Abstract A phenomenon of Y3Fe5O12 (YIG)-ferromagnetic-resonance (FMR) linewidth broadening in magnetically coupled YIG-Co films is reported. The broadened linewidth cannot be attributed to previous effects which only depend on the crystalline quality of YIG. Through micromagnetic simulation, the origin of this broadened linewidth was found to be a new type of inhomogeneity effect induced by the inhomogeneous dipolar field of Co layer. Furthermore, it shows that the extent of the linewidth broadening depends on the magnetization state of Co. The broadening is remarkable when the Co domains are random. The influence of Co on YIG-FMR linewidth still exists when the spacer between YIG and Co is 315 nm, indicating it is a long-range effect due to the dipolar origin.

中文翻译：

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由可调不均匀效应引起的铁磁共振线宽展宽

摘要 报道了磁耦合 YIG-Co 薄膜中 Y3Fe5O12 (YIG)-铁磁谐振 (FMR) 线宽变宽的现象。加宽的线宽不能归因于仅取决于 YIG 结晶质量的先前效应。通过微磁模拟，发现这种加宽的线宽的起源是由 Co 层的不均匀偶极场引起的一种新型不均匀效应。此外，它表明线宽展宽的程度取决于 Co 的磁化状态。当 Co 畴是随机的时，展宽是显着的。当 YIG 和 Co 之间的间隔为 315 nm 时，Co 对 YIG-FMR 线宽的影响仍然存在，表明它是偶极起源的长程效应。