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FeCl2/MoS2/FeCl2 van der Waals junction for spintronic applications
Journal of Materials Chemistry C ( IF 6.4 ) Pub Date : 2020-10-08 , DOI: 10.1039/d0tc04156d
Yulin Feng 1, 2, 3, 4 , Xuming Wu 1, 2, 3, 4 , Lei Hu 1, 2, 3, 4 , Guoying Gao 1, 2, 3, 4, 5
Affiliation  

Atomically thin 2D magnetic materials have attracted increasing attention due to their promising applications in spintronic devices. Although more and more 2D intrinsic ferromagnetic materials have been theoretically predicted, few of them have been experimentally synthesized due to the thermal fluctuations at finite temperatures, and unfortunately, they have either low Curie temperatures or low spin polarization, which is not beneficial to spintronic applications. Very recently, the predicted 2D ferromagnetic half-metal of 1T-FeCl2 with 100% spin polarization, high Curie temperature and large magnetic anisotropic energy has been grown by molecular-beam epitaxy. In this work, we propose a vertical 1T-FeCl2-based van der Waals junction of 1T-FeCl2/2H-MoS2/1T-FeCl2 with the electrode of 1T-MoS2, which has the advantage of clean interfaces compared to the lateral 2D heterostructures. Our calculated spin transport properties based on the first-principles and the nonequilibrium Green's function method indicate the excellent spin filtering effect and negative differential resistance effect as well as the high tunnel magnetoresistance ratio (up to 6300%). The physical mechanisms are discussed in terms of the spin-resolved junction density of states and the energy- and momentum-resolved spin-polarized transmission spectra. The standing wave pattern and the quantum-well resonances are observed in the junction. These results suggest the potential 2D spintronic applications for the experimentally synthesized atomically thin 1T-FeCl2, and will stimulate experimental and theoretical studies on van der Waals magnetic tunnel junctions.

中文翻译:

用于自旋电子学的FeCl2 / MoS2 / FeCl2范德华结

原子薄的2D磁性材料因其在自旋电子设备中的应用前景而备受关注。尽管从理论上预测了越来越多的2D本征铁磁材料,但是由于有限温度下的热波动,很少能通过实验合成它们,而且不幸的是,它们的居里温度低或自旋极化率低,这不利于自旋电子学应用。最近,通过分子束外延生长了具有100%自旋极化,居里温度高和大的各向异性磁能的1T-FeCl 2的二维2D铁磁半金属。在这项工作中,我们提出了1T-FeCl 2 / 2H-MoS的基于1T-FeCl 2的垂直范德华结2 / 1T-FeCl 2和1T-MoS 2电极与横向2D异质结构相比,它具有干净的界面的优势。我们基于第一性原理和非平衡格林函数方法计算出的自旋输运性质表明,其出色的自旋过滤效果和负微分电阻效应以及高隧道磁阻比(高达6300%)。根据状态的自旋分辨结密度以及能量和动量分辨的自旋极化透射光谱讨论了物理机理。在结中观察到驻波图和量子阱共振。这些结果表明,实验合成的原子薄1T-FeCl 2的潜在2D自旋电子学应用,并将刺激范德华磁隧道结的实验和理论研究。
更新日期:2020-10-19
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