Enhanced optical mode coherence in exchange coupled soft magnetic multilayers
Enhanced optical mode coherence in exchange coupled soft magnetic multilayers
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DOI：
10.1063/5.0093827
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发表时间：
2022-06
影响因子：
3.2
通讯作者：
H. Liu;Agne Ciuciulkaite;V. Kapaklis;D. Karaiskaj;D. Arena
中科院分区：
文献类型：
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作者：
H. Liu;Agne Ciuciulkaite;V. Kapaklis;D. Karaiskaj;D. Arena
我们报道了一系列磁性三层结构中耦合自旋激发模的全光学研究。使用时间分辨磁光克尔效应（tr-MOKE）磁力测量法，我们在[公式：见文本]/Ru/[公式：见文本]多层膜中观察到多模相干自旋激发，尽管tr-MOKE光学检测仅对[公式：见文本]磁化动力学敏感。不同模式的频移表明，当Ru间隔层厚度从8 μ m增加到200 μ m时，[公式：见正文]和[公式：见正文]层之间的耦合从反铁磁到铁磁再到非耦合变化。即使在未耦合的[公式：见正文]和[公式：见正文]层的情况下，[公式：见正文]层中的高频相干振荡的寿命也增加了200%-300%以上。结果表明，一个额外的方法来减少高力矩合金在层状磁性纳米结构的阻尼。
We report on an all-optical investigation of coupled spin excitation modes in a series of magnetic trilayer structures. Using time-resolved magneto-optic Kerr effect (tr-MOKE) magnetometry, we observe multi-mode coherent spin excitations in [Formula: see text]/Ru/[Formula: see text] multilayers even though the tr-MOKE optical detection is sensitive only to the [Formula: see text] magnetization dynamics. Frequency shifts of the different modes indicate that the coupling between the [Formula: see text] and [Formula: see text] layers varies from anti-ferromagnetic to ferromagnetic to uncoupled as the Ru spacer layer thickness is increased from 8 Å to 200 Å. The lifetime of the high frequency coherent oscillations in the [Formula: see text] layer increases by over 200%–300% even in the case of uncoupled [Formula: see text] and [Formula: see text] layers with a 200 Å thick Ru spacer. The results suggest an additional method to decrease the damping of high-moment alloys in layered magnetic nanostructures.