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Structure and Magnetism of EuS on Bi2Se3(0001)
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2020-07-22 , DOI: 10.1002/pssb.202000290 Holger L. Meyerheim 1 , Arthur Ernst 1, 2 , Katayoon Mohseni 1 , Andrey Polyakov 1 , Igor V. Maznichenko 3, 4 , Pawel A. Buczek 4 , Alessandro Coati 5 , Stuart S. P. Parkin 1
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2020-07-22 , DOI: 10.1002/pssb.202000290 Holger L. Meyerheim 1 , Arthur Ernst 1, 2 , Katayoon Mohseni 1 , Andrey Polyakov 1 , Igor V. Maznichenko 3, 4 , Pawel A. Buczek 4 , Alessandro Coati 5 , Stuart S. P. Parkin 1
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The rocksalt‐type ferromagnetic (FM) insulator EuS (bulk TC = 17 K) grown on Bi2Se3 with well‐matched (111) plane of the film and (0001) plane of the substrate is studied. The system may feature magnetic proximity effect breaking the time‐reversal symmetry and opening a bandgap in the metallic topologically protected surface state of Bi2Se3. The experimental X‐ray diffraction studies are combined with ab initio calculations to resolve contradictory results concerning the enhancement of the TC up to 300 K and the degree of induced magnetization in the system. It is concluded that previous studies relied on idealized and unconfirmed structure models. Herein, it is shown by surface X‐ray diffraction (SXRD) with ab initio calculations that a two double layer‐thick EuS film grows with a sharp interface and without chemical intermixing in a single domain state in an FCC‐type stacking on the Bi2Se3(0001) surface in which the topmost layer is metallic, thereby lifting polarity. A large pz‐orbital‐derived top‐layer sulfur magnetic moment of 0.6 μB is found, whereas for europium, μEu = 6.9 μB throughout the film is found. No magnetization within the first Bi2Se3 quintuple layer is found. The calculation of the exchange parameters Jij indicates a complex FM and antiferromagnetic ordering between europium and sulfur with a maximum Néel temperature of 226 K.
中文翻译：
Bi2Se3（0001）上EuS的结构和磁性
研究了 在Bi 2 Se 3上生长的岩石盐型铁磁（FM）绝缘体EuS（体T C = 17 K），其薄膜的（111）平面与基底的（0001）平面完全匹配。该系统可能具有磁性接近效应，打破了时间反转对称性，并在Bi 2 Se 3的金属拓扑受保护的表面状态下打开了带隙。实验X射线衍射研究与从头算相结合以解决与T C增强有关的矛盾结果高达300 K以及系统中的感应磁化强度。结论是，先前的研究依赖于理想化和未经确认的结构模型。在此，通过表面X射线衍射（SXRD）和从头算的计算表明，两层双层厚的EuS薄膜生长时具有清晰的界面，并且在Bi上以FCC型堆叠的单畴状态没有化学混合2 Se 3（0001）表面的最上层是金属，从而提升了极性。一个大的p ž 0.6μ的-orbital衍生顶层硫磁矩乙被发现，而对于铕，μ的Eu = 6.9μ乙整个电影被发现。在第一Bi 2 Se 3五元组层内未发现磁化。交换参数J ij的计算表明euro和硫之间的FM和反铁磁有序排列，最高Néel温度为226K。
更新日期：2020-07-22
中文翻译：
Bi2Se3（0001）上EuS的结构和磁性
研究了 在Bi 2 Se 3上生长的岩石盐型铁磁（FM）绝缘体EuS（体T C = 17 K），其薄膜的（111）平面与基底的（0001）平面完全匹配。该系统可能具有磁性接近效应，打破了时间反转对称性，并在Bi 2 Se 3的金属拓扑受保护的表面状态下打开了带隙。实验X射线衍射研究与从头算相结合以解决与T C增强有关的矛盾结果高达300 K以及系统中的感应磁化强度。结论是，先前的研究依赖于理想化和未经确认的结构模型。在此，通过表面X射线衍射（SXRD）和从头算的计算表明，两层双层厚的EuS薄膜生长时具有清晰的界面，并且在Bi上以FCC型堆叠的单畴状态没有化学混合2 Se 3（0001）表面的最上层是金属，从而提升了极性。一个大的p ž 0.6μ的-orbital衍生顶层硫磁矩乙被发现，而对于铕，μ的Eu = 6.9μ乙整个电影被发现。在第一Bi 2 Se 3五元组层内未发现磁化。交换参数J ij的计算表明euro和硫之间的FM和反铁磁有序排列，最高Néel温度为226K。
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