| 研究実績の概要 |
Magnon, which is the quanta of spin waves (SWs) is the most promising candidate for post CMOS technology. Unlike CMOS, this technology is immune to Joule heating and can encode data in both amplitude and phase. However, its application has been undermined due to lack of energy efficient control mechanism of the SWs. Therefore, I have searched for a novel energy efficient SWs control mechanism. I came up with a completely new approach to control the magnon, based on the electric field induced dynamic redox reaction. I, for the first time, proposed a new type of E-filed controlled micro structured SWs device using an organic ionic polymer (PEDOT:PSS) in the Au/PEDOT:PSS/Pt/YIG multilayer. During the investigation process I also have clarified few interesting physics for static (AIP Advances, 10, 015015 (2020), IEEE Trans. on Magnetics, 58(2), 4300706 (2022), Sci. Rep. 12, 11105 (2022)) and dynamic (Appl. Phy. Lett., 117, 152403 (2020)) control of SWs.
Furthermore, I for the first time demonstrated systematic control of magnon interference using asymmetric wavevectors from two different SW modes (magnetostatic surface SWs and backward volume magnetostatic SWs) in a microstructured ferromagnetic YIG crossbar. Using this system, I tuned the wave vectors by electrical stimulus to demonstrate phase reconfigurability in the interference pattern. We prove 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 (Sci. Rep. 13, 4872 (2023)).
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