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Interfacial Dzyaloshinskii-Moriya interaction in perpendicularly magnetized Pt/Co/AlO_x ultrathin films measured by Brillouin light spectroscopy

机译:布里渊光谱法测量垂直磁化的Pt / Co / AlO_x超薄膜中的界面Dzyaloshinskii-Moriya相互作用

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摘要

Spin waves in perpendicularly magnetized Pt/Co/AlO_x/Pt ultrathin films with varying Co thicknesses (0.6-1.2 nm) have been studied with Brillouin light spectroscopy in the Damon-Eshbach geometry. The measurements reveal a pronounced nonreciprocal propagation, which increases with decreasing Co thickness. This nonreciprocity, attributed to an interfacial Dzyaloshinskii-Moriya interaction (DMI), is significantly stronger than asymmetries resulting from surface anisotropies for such modes. Results are consistent with an interfacial DMI constant D_s = -1.7 ± 0.11 pJ/m, which favors left-handed chiral spin structures. This suggests that such films below 1 nm in thickness should support chiral states such as skyrmions at room temperature.
机译:利用布里蒙光谱法研究了Damon-Eshbach几何结构中Co厚度(0.6-1.2 nm)不同的垂直磁化的Pt / Co / AlOx / Pt超薄膜中的自旋波。测量结果显示出明显的不可逆传播,该传播随Co厚度的减小而增加。归因于界面Dzyaloshinskii-Moriya交互作用(DMI)的这种不可逆性比这种模式的表面各向异性导致的不对称性要强得多。结果与界面DMI常数D_s = -1.7±0.11 pJ / m一致,这有利于左旋手性自旋结构。这表明这种厚度小于1 nm的薄膜应在室温下支持手性状态,例如天敌。

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