Chen Jun, Dong Shuai
School of Physics, Southeast University, Nanjing 211189, China.
Phys Rev Lett. 2021 Mar 19;126(11):117603. doi: 10.1103/PhysRevLett.126.117603.
Controlling magnetism using voltage is highly desired for applications, but remains challenging due to a fundamental contradiction between polarity and magnetism. Here, we propose a mechanism to manipulate magnetic domain walls in ferrimagnetic or ferromagnetic multiferroics using the electric field. Different from those studies based on static domain-level couplings, here the magnetoelectric coupling relies on the collaborative spin dynamics around domain walls. Accompanying the reversal of spin chirality driven by polarization switching, a "rolling-downhill"-like motion of the domain wall is achieved in nanoscale, which tunes the magnetization locally. Our mechanism opens an alternative route to the pursuit of practical and fast converse magnetoelectric functions via spin dynamics.
利用电压控制磁性在实际应用中备受期待，但由于极性与磁性之间的根本矛盾，这一目标仍具挑战性。在此，我们提出一种利用电场操纵亚铁磁或铁磁多铁性材料中磁畴壁的机制。与基于静态畴级耦合的研究不同，这里的磁电耦合依赖于畴壁周围的协同自旋动力学。伴随极化切换驱动的自旋手性反转，在纳米尺度上实现了磁畴壁的“滚下山坡”式运动，从而局部调节磁化强度。我们的机制为通过自旋动力学实现实用且快速的逆磁电功能开辟了一条新途径。
