Zhou Xiaochao, Vernier Nicolas, Agnus Guillaume, Eimer Sylvain, Lin Weiwei, Zhai Ya
School of Physics and Quantum Information Research Center, Southeast University, 211189 Nanjing, China.
Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, 91120 Palaiseau, France.
Phys Rev Lett. 2020 Dec 4;125(23):237203. doi: 10.1103/PhysRevLett.125.237203.
We have studied the nucleation of magnetic domains and propagation of magnetic domain walls (DWs) induced by pulsed magnetic field in a ferromagnetic film with in-plane uniaxial anisotropy. In contrast to observed behavior in films with out-of-plane anisotropy, the nucleated domains have a rectangular shape in which a pair of the opposite sides are perfectly linear DWs, while the other pair present zigzags. The field induced propagation of these two DW types are found to be different. The linear ones follow a creep law identical to what is usually observed in out-of-plane films, while the velocity of zigzag DWs depends linearly on the applied field amplitude down to very low field. This unexpected feature can be explained by the shape of the DW, and these results provide first experimental evidence of the applicability of the 1D model in two-dimensional ferromagnetic thin films.
我们研究了具有面内单轴各向异性的铁磁薄膜中由脉冲磁场诱导的磁畴成核和磁畴壁（DWs）的传播。与具有面外各向异性的薄膜中观察到的行为相反，成核的磁畴呈矩形，其中一对相对的边是完美的线性磁畴壁，而另一对呈现锯齿状。发现这两种类型磁畴壁的场致传播是不同的。线性磁畴壁遵循与通常在面外薄膜中观察到的相同的蠕变规律，而锯齿状磁畴壁的速度在非常低的场强下线性地依赖于外加磁场幅度。这种意外的特征可以通过磁畴壁的形状来解释，并且这些结果提供了一维模型在二维铁磁薄膜中适用性的首个实验证据。
