Verchenko Valeriy Yu, Stepanova Anna V, Bogach Alexey V, Mironov Andrei V, Shevelkov Andrei V
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.
National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia.
Inorg Chem. 2022 Jun 20;61(24):9224-9230. doi: 10.1021/acs.inorgchem.2c00800. Epub 2022 Jun 5.
Transition metal-based layered compounds with van der Waals gaps between the structural layers are a rich source of magnetic materials for spintronic applications. Bulk crystals can be cleaved, providing high-quality two-dimensional nanomaterials, which are promising for the manipulation of spins in spintronic devices and low power quantum logic interfaces. The layered van der Waals telluride FeAsTe can be synthesized by the high-temperature reaction of elements. In the crystal structure, Fe-rich structural layers with the composition of FeAsTe are separated by the van der Waals gaps with no atoms in the interstitial region. Crystal growth employing chemical vapor transport reactions yields bulk cleavable crystals, which exhibit weak inherent ferromagnetism below the Curie temperature of = 48 K. In the ordered state, the magnetization shows a dual-slope behavior in low magnetic fields, indicating the compensated or canted nature of magnetism. Magnetic susceptibility and magnetization measurements reveal perpendicular magnetic anisotropy. The large Rhodes-Wohlfarth ratio of 4.6 indicates the itinerant nature of ferromagnetism in FeAsTe.
结构层之间存在范德华间隙的过渡金属基层状化合物是自旋电子学应用中磁性材料的丰富来源。块状晶体可以解理，从而提供高质量的二维纳米材料，这对于自旋电子器件中的自旋操控和低功率量子逻辑界面很有前景。层状范德华碲化物FeAsTe可以通过元素的高温反应合成。在晶体结构中，具有FeAsTe组成的富铁结构层被范德华间隙隔开，间隙区域没有原子。采用化学气相传输反应的晶体生长产生可解理的块状晶体，其在居里温度(T_C = 48K)以下表现出弱的固有铁磁性。在有序状态下，磁化强度在低磁场中呈现双斜率行为，表明磁性具有补偿或倾斜的性质。磁化率和磁化强度测量揭示了垂直磁各向异性。4.6的大罗德-沃尔法特比表明FeAsTe中铁磁性的巡游性质。
