Topological spin memory of antiferromagnetically coupled skyrmion pairs in Co/Gd/Pt multilayers
Topological spin memory of antiferromagnetically coupled skyrmion pairs in Co/Gd/Pt multilayers
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DOI：
10.1103/physrevmaterials.6.084412
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发表时间：
2022-08
影响因子：
3.4
通讯作者：
Xiao Wang;A. R. Stuart;Mitchell S. Swyt;C. Q. Flores;Andy T. Clark;Adzo Fiagbenu;R. Chopdekar;P. Lapa;Zhuyun Xiao;Dava Keavney;R. Rosenberg;M. Vogel;J. Pearson;S. Velthuis;A. Hoffmann;K. Buchanan;Xuemei M. Cheng
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文献类型：
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作者：
Xiao Wang;A. R. Stuart;Mitchell S. Swyt;C. Q. Flores;Andy T. Clark;Adzo Fiagbenu;R. Chopdekar;P. Lapa;Zhuyun Xiao;Dava Keavney;R. Rosenberg;M. Vogel;J. Pearson;S. Velthuis;A. Hoffmann;K. Buchanan;Xuemei M. Cheng
反铁磁（AFM）耦合斯格明子为自旋电子器件提供了潜在的优势，包括减少偶极场，可以实现更小的斯格明子尺寸和减少斯格明子霍尔效应。然而，AFM 耦合斯格明子在低温循环过程中遭受剧烈自旋变形的拓扑稳定性尚未得到研究。在这里，我们报告了 [Co / Gd / Pt] 10 多层薄膜中 AFM 耦合斯格明子对的拓扑自旋记忆效应的发现。光电电子显微镜成像显示，在室温下稳定的多层中的气泡斯格明子随着温度降低而演变成复杂的面内自旋纹理，并在样品回暖时完全重新形成。模拟表明，Dzyaloshinskii-Moriya 相互作用在这种自旋记忆效应中发挥着关键作用，并进一步揭示了拓扑电荷在整个自旋纹理重排和恢复过程中得以保留。这些结果突出了拓扑保护的一个关键方面——在连续变形下保存拓扑特性——并且也为信息加密和恢复提供了一条有前途的途径。
Antiferromagnetically (AFM) coupled skyrmions offer potential advantages for spintronic devices, including reduced dipolar fields that may enable smaller skyrmion sizes and a reduction of the skyrmion Hall effect. However, the topological stability of AFM-coupled skyrmions subjected to dramatic spin deformation through low-temperature cycling has not been investigated. Here we report the discovery of a topological spin memory effect for AFM-coupled skyrmion pairs in [Co / Gd / Pt] 10 multilayered films. Photoemission electron microscopy imaging shows that bubble skyrmions in the multilayer that are stable at room temperature evolve into complex in-plane spin textures as the temperature is lowered and reform completely when the sample is warmed back up. Simulations demonstrate that Dzyaloshinskii-Moriya interactions play a key role in this spin memory effect, and furthermore reveal that the topological charge is preserved throughout the dramatic spin texture rearrangement and recovery. These results highlight a key aspect of topological protection—the preservation of the topological properties under continuous deformation—and also provide a promising avenue for information encryption and recovery.