Seo Dongpyo, Hwang S, Kim Byungro, Yang Yeonhee, Yoon Seungha, Cho B K
School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.
Green Energy & Nano Technology R&D Group, Korea Institute of Industrial Technology (KITECH), Gwangju, 61012, Republic of Korea.
Sci Rep. 2021 Dec 21;11(1):24385. doi: 10.1038/s41598-021-02967-9.
Asymmetric spin wave excitation and propagation are key properties to develop spin-based electronics, such as magnetic memory, spin information and logic devices. To date, such nonreciprocal effects cannot be manipulated in a system because of the geometrical magnetic configuration, while large values of asymmetry ratio are achieved. In this study, we suggest a new magnetic system with two blocks, in which the asymmetric intensity ratio can be changed between 0.276 and 1.43 by adjusting the excitation frequency between 7.8 GHz and 9.4 GHz. Because the two blocks have different widths, they have their own spin wave excitation frequency ranges. Indeed, the spin wave intensities in the two blocks, detected by the Brillouin light scattering spectrum, were observed to be frequency-dependent, yielding tuneable asymmetry ratio. Thus, this study provides a new path to enhance the application of spin waves in spin-based electronics.
非对称自旋波激发与传播是发展基于自旋的电子学（如磁存储器、自旋信息和逻辑器件）的关键特性。迄今为止，由于几何磁结构的原因，这种非互易效应在一个系统中无法被操控，尽管实现了较大的不对称率值。在本研究中，我们提出了一种由两个块体组成的新型磁系统，通过在7.8吉赫兹至9.4吉赫兹之间调节激发频率，不对称强度比可在0.276至1.43之间变化。由于这两个块体具有不同的宽度，它们有各自的自旋波激发频率范围。实际上，通过布里渊光散射光谱检测到的两个块体中的自旋波强度被观察到是频率依赖的，从而产生了可调谐的不对称率。因此，本研究为增强自旋波在基于自旋的电子学中的应用提供了一条新途径。
