论文标题
通过复合磁电选择方法比较聚和单晶MNSI之间的天际阶段
Comparison of skyrmion phases between poly and single-crystal MnSi by composite magnetoelectric method
论文作者
论文摘要
我们通过测量MNSI/PMN-PT复合材料的磁电系数Alfae和AC磁敏感性，探索了聚和单晶MNSI的Skyrmion相和相图。我们发现，由于随机的晶粒取向，在MNSI多晶中平均定期的Skyrmion晶格阶段导致延长的Skymion Lattice-conical混合物相位至25K。多晶晶体的Alfae中静置分量的幅度逐渐降低，逐渐降低，逐渐降低了频率的频率。随着驱动AC场的变化，它揭示了两个样本中含量的阈值行为。在多晶中，默认场比单晶中的含量更强，并且可能导致由于晶界和缺陷而导致较低频率下耗散行为的减少。复合磁电选择方法为探针拓扑相动态提供了独特的方法。
We have explored the skyrmion phases and phase diagram of poly and single-crystal MnSi by the measurements of the magnetoelectric coefficient alfaE and ac magnetic susceptibility of the MnSi/PMN-PT composite. We found that the regular skyrmion lattice phase in single crystal sample has been averaged in the MnSi polycrystal due to random grain orientations which results in an extended skyrmion lattice-conical mixture phase down to 25 K. The magnitude of the out-of-phase component in alfaE of the polycrystal, not single crystal, decreases gradually with decreasing frequency. With the changing of the driven ac field, it reveals a depinning threshold behavior in both samples. The depinning field is stronger in the polycrystal than that in single crystal and maybe responsible for the diminishing of dissipative behavior at lower frequency due to grain boundaries and defects. The composite magnetoelectric method provides a unique approach to probe topological phase dynamics.
