We study magneto-electric (ME) coupling mechanisms in two systems, namely ferromagnetic (FM) particles dispersed in a liquid crystal (LC) and hybrid ferroelectric (FE)–FM grains. The ME effect may appear in these systems due to the rotation of nanoparticles under the action of electric and magnetic fields. We show that a high sensitivity to the applied electric field can be achieved in both LC/magnetic particles system and hybrid FE–FM particles. In particular, even the electric field of 10 V/m essentially influences the magnetic state of these materials for proper geometric parameters. At that magnetic state, these systems can be measured in magnetic-resonance imaging (MRI) experiments. We show that MRI contrast changes up to 10% in a weak electric field. These systems can be used as MRI contrast agents for studying electrical activity in a human body.

中文翻译：

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用于使用磁共振成像检测弱电场的混合磁电材料

我们研究了两个系统中的磁电 (ME) 耦合机制，即分散在液晶 (LC) 中的铁磁 (FM) 颗粒和混合铁电 (FE)-FM 颗粒。由于纳米粒子在电场和磁场的作用下旋转，ME 效应可能出现在这些系统中。我们表明，在 LC/磁性颗粒系统和混合 FE-FM 颗粒中都可以实现对所施加电场的高灵敏度。特别是，即使是 10 V/m 的电场，也基本上会影响这些材料的磁状态以获得适当的几何参数。在这种磁性状态下，可以在磁共振成像 (MRI) 实验中测量这些系统。我们表明 MRI 对比度在弱电场中变化高达 10%。