The effects of field history on magnetic skyrmion formation in [Pt/Co/Ir]3 multilayers
The effects of field history on magnetic skyrmion formation in [Pt/Co/Ir]3 multilayers
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DOI：
10.1016/j.jmmm.2022.169951
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发表时间：
2022-09
影响因子：
2.7
通讯作者：
Andy T. Clark;X. Wang;A. R. Stuart;Q. Wang;W. Jiang;J. Pearson;S. T. te Velthuis;A. Hoffmann;X. Cheng;K.S. Buchanan
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文献类型：
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作者：
Andy T. Clark;X. Wang;A. R. Stuart;Q. Wang;W. Jiang;J. Pearson;S. T. te Velthuis;A. Hoffmann;X. Cheng;K.S. Buchanan
本文报道了[Pt/Co/Ir]_3多层薄膜经面内磁场处理后，在室温下形成Néel型磁泡的情况。极化磁光克尔效应(p-MOKE)显微镜图像表明，在施加和随后去除面内磁场后，交流退磁后观察到的树枝状磁组态演变为磁泡天柱。利用微磁模拟系统地研究了面内磁场大小、样品的错位以及Dzyaloshinskii-Moriya相互作用(Dmi)在场处理过程中产生气泡Skyrmions过程中的作用。模拟结果表明，略低于饱和场的面内场是产生天米子的最有效的方法，而且，远离样品平面的较小的场角不仅可以改善天米子的形成，而且还提供了一种选择天米子极性的方法，其中场面外分量的方向与天米子核的方向相反。这种场处理方案为在具有DMI的多层薄膜中产生磁泡天空微子提供了一种简单而可靠的方法。
We report on the formation of Néel-type magnetic bubble skyrmions at room temperature in [Pt/Co/Ir]3multilayered thin films after an in-plane magnetic field treatment. Polar magneto-optical Kerr Effect (p-MOKE) microscopy images show that the dendritic magnetic configurations observed after AC demagnetization evolve into magnetic bubble skyrmions after the application and subsequent removal of an in-plane magnetic field. Micromagnetic simulations were used to systematically investigate the role of the in-plane magnetic field magnitude, misalignment of the sample, and the Dzyaloshinskii-Moriya interactions (DMI) in generating bubble skyrmions during the field treatment. The simulations show that in-plane fields slightly below the saturation field are the most effective at producing skyrmions, and, furthermore, a small field angle away from the sample plane not only leads to improved skyrmion formation but also provides a means to select the skyrmion polarity where the direction of the out-of-plane component of the field is opposite to the direction of the skyrmion cores. This field treatment scheme leads to a simple and reliable way to create magnetic bubble skyrmions in multilayered thin films with DMI.