采用复合磁电方法比较多晶与单晶MnSi中的斯格明子相
Comparison of skyrmion phases between poly and single-crystal MnSi by composite magnetoelectric method
AI总结：
本研究采用复合磁电法对比多晶与单晶MnSi的斯格明子相，揭示了晶粒取向、晶界缺陷对相结构、磁电响应及脱钉行为的影响，为拓扑相动力学探测提供新手段。
摘要：
我们通过测量MnSi/PMN-PT复合材料的磁电系数αE和交流磁化率，探究了多晶与单晶MnSi中的斯格明子相及相图。研究发现，由于晶粒取向随机，单晶样品中的规则斯格明子晶格相在MnSi多晶中被平均化，这导致斯格明子晶格-圆锥混合相的范围延伸至低至25 K。多晶样品中αE的异相分量幅值会随频率降低而逐渐减小，单晶样品则无此现象。随着驱动交流场的变化，两种样品中均表现出脱钉阈值行为。多晶的脱钉场强于单晶，这可能是晶界和缺陷导致低频下耗散行为减弱的原因。复合磁电方法为探测拓扑相动力学提供了一种独特途径。
英文摘要：
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.
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