2Dimensional van der Waals Spin-Orbit Torque Technology

通过结合最好的不同功能组分来设计二维(2D)材料范德瓦尔斯异质结构可以在纳米电子学中提供大量的机会。在这里，我们计划开发基于2D磁性和拓扑自旋轨道材料的全2D自旋电子学平台，用于下一代信息技术。这些混合系统可以在自旋电子学和2D材料之间提供强大的协同作用，目标是将两个世界的最佳结合在一起。这种2D异质结构中自旋轨道物理和磁性的结合将使全2D自旋轨道扭矩(SOT)技术具有突破性的功能，用于低功耗和非易失性存储和逻辑器件。我们将利用层状自旋轨道材料(SOM)的低晶体对称性，提供新的自旋织构，实现高效的电荷到自旋转换(CSC)，并为SOT技术提供显著的面外自旋轨道场贡献。我们将在石墨烯异质结构的非局域自旋阀几何结构中使用电位法对CSC进行基础研究。这些研究将提供有关CSC现象的主要驱动机制的信息，例如自旋霍尔、Rashba-Edelstein或其他自旋-动量锁定效应，以产生巨大的可调自旋极化。另一方面，磁性2D晶体表现出广泛的磁性有序，并具有通过纯电子手段控制的潜力。在这里，我们将研究用于SOT技术的2D磁体，利用它们的低维、垂直磁各向异性和电场控制的可能性。我们将研究磁激励的动力学，它们的各向异性，以及门的可控性，这些都是影响磁开关速度的关键参数。这个项目将把2D磁体和SOM与工程接口集成在一起，在全2D材料平台上建立异常高效的SOT开关功能。我们的目标是利用电学、磁输运、时间和空间分辨磁光、铁磁共振和二次谐波测量来研究混合结构的磁化动力学和SOT开关行为的基本原理。这些异质结构中新功能的潜力将来自于2D材料界面上奇异的自旋织构、磁性相、邻近诱导的交换和自旋轨道效应的相互作用。

Engineering two-dimensional (2D) material van der Waals heterostructures by combining the best of different functional constituents can offer a plethora of opportunities in nanoelectronics. Here, we propose to develop all-2D spintronics platforms for the next generation of information technology based on 2D magnetic and topological spin-orbit materials. These hybrid systems can provide a strong synergy between spintronics and 2D materials, with the goal of combining “the best of both worlds”. Such integration of spin-orbit physics and magnetism in 2D heterostructures will enable groundbreaking functionalities in all-2D spin-orbit torque (SOT) technologies for low-power and non-volatile memory and logic devices.We will exploit low crystal symmetry of layered spin-orbit materials (SOM), hosting novel spin textures for the realization of efficient charge-to-spin conversion (CSC) with a significant out-of-plane spin-orbit field contribution for SOT technologies. We will start with basic investigation of CSC by using potentiometric methods in non-local spin valve geometry with graphene heterostructures. These studies will provide information about the main driving mechanisms of the CSC phenomena, such as the spin Hall, Rashba-Edelstein, or other spin-momentum locking effects to generate a giant and tunable spin polarization. Magnetic 2D crystals, on the other hand, exhibit a wide range of magnetic ordering and, extraordinarily, have the potential to be controlled by purely electronic means. Here, we will investigate 2D magnets for SOT technologies exploiting their low-dimensionality, perpendicular magnetic anisotropy, and the possibility of electric field control. We will examine the dynamics of magnetic excitations, their anisotropies, and controllability by gates, the critical parameters influencing the magnetic switching speed.This project will integrate 2D magnets and SOMs with engineered interfaces to establish exceptionally efficient SOT switching functionalities in all-2D materials platforms. We aim to study the fundamentals of magnetization dynamics and SOT switching behavior of hybrid structures using electronic, magnetotransport, time and spatially resolved magneto-optics, ferromagnetic resonance and 2nd harmonic measurements. The potential of the novel functionalities in these heterostructures will arise from the interplay of exotic spin textures, magnetic phases, proximity-induced exchange and spin-orbit effects at the interfaces of the 2D materials.