Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
Department of Electrical and Electronic Engineering, Khulna University of Engineering and Technology, Khulna, 9203, Bangladesh.
Sci Rep. 2023 Mar 24;13(1):4872. doi: 10.1038/s41598-023-31607-7.
Spin waves (SWs), an ultra-low power magnetic excitation in ferro or antiferromagnetic media, have tremendous potential as transport less data carriers for post-CMOS technology using their wave interference properties. The concept of magnon interference originates from optical interference, resulting in a historical taboo of maintaining an identical wavevector for magnon interference-based devices. This makes the attainment of on-chip design reconfigurability challenging owing to the difficulty in phase tuning via external fields. Breaking the taboo, this study explores a novel technique to systematically control magnon interference using asymmetric wavevectors from two different SW modes (magnetostatic surface SWs and backward volume magnetostatic SWs) in a microstructured yttrium iron garnet crossbar. Using this system, we demonstrate phase reconfigurability in the interference pattern by modulating the thermal landscape, modifying the dispersion of the interfering SW modes. Thus, we manifest that such a tunable interference can be used to implement reconfigurable logic gates operating between the XNOR and XOR modes by using symmetric and asymmetric interference, respectively.
自旋波（SWs）是铁磁或反铁磁介质中一种超低功耗的磁激发，具有利用其波干涉特性作为后 CMOS 技术中无载体传输数据的巨大潜力。基于磁子干涉的概念源于光学干涉，这导致在基于磁子干涉的器件中保持相同波矢成为历史禁忌。由于通过外部场进行相位调谐具有难度，这使得在芯片上实现设计的可重构性具有挑战性。本研究打破这一禁忌，探索了一种新颖的技术，即通过在微结构钇铁石榴石叉指结构中使用来自两种不同 SW 模式（静磁表面 SWs 和反向体静磁 SWs）的不对称波矢，系统地控制磁子干涉。使用该系统，我们通过调节热景观、改变干涉 SW 模式的色散，在干涉图案中实现了相位可重构性。因此，我们证明了这种可调谐干涉可以分别通过对称和不对称干涉用于实现在 XNOR 和 XOR 模式之间运行的可重构逻辑门。
