Khokhlov Nikolai E, Khramova Anastasiya E, Nikolaeva Elena P, Kosykh Tatyana B, Nikolaev Alexey V, Zvezdin Anatoly K, Pyatakov Alexander P, Belotelov Vladimir I
Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, 119991, Russia.
Russian Quantum Center, Skolkovo, Moscow, 143025, Russia.
Sci Rep. 2017 Mar 21;7(1):264. doi: 10.1038/s41598-017-00365-8.
Nowadays, spintronics considers magnetic domain walls as a kind of nanodeviсe that demands for switching much less energy in comparison to homogeneous process. We propose and demonstrate a new concept for the light control via electric field applied locally to a magnetic domain wall playing the role of nanodevice. In detail, we charged a 15-μm-thick metallic tip to generate strong non-uniform electric field in the vicinity of the domain wall in the iron garnet film. The electric field influences the domain wall due to flexomagnetoelectric effect and causes the domain wall shift. The resulting displacement of the domain wall is up to 1/3 of domain width and allows to demonstrate a novel type of the electrically controlled magneto-optical shutter. Polarized laser beam focused on the electric-field-driven domain wall was used to demonstrate the concept of a microscale Faraday modulator. We obtained different regimes of the light modulation - linear, nonlinear and tri-stable - for the same domain wall with corresponding controllable displacement features. Such variability to control of domain wall's displacement with spatial scale of about 10 μm makes the proposed concept very promising for nanophotonics and spintronics.
如今，自旋电子学将磁畴壁视为一种纳米器件，与均匀过程相比，其切换所需的能量要少得多。我们提出并演示了一种通过局部施加于扮演纳米器件角色的磁畴壁上的电场来实现光控制的新概念。具体而言，我们给一个15微米厚的金属尖端充电，以在铁石榴石薄膜中的畴壁附近产生强非均匀电场。由于挠曲磁电效应，电场会影响畴壁并导致畴壁移动。畴壁的最终位移可达畴宽度的1/3，并可用于演示一种新型的电控磁光快门。聚焦在电场驱动的畴壁上的偏振激光束被用于演示微尺度法拉第调制器的概念。对于同一个具有相应可控位移特征的畴壁，我们获得了不同的光调制模式——线性、非线性和三稳态。这种以约10微米的空间尺度控制畴壁位移的可变性使得所提出的概念在纳米光子学和自旋电子学方面非常有前景。
