Lei Guo, Guopeng Shi, Guocai Wang, Hua Su, Huaiwu Zhang, Xiaoli Tang
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引用次数: 0
摘要
反铁磁体因其在小规模和低功耗器件方面的优越性,成为下一代自旋电子器件的竞争候选器件。在铁磁(FM)/反铁磁(AFM)系统中,由自旋轨道力矩(SOT)驱动的磁化和交换偏置(EB)的电操纵已成为自旋电子学的重点。本文报告了在 Co/IrMn 系统中实现大垂直 EB 场以及在 Pt/Co/IrMn 系统中通过 SOT 有效操纵磁性 Co 层的磁矩和 EB 场的情况。在 SOT 驱动的开关过程中,观察到一种不对称的操纵状态。振幅相同但方向相反的电流脉冲会诱发不同的磁化状态。磁光克尔测量结果表明,这是由于 AFM 中稳定和瞬变反铁磁畴共存所致。利用这些 FM/AFM 结构的不对称特性,通过 SOT 在单个单元中实现了五个自旋逻辑门,即 AND、OR、NOR、NAND 和 NOT。这项研究深入揭示了 SOT 在原子力显微镜上的特殊能力,也为构建基于原子力显微镜自旋电子系统的内存逻辑和神经形态计算单元铺平了道路。
Asymmetric Manipulation of Perpendicular Exchange Bias and Programmable Spin Logical Cells by Spin–Orbit Torque in a Ferromagnet/Antiferromagnet System
Antiferromagnets are competitive candidates for the next generation of spintronic devices owing to their superiority in small-scale and low-power-consumption devices. The electrical manipulation of the magnetization and exchange bias (EB) driven by spin-orbit torque (SOT) in ferromagnetic (FM)/antiferromagnetic (AFM) systems has become focused in spintronics. Here, the realization of a large perpendicular EB field in Co/IrMn and the effective manipulation of the magnetic moments of the magnetic Co layer and EB field by SOT in Pt/Co/IrMn system is reported. During the SOT-driven switching process, an asymmetrically manipulated state is observed. Current pulses with the same amplitude but opposite directions induce different magnetization states. Magneto–optical Kerr measurements reveal that this is due to the coexistence of stable and metastable antiferromagnetic domains in the AFM. Exploiting the asymmetric properties of these FM/AFM structures, five spin logic gates, namely AND, OR, NOR, NAND, and NOT, are realized in a single cell via SOT. This study provides an insight into the special ability of SOT on AFMs and also paves an avenue to construct the logic-in-memory and neuromorphic computing cells based on the AFM spintronic system.
期刊介绍:
Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.