Otxoa Rubén M, Tatara Gen, Roy Pierre E, Chubykalo-Fesenko Oksana
Hitachi Cambridge Laboratory, J. J. Thomson Avenue, Cambridge, CB3 OHE, UK.
Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018, San Sebastián, Spain.
Sci Rep. 2023 Nov 30;13(1):21153. doi: 10.1038/s41598-023-47662-z.
Soliton-based computing relies on their unique properties for transporting energy and emerging intact from head-on collisions. Magnetic domain walls are often referred to as solitons disregarding the strict mathematical definition requiring the above scattering property. Here we demonstrate the conditions of elastic and inelastic scattering for spin-orbit torque-induced dynamics of relativistic domain walls on the technologically relevant Mn[Formula: see text]Au antiferromagnetic material. We show that even domain walls with opposite winding numbers can experience elastic scattering and we present the corresponding phase diagram as a function of the spin-orbit field strength and duration. The elastic collision requires minimum domain walls speed, which we explain assuming an attractive potential created by domain wall pair. On the contrary, when the domain walls move at lower speeds, their collision is inelastic and results in a dispersing breather. Our findings will be important for the development of soliton-based computing using antiferromagnetic spintronics and we discuss their prospects for building NOT and XOR gates.
基于孤子的计算依赖于它们在传输能量以及在正面碰撞中完好无损地出现时所具有的独特性质。磁畴壁通常被称为孤子，而忽略了要求具备上述散射特性的严格数学定义。在此，我们展示了在技术上相关的Mn[公式：见原文]Au反铁磁材料上，自旋轨道扭矩诱导的相对论性畴壁动力学的弹性和非弹性散射条件。我们表明，即使具有相反缠绕数的畴壁也能经历弹性散射，并且我们给出了作为自旋轨道场强和持续时间函数的相应相图。弹性碰撞需要最小的畴壁速度，我们假设由畴壁对产生的吸引势来对此进行解释。相反，当畴壁以较低速度移动时，它们的碰撞是非弹性的，并导致一个色散呼吸子。我们的发现对于使用反铁磁自旋电子学的基于孤子的计算发展将具有重要意义，并且我们讨论了它们构建非门和异或门的前景。
