Electric manipulation of magnetic properties is a key problem of materials research. To fulfill the requirements of modern electronics, these processes must be shifted to high frequencies. In multiferroic materials, this may be achieved by electric and magnetic control of their fundamental excitations. Here we identify magnetic vibrations in multiferroic iron borates that are simultaneously sensitive to external electric and magnetic fields. Nearly 100% modulation of the terahertz radiation in an external field is demonstrated for ${\mathrm{SmFe}}_3{({\mathrm{BO}}_3)}_4$. High sensitivity can be explained by a modification of the spin orientation that controls the excitation conditions in multiferroic borates. These experiments demonstrate the possibility to alter terahertz magnetic properties of materials independently by external electric and magnetic fields.

中文翻译：

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多铁硼酸盐中的电场和磁场对磁振子的转换

磁性能的电操纵是材料研究的关键问题。为了满足现代电子技术的要求，必须将这些过程转移到高频。在多铁性材料中，这可以通过对其基本激励进行电磁控制来实现。在这里，我们确定了多铁性硼酸铁中的磁场振动，这些振动同时对外部电场和磁场敏感。演示了在外场中对太赫兹辐射进行近100％的调制${\mathrm{m铁}}_3{（{\mathrm{BO}}_3）}_4$。可以通过控制自旋取向的修改来解释高灵敏度，该自旋取向控制了多铁硼酸盐中的激发条件。这些实验证明了通过外部电场和磁场独立改变材料的太赫兹磁性能的可能性。