An Artificial Skyrmion Platform with Robust Tunability in Synthetic Antiferromagnetic Multilayers
An Artificial Skyrmion Platform with Robust Tunability in Synthetic Antiferromagnetic Multilayers
复制标题
合成反铁磁多层中具有鲁棒可调性的人造斯格明子平台
DOI：
10.1002/adfm.201907140
复制
发表时间：
2019-10-22
影响因子：
19
通讯作者：
Ma, Fusheng
中科院分区：
文献类型：
--
作者：
Li, Yong;Feng, Qiyuan;Ma, Fusheng
磁性Skyrmion是一种拓扑非平凡的自旋结构，它在铁磁耦合多层膜中的无序排列已被广泛报道。在这里，有序skyrmions在纳米结构的合成反铁磁（SAF）多层膜的成核方案提出和实验证明，使用直接磁化成像，间接磁强计和磁阻测量，和微磁模拟。而不是依赖于Dzyaloshinskiii-Moriya相互作用，在SAF多层膜中的反铁磁层间交换耦合履行的成核和稳定的skyrmions的作用。建议skyrmion成核方案的鲁棒性进行检查，对温度从4.5至300 K和设备尺寸从400至1200 nm。有趣的是，这些合成的skyrmions在小于100 nm的尺寸下仍然表现良好。比一般磁畴更高的稳定性可以归因于拓扑保护。因此，结果提供了一个人工skyrmion平台，以满足高密度和可设计的安排在磁振子和自旋电子学应用的功能需求。
Magnetic skyrmions are topologically nontrivial spin structures, and their existence in ferromagnetically coupled multilayers has been widely reported with a disordered arrangement. Here, a nucleation scenario of ordered skyrmions in nanostructured synthetic antiferromagnetic (SAF) multilayers is proposed and experimentally demonstrated using direct magnetization imaging, indirect magnetometer and magnetoresistance measurement, and micromagnetic simulation. Instead of relying on Dzyaloshinskii–Moriya interaction, the antiferromagnetic interlayer exchange coupling in the SAF multilayers fulfills the role of nucleation and stabilization of skyrmions. The robustness of the proposed skyrmion nucleation scenario is examined against temperature from 4.5 to 300 K and device size from 400 to 1200 nm. Interestingly, these synthetic skyrmions still behave well with a size less than 100 nm. The higher stability than generic magnetic domains can be attributed to topological protection. The results thus provide an artificial skyrmion platform to meet the functional needs of high density and designable arrangement in magnonic and spintronic applications.