Risinggård Vetle, Kulagina Iryna, Linder Jacob
NTNU, Norwegian University of Science and Technology, Department of Physics, N-7491 Trondheim, Norway.
Sci Rep. 2016 Aug 24;6:31800. doi: 10.1038/srep31800.
We consider theoretically the effect of an inhomogeneous magnetoelectric coupling on the magnon-induced dynamics of a ferromagnet. The magnon-mediated magnetoelectric torque affects both the homogeneous magnetization and magnon-driven domain wall motion. In the domains, we predict a reorientation of the magnetization, controllable by the applied electric field, which is almost an order of magnitude larger than that observed in other physical systems via the same mechanism. The applied electric field can also be used to tune the domain wall speed and direction of motion in a linear fashion, producing domain wall velocities several times the zero field velocity. These results show that multiferroic systems offer a promising arena to achieve low-dissipation magnetization rotation and domain wall motion by exciting spin-waves.
我们从理论上考虑了非均匀磁电耦合对铁磁体中磁振子诱导动力学的影响。磁振子介导的磁电转矩会影响均匀磁化和磁振子驱动的畴壁运动。在畴内，我们预测磁化方向会发生重新取向，可通过外加电场进行控制，其幅度比通过相同机制在其他物理系统中观察到的大近一个数量级。外加电场还可用于以线性方式调节畴壁速度和运动方向，产生的畴壁速度是零场速度的几倍。这些结果表明，多铁性系统为通过激发自旋波实现低耗散磁化旋转和畴壁运动提供了一个有前景的领域。
