Modulation of magnonic bands of dipole-exchange spin waves in fishbone-like yttrium iron garnet nanostrip magnonic crystal waveguides

Modulation of magnonic bands of dipole-exchange spin waves in fishbone-like yttrium iron garnet nanostrip magnonic crystal waveguides
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鱼骨状钇铁石榴石纳米带磁波导中偶极子交换自旋波磁波带的调制

DOI:
10.1088/1361-6463/ab84aa
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发表时间:
2020-03
期刊:
Journal of Physics D: Applied Physics
影响因子:
--
通讯作者:
Luo Jianjun
Luo Jianjun
中科院分区:
其他
文献类型:
--
作者:
Deng Jiangxia;Zhu Mengxing;Luo Jun;Zheng Hui;Zheng Peng;Feng Chunyang;Luo Jianjun

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设计了一种鱼骨状钇铁石榴石纳米条形磁振子晶体波导结构,采用面向对象的微磁框架数值计算方法,研究了结构参数对偶极交换自旋波传播特性的调制。通过改变侧分支的倾斜角度(θ)、"主骨"的宽度(W1)和两侧分支之间的分离距离(P2),可以控制磁振带图中允许带的数目、位置和宽度。除了在布里渊区(BZ)边界处出现的正常带隙之外,在色散曲线中的特定k值处出现额外的带隙,其偏离BZ边界的偏差Λ也可以由θ、W1和P2控制。与其他参数相比,倾斜角θ对自旋波传播的影响更大。
We designed a fishbone-like yttrium iron garnet nanostrip magnonic crystal waveguide structure and investigated the modulation of the structural parameters to the propagating characteristics of dipole-exchange spin waves by using the object oriented micromagnetic framework numerical calculation method. The number, position, and width of the allowed bands in the magnonic band maps can be manipulated by changing the tilted angles of the sides branch (θ), the width of the ‘main bone’ (W1), and the separatiion distance between the two side branches (P2). Besides the normal band gaps appearing at the Brillouin zone (BZ) boundaries, extra band gaps emerge at certain values of k in the dispersion curves with a deviation Λ away from the BZ boundaries which can also be controlled by θ, W1, and P2. Compared with other parameters, the tilted angle θ has a greater impact on spin wave propagation.
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