论文标题
Cu2oseo3中低温天空状态的微波光谱法
Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3
论文作者
论文摘要
在立方手性磁铁Cu2oseo3中，低温的天空状态（LTS），并且在与<100>平行的磁场中观察到同时倾斜的锥形态。在这项工作中，我们报告了这些新型磁性状态的动态共振。在通过场循环促进LT的成核之后，我们将宽带微波光谱应用于两个实验几何形状，主要提供平面内或平面外激发。通过将结果与线性自旋波理论进行比较，我们清楚地识别了与倾斜状态，与LTS相关的旋转和呼吸模式相关的谐音模式，以及与磁晶的磁极晶体介导的呼吸模式与呼吸模式的杂交。最有趣的是，我们的发现表明，在减小的磁场下，六边形的天际晶格在斜变形的情况下变得不稳定，反映在伸长的天空中的形成中。
In the cubic chiral magnet Cu2OSeO3 a low-temperature skyrmion state (LTS) and a concomitant tilted conical state are observed for magnetic fields parallel to <100>. In this work, we report on the dynamic resonances of these novel magnetic states. After promoting the nucleation of the LTS by means of field cycling, we apply broadband microwave spectroscopy in two experimental geometries that provide either predominantly in-plane or out-of-plane excitation. By comparing the results to linear spin-wave theory, we clearly identify resonant modes associated with the tilted conical state, the gyrational and breathing modes associated with the LTS, as well as the hybridization of the breathing mode with a dark octupole gyration mode mediated by the magnetocrystalline anisotropies. Most intriguingly, our findings suggest that under decreasing fields the hexagonal skyrmion lattice becomes unstable with respect to an oblique deformation, reflected in the formation of elongated skyrmions.
