Ferromagnetic-waveguide width dependence of propagation properties for magnetostatic surface spin waves
Ferromagnetic-waveguide width dependence of propagation properties for magnetostatic surface spin waves
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DOI：
10.1063/5.0046943
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发表时间：
2021-04-01
期刊：
影响因子：
1.6
通讯作者：
Manago, Takashi
中科院分区：
文献类型：
--
作者：
Kasahara, Kenji;Akamatsu, Ryusei;Manago, Takashi
通过实验和数值研究了坡莫合金 (Py) 波导中静磁表面自旋波 (MSSW) 传播特性的宽度依赖性。当Py波导的短边宽度(W-Py)和磁场(μ H-0)足够大时，自旋波(SW)强度几乎随着W-Py的减小而线性减小，并且谐振频率f(r)几乎与W-Py无关。然而，当W-Py和mu H-0都很小时，SW强度迅速降低，并且f(r)随着W-Py的减小而减小。微磁模拟表明，当W-Py和μ H-0都足够大时，Py的磁化方向几乎与磁场方向平行，SW模式变为MSSW模式。相反，当W-Py和μ H-0都很小时，由于强退磁场，磁化方向从磁场方向向Py带的长边方向倾斜，这是强度和f(r)意外降低的根源。当小型化铁磁波导用于缩小MSSW器件时，需要足够大的磁场，因为形状磁各向异性的影响不可忽视。
The width dependence of propagation properties for magnetostatic surface spin waves (MSSWs) in Permalloy (Py) waveguides was investigated experimentally and numerically. When both the short-side width of a Py waveguide (W-Py) and the magnetic field (mu H-0) were large enough, the spin wave (SW) intensity almost linearly decreased with decreasing W-Py, and the resonant frequency f(r) was almost independent of W-Py. However, when both W-Py and mu H-0 were small, the SW intensity rapidly reduced, and f(r) decreased with decreasing W-Py. Micromagnetic simulations revealed that when both W-Py and mu H-0 are large enough, the magnetization direction of Py is almost parallel to the magnetic field direction, and the SW mode becomes the MSSW mode. In contrast, when both W-Py and mu H-0 are small, magnetization direction tilts to the long-side direction of the Py strip from the magnetic field direction due to a strong demagnetizing field, which is the origin of the unexpected reduction in the intensity and f(r). When miniaturized ferromagnetic waveguides are used for shrinking MSSW devices, a sufficiently large magnetic field is necessary because the influence of the shape magnetic anisotropy cannot be ignored.