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铁磁性纳米带中携带横向、交变轨道角动量的自旋波模态
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Abstract:
在具有连续旋转对称性的铁磁性样品中，携带轨道角动量的自旋波其传播方向与角动量平行。在本文中，我们报告在不具有连续旋转对称性的铁磁纳米条带中，携带轨道角动量的自旋波模态。它的角动量方向不但与波的传播方向垂直，而且角动量的方向在每半个传播周期内发生一次翻转。我们的研究将微磁数值模拟与理论解析相结合，建立了携带横向轨道角动量自旋波模态的解析解，探讨了解析解的可行性。我们的工作为理解二维纳米条带中携带横向轨道角动量自旋波的拓扑特性提供了理论支持。
In ferromagnetic samples with continuous rotational symmetry, the propagation direction of the spin wave with orbital angular momentum is parallel to the angular momentum. In this paper, we report the spin wave modes with orbital angular momentum in ferromagnetic nanoribbons without continuous rotational symmetry. Its angular momentum direction is not only perpendicular to the wave propagation direction, but also reverses once in every half of the propagation cycle. In our study, the micromagnetic numerical simulation and theoretical analysis are combined to establish the analytical solution of the spin wave mode with transverse orbital angular momentum, and the feasibility of the analytical solution is discussed. Our work provides theoretical support for understanding the topological properties of spin waves with transverse orbital angular momentum in two-dimensional nanoribbons.
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