Asymmetric spin-wave dispersion due to Dzyaloshinskii-Moriya interaction in an ultrathin Pt/CoFeB film
Asymmetric spin-wave dispersion due to Dzyaloshinskii-Moriya interaction in an ultrathin Pt/CoFeB film
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DOI：
10.1063/1.4907173
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发表时间：
2015-02-02
影响因子：
4
通讯作者：
Yang, Hyunsoo
中科院分区：
文献类型：
--
作者：
Di, Kai;Zhang, Vanessa Li;Yang, Hyunsoo
采用布里渊光谱，强烈的界面Dzyaloshinskiii-Moriya相互作用已被观察到在Pt/CoFeB薄膜。我们的微磁学模拟表明，自旋波非互易性由于不对称的表面钉扎是微不足道的0.8 nm厚的CoFeB膜研究。所观察到的高不对称性的单调自旋波色散关系，因此归因于强Dzyaloshinskiii-Moriya相互作用存在于Pt/CoFeB界面。我们的研究结果将进一步提高CoFeB作为磁子和自旋电子学应用的重要材料的意义。(C)2015 AIP Publishing LLC.
Employing Brillouin spectroscopy, strong interfacial Dzyaloshinskii-Moriya interactions have been observed in an ultrathin Pt/CoFeB film. Our micromagnetic simulations show that spin-wave nonreciprocity due to asymmetric surface pinning is insignificant for the 0.8 nm-thick CoFeB film studied. The observed high asymmetry of the monotonic spin wave dispersion relation is thus ascribed to strong Dzyaloshinskii-Moriya interactions present at the Pt/CoFeB interface. Our findings should further enhance the significance of CoFeB as an important material for magnonic and spintronic applications. (C) 2015 AIP Publishing LLC.