Kerr effect anomaly in magnetic topological insulator superlattices
Kerr effect anomaly in magnetic topological insulator superlattices
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DOI：
10.1088/1361-6528/aba210
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发表时间：
2020-08
期刊：
影响因子：
3.5
通讯作者：
Jieyi Liu;Angadjit Singh;B. Kuerbanjiang;C. Barnes;T. Hesjedal
中科院分区：
文献类型：
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作者：
Jieyi Liu;Angadjit Singh;B. Kuerbanjiang;C. Barnes;T. Hesjedal
本文报道了交替掺杂过渡金属和稀土的磁性拓扑绝缘体超晶格薄膜的磁光克尔效应（MOKE）研究。我们观察到在低温下磁化反转时，在MOKE磁滞环中出现了一个意想不到的驼峰，这让人想起了在输运测量中报道的拓扑霍尔效应（the）。The通常与磁天幕的存在有关，即源于实际空间拓扑缺陷的手性自旋织构。在这里，观察到的效应与超晶格中稀土掺杂层的铁磁有序有关。我们的研究可能为磁性薄膜中skyrmions的非侵入性光学研究提供了一种新的方法，补充了电输运测量，其中拓扑霍尔信号通常是非平凡磁化模式的唯一提示。
We report the magneto-optical Kerr effect (MOKE) study of magnetic topological insulator superlattice films with alternating transition-metal and rare-earth doping. We observe an unexpected hump in the MOKE hysteresis loops upon magnetization reversal at low temperatures, reminiscent of the topological Hall effect (THE) reported in transport measurements. The THE is commonly associated with the existence of magnetic skyrmions, i.e. chiral spin textures originating from topological defects in real space. Here, the observation of the effect is tied to ferromagnetic ordering in the rare-earth-doped layers of the superlattice. Our study may provide a new approach for the non-invasive optical investigation of skyrmions in magnetic films, complementary to electrical transport measurements, where the topological Hall signal is often the only hint of non-trivial magnetization patterns.