Here we report a giant, completely reversible magneto–electric coupling of 100 nm polycrystalline Co layer in contact with ZnO nanorods. When the sample is under an applied bias of ±2 V, the Co magnetic coercivity is reduced by a factor 5 from the un-poled case, with additionally a reduction of total magnetic moment in Co. Taking into account the chemical properties of ZnO nanorods measured by X-rays absorption near edge spectroscopy under bias, we conclude that these macroscopic effects on the magnetic response of the Co layer are due to the microstructure and the strong strain-driven magneto–electric coupling induced by the ZnO nanorods, whose nanostructuration maximizes the piezoelectric response under bias.

中文翻译：

---

ZnO纳米棒覆盖的100 nm厚Co中的巨磁电耦合†

在这里，我们报告了与ZnO纳米棒接触的100 nm多晶Co层的巨大，完全可逆的磁电耦合。当样品处于±2 V的施加偏压下时，Co磁矫顽力与非极化情况相比降低了5倍，另外，Co中的总磁矩也降低了。考虑到ZnO纳米棒的化学性质通过在偏压下通过近边缘光谱仪的X射线吸收测量，我们得出结论，这些对Co层磁响应的宏观影响归因于ZnO纳米棒引起的微观结构和强应变驱动的磁电耦合，其纳米结构最大化偏压下的压电响应。