基于单纳米缺陷的自旋波反相器
Spin-wave phase inverter upon a single nanodefect
摘要：
对纳米元件磁性的局部修饰是设计下一代磁振子器件的关键，在磁振子器件中，信息通过自旋波进行携带和处理。其中最大的挑战是制作简单和微型相控元件具有广泛的可调谐性。在这里，我们成功地实现了这样的自旋波移相器上的单一纳米槽由聚焦离子束铣削在钴铁微尺寸磁振子波导。通过改变凹槽深度和面内偏置磁场，我们连续调整自旋波相位，并通过实验证明了完全的相位反转。相移的微观机制是基于纳米沟槽作为几何缺陷和较低的自旋波群速度在沟槽下的波导中的组合作用，其中由于在离子束铣削期间并入Ga离子而降低了磁化强度。所提出的移相器可以很容易地与自旋波逻辑门和其他磁振子器件进行片上集成。我们的研究结果是至关重要的设计纳米磁振子电路和自旋波纳米光学的发展。
英文摘要：
Local modification of magnetic properties of nanoelements is a key to design future-generation magnonic devices, in which information is carried and processed via spin waves. One of the biggest challenges here is to fabricate simple and miniature phase-controlling elements with broad tunability. Here, we successfully realize such spin-wave phase shifter upon a single nanogroove milled by focused ion beam in a Co-Fe microsized magnonic waveguide. By varying the groove depth and the in-plane bias magnetic field we continuously tune the spin-wave phase and experimentally evidence a complete phase inversion. The microscopic mechanism of the phase shift is based on the combined action of the nanogroove as a geometrical defect and the lower spin-wave group velocity in the waveguide under the groove where the magnetization is reduced due to the incorporation of Ga ions during the ion-beam milling. The proposed phase shifter can easily be on-chip integrated with spin-wave logic gates and other magnonic devices. Our findings are crucial for designing nano-magnonic circuits and for the development of spin-wave nano-optics.
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