）、（3-1）、（2-2）和（2-1）连接的各种压电和压磁材料组成的块状磁电（ME）复合材料，以期为下一代电子设备应用实现强 ME 耦合。在这里，报道了一种由[011]取向的 Pb(Mg,Nb)O-PbTiO（PMN-PT）单晶纤维与经过激光处理的非晶态 FeBSi 合金（Metglas）层压而成的一维（1-1）连接 ME 复合材料，其工作模式为 L-T 模式（纵向磁化和横向极化），表现出增强的共振 ME 耦合系数约为 7000 V cm Oe，比之前报道的最好结果高出近 7 倍，在室温共振时还具有超高的磁灵敏度 1.35×10 T（直接检测），这是块状磁电材料的重大进展。基于磁路和等效电路方法的理论分析表明，ME 耦合的增强可归因于激光处理 Metglas 合金由于纳米晶化导致的共振损耗降低以及（1-1）结构复合材料中的强磁通集中效应。
