Magnetization Dynamics of Domain Walls in Cylindrical Nanowires

IF 0.8 4区综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-06-19 DOI:10.1007/s40010-023-00831-1

M. S. Devapriya, Kartick Biswas, Chandrasekhar Murapaka, Arabinda Haldar

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Abstract

Domain walls in cylindrical nanowires exhibit several intriguing properties making them suitable for spintronic applications. Here, we report the microwave response of domain walls in cylindrical nanowires using micromagnetic simulations. The domain walls exhibit two kinds of reversal modes, namely vortex reversal mode and transverse reversal mode. The present study is confined to the sub-50-nm-diameter cylindrical nanowires, where the transverse domain wall is a stable configuration. The microwave properties are highly dependent on demagnetizing fields that exist along the nanowire. Two well distinguishable modes are observed in the nanowires, one that arises from the domain wall and the other due to the inhomogeneities at the edges. Both modes are found to be sensitive to the diameter of the cylindrical nanowire. The results reveal additional functionality of the DWs in cylindrical nanowires based on high-frequency spin dynamics for microwave applications.

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圆柱形纳米线畴壁的磁化动力学

圆柱形纳米线中的畴壁表现出几个有趣的特性，使它们适合自旋电子应用。在这里，我们报道了用微磁模拟的圆柱形纳米线畴壁的微波响应。畴壁呈现两种反转模式，即涡旋反转模式和横向反转模式。目前的研究仅限于直径小于50纳米的圆柱形纳米线，其中横向畴壁是一种稳定的结构。微波特性高度依赖于沿纳米线存在的退磁场。在纳米线中观察到两种很好区分的模式，一种是由畴壁产生的，另一种是由于边缘的不均匀性引起的。发现这两种模式对圆柱形纳米线的直径都很敏感。结果揭示了基于微波应用的高频自旋动力学的圆柱形纳米线中的DWs的附加功能。

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