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arXiv 2202.02091cond-mat.mtrl-scicond-mat.mes-hallcond-mat.str-el
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Skyrmionic织构的矢量涡度:一种可由磁场调节的内自由度

Vector vorticity of skyrmionic texture: an internal degree of freedom tunable by magnetic field

Xiaoyan Yao, Shuai Dong

摘要:

与非中心对称材料中由Dzyaloshinskiii-Moriya相互作用驱动的skyrmion不同,中心对称磁体中的skyrmion织构可能具有额外的内部自由度,这极大地丰富了其形貌,暗示了拓扑保护所允许的连续变形,并实现了灵活的可调性和潜在的功能性。为了更好地描述涡的内部自由度,将传统的整数标量涡推广为允许连续旋转的矢量涡。进一步简化的涡度角和螺旋度角代表了自旋空间的全部旋转自由度。具有阻挫的中心对称磁体为实现对这些内部自由度的可控操纵提供了一个完美的平台,其中磁场可以被施加以在晶体和孤立形式的skyrmionic织构中连续地调谐涡度,并且螺旋度可以进一步由电场控制。此外,模拟还揭示了与涡度调制相关的独特动力学效应,即旋转磁场可以产生直线运动来调节涡度,而控制涡度也可以调制由自旋极化电流引起的动力学。

英文摘要:

Different from the skyrmion driven by the Dzyaloshinskii-Moriya interaction in non-centrosymmetric materials, the skyrmionic texture in centrosymmetric magnet may possess the extra internal degrees of freedom, which greatly enrich its morphologies, imply the continuous deformation allowed by topological protection, and enable flexible tunability and potential functionality. To describe the internal degree of freedom to full extent, the conventional integer-valued scalar vorticity is extended into a vector vorticity with continuous rotation allowed. The further simplified vorticity angle, together with helicity angle, represents the whole rotation freedom of spin space. The centrosymmetric magnet with frustration provides a perfect platform for realizing a controllable manipulation on these internal degrees of freedom, where the magnetic field can be applied to tune vorticity continuously in both crystal and isolated forms of skyrmionic texture, and the helicity can be further controlled by electric field. Moreover, the simulation reveals the distinctive dynamic effects related to the vorticity modulation, namely, a straight motion can be generated by rotating magnetic field to tune vorticity, and the vorticity can also be controlled to modulate the dynamics induced by the spin polarized current.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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