Extraction of Dzyaloshinskii-Moriya interaction from propagating spin waves
Extraction of Dzyaloshinskii-Moriya interaction from propagating spin waves
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DOI：
10.1103/physrevb.101.064432
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发表时间：
2020-02-28
影响因子：
3.7
通讯作者：
Lavrijsen, Reinoud
中科院分区：
文献类型：
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作者：
Lucassen, Juriaan;Schippers, Casper F.;Lavrijsen, Reinoud
界面的Dzyaloshinskiii-Moriya相互作用（iZH）在薄膜磁性中具有很大的兴趣，因为它能够稳定手性自旋织构。它可以通过研究反向传播的自旋波的频率非互易性来量化。然而，由于离子是界面相互作用，当膜变得更厚时，相对效果降低，使得量化更加困难。在这里，我们利用全电传播自旋波光谱解开自旋波频率非互易性的多个贡献，以确定离子。这是通过研究在Pt/Co/Ir，Pt/Co/Pt和Ir/Co/Pt堆叠中的宽范围的磁性层厚度（从4到26 nm）的非互易性来完成的。我们发现预期的符号变化时，反转堆栈顺序和一个可以忽略的对称Pt/Co/Pt的irons。我们还提取了表面各向异性的差异，并发现了一个很大的贡献，由于形成不同的结晶相的Co，这是证实使用核磁共振和高分辨率透射电子显微镜测量。这些见解将开辟研究、量化和解开iDMI基本机制的途径，并为磁振子应用的工程大自旋波非相互作用铺平道路。
The interfacial Dzyaloshinskii-Moriya interaction (iDMI) is of great interest in thin-film magnetism because of its ability to stabilize chiral spin textures. It can be quantified by investigating the frequency nonreciprocity of oppositely propagating spin waves. However, as the iDMI is an interface interaction, the relative effect reduces when the films become thicker, making quantification more difficult. Here, we utilize all-electrical propagating spin-wave spectroscopy to disentangle multiple contributions to spin wave frequency nonreciprocity to determine the iDMI. This is done by investigating nonreciprocities across a wide range of magnetic layer thicknesses (from 4 to 26 nm) in Pt/Co/Ir, Pt/Co/Pt, and Ir/Co/Pt stacks. We find the expected sign change in the iDMI when inverting the stack order and a negligible iDMI for the symmetric Pt/Co/Pt. We additionally extract a difference in surface anisotropies and find a large contribution due to the formation of different crystalline phases of the Co, which is corroborated using nuclear magnetic resonance and high-resolution transmission-electron-microscopy measurements. These insights will open up avenues to investigate, quantify, and disentangle the fundamental mechanisms governing the iDMI, and pave a way toward engineered large spin-wave nonreciprocities for magnonic applications.