论文标题
2d van der waals纳米板带具有强大的铁磁性
2D van der Waals Nanoplatelets with Robust Ferromagnetism
论文作者
论文摘要
我们已经合成了铁磁二维（2D）范德华材料CRI3的独特胶体纳米平板，并通过磁性，磁性和磁性圆形二分法镜头表征了这些纳米片。隔离的CRI3纳米板的侧面尺寸约为25 nm，整体厚度仅为〜4 nm，仅对应于几个CRI3单层。磁性和磁光测量结果表明，尽管存在很强的空间限制，但这些纳米片中的稳健的2D铁磁有序与库里温度类似于散装CRI3中的温度。这些数据还显示了类似于在微米大小的几层2D纸中观察到的磁化步骤，并且与几层范德华堆栈中单个CRI3层的协同自旋反转相关。也获得了CRBR3和与阴离子合成的CR（I1-XBRX）3纳米平板电脑的类似数据。这些结果代表了任何组合物的横向限制2D范德华铁磁体的第一个例子。纳米横向尺寸在纳米横向尺寸上强大的铁磁学的演示为基于范德华的铁磁体的旋转设备的小型化开辟了新的门。
We have synthesized unique colloidal nanoplatelets of the ferromagnetic two-dimensional (2D) van der Waals material CrI3 and have characterized these nanoplatelets structurally, magnetically, and by magnetic circular dichroism spectroscopy. The isolated CrI3 nanoplatelets have lateral dimensions of ~25 nm and ensemble thicknesses of only ~4 nm, corresponding to just a few CrI3 monolayers. Magnetic and magneto-optical measurements demonstrate robust 2D ferromagnetic ordering in these nanoplatelets with Curie temperatures similar to those observed in bulk CrI3, despite the strong spatial confinement. These data also show magnetization steps akin to those observed in micron-sized few-layer 2D sheets and associated with concerted spin-reversal of individual CrI3 layers within few-layer van der Waals stacks. Similar data have also been obtained for CrBr3 and anion-alloyed Cr(I1-xBrx)3 nanoplatelets. These results represent the first example of laterally confined 2D van der Waals ferromagnets of any composition. The demonstration of robust ferromagnetism at nanometer lateral dimensions opens new doors for miniaturization in spintronics devices based on van der Waals ferromagnets.
