Intrinsic 2D Ferromagnetism in V5Se8 Epitaxial Thin Films
Intrinsic 2D Ferromagnetism in V5Se8 Epitaxial Thin Films
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DOI：
10.1021/acs.nanolett.9b03614
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发表时间：
2019-12-01
期刊：
影响因子：
10.8
通讯作者：
Iwasa, Yoshihiro
中科院分区：
文献类型：
--
作者：
Nakano, Masaki;Wang, Yue;Iwasa, Yoshihiro
原子级薄货车德瓦尔斯晶体内禀铁磁性的发现为二维极限磁性的基础研究和磁性货车德瓦尔斯异质结构的发展开辟了一个新的研究领域。目前，各种二维铁磁性主要是通过机械剥离“原始铁磁性（FM）”的货车范德华晶体，而自底向上的薄膜生长技术的方法已经证明了涌现的二维铁磁性在各种“原始非FM”的货车范德华材料。在这里，我们表明，V5Se8外延薄膜生长的分子束外延表现出新兴的2D铁磁性与固有的自旋极化的V 3D电子，尽管散装对应物是“原来的反铁磁性”。此外，厚度依赖性测量表明，这种新开发的2D铁磁体可以被归类为具有弱磁各向异性的巡回2D海森堡铁磁体，从而将2D磁体的阵容扩大到那些可能有利于未来自旋电子学应用的磁体。
The discoveries of intrinsic ferromagnetism in atomically thin van der Waals crystals have opened a new research field enabling fundamental studies on magnetism at two-dimensional (2D) limit as well as development of magnetic van der Waals heterostructures. Currently, a variety of 2D ferromagnetism has been explored mainly by mechanically exfoliating "originally ferromagnetic (FM)" van der Waals crystals, while a bottom-up approach by thin-film growth technique has demonstrated emergent 2D ferromagnetism in a variety of "originally non-FM" van der Waals materials. Here we demonstrate that V5Se8 epitaxial thin films grown by molecular-beam epitaxy exhibit emergent 2D ferromagnetism with intrinsic spin polarization of the V 3d electrons despite that the bulk counterpart is "originally antiferromagnetic". Moreover, thickness-dependence measurements reveal that this newly developed 2D ferromagnet could be classified as an itinerant 2D Heisenberg ferromagnet with weak magnetic anisotropy, broadening a lineup of 2D magnets to those potentially beneficial for future spintronics applications.