Low-temperature monoclinic layer stacking in atomically thin CrI3 crystals
Low-temperature monoclinic layer stacking in atomically thin CrI3 crystals
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原子薄 CrI3 晶体中的低温单斜层堆叠
DOI：
10.1088/2053-1583/ab4c64
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发表时间：
2019-08
期刊：
影响因子：
5.5
通讯作者：
Gibertini Marco
中科院分区：
文献类型：
--
作者：
Ubrig Nicolas;Wang Zhe;Teyssier Jeremie;Taniguchi Takashi;Watanabe Kenji;Giannini Enrico;Morpurgo Alberto F.;Gibertini Marco
三碘化铬，CrI3，是一种有前途的磁性二维半导体，其中自旋在单层内铁磁排列。在自旋电子学中的潜在应用来自于相邻层之间的反铁磁有序，其引起自旋过滤和隧穿器件中的大磁阻。这个关键特征只出现在薄的多层膜中，它不是从大块晶体中继承的，相反，相邻的层共享相同的铁磁自旋取向。这种散装和薄样品之间的差异是出乎意料的，因为层之间的磁有序产生的交换相互作用是本地的性质，不应该强烈依赖于厚度。在这里，我们解决了这一争议，并通过偏振分辨拉曼光谱表明，薄多层膜不经历典型的大块晶体的结构相变。因此，不同的堆叠模式是存在于薄和散装样品在磁性设置的温度下，根据先前的第一性原理模拟，这导致在不同的层间磁排序。我们的实验结果提供了证据的堆叠顺序和CrI3的磁性之间的强相互作用，打开有趣的角度来设计的磁态的货车德瓦尔斯多层膜。
Chromium triiodide, CrI3, is emerging as a promising magnetic two-dimensional semiconductor where spins are ferromagnetically aligned within a single layer. Potential applications in spintronics arise from an antiferromagnetic ordering between adjacent layers that gives rise to spin filtering and a large magnetoresistance in tunnelling devices. This key feature appears only in thin multilayers and it is not inherited from bulk crystals, where instead neighbouring layers share the same ferromagnetic spin orientation. This discrepancy between bulk and thin samples is unexpected, as magnetic ordering between layers arises from exchange interactions that are local in nature and should not depend strongly on thickness. Here we solve this controversy and show through polarization resolved Raman spectroscopy that thin multilayers do not undergo a structural phase transition typical of bulk crystals. As a consequence, a different stacking pattern is present in thin and bulk samples at the temperatures at which magnetism sets in and, according to previous first-principles simulations, this results in a different interlayer magnetic ordering. Our experimental findings provide evidence for the strong interplay between stacking order and magnetism in CrI3, opening interesting perspectives to design the magnetic state of van der Waals multilayers.
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