范德瓦尔斯磁性材料CrOCl变磁性相变的磁力显微镜研究

近年来,二维范德瓦尔斯磁性材料因为在自旋电子学的应用前景而吸引了广泛的关注.CrOCl是一种范德瓦尔斯磁性材料，理论预言其单层具有高达160 K的居里温度，因此吸引了广泛的关注。为了更好的理解这一材料的磁性，我们利用磁力显微镜研究了CrOCl变磁性相变中磁畴结构随磁场的变化。实验发现，在2K下CrOCl样品表面出现随磁场变化的方格条纹，给出了变磁性相比中反铁磁相和铁磁相竞争的图样，并通过二维快速傅里叶变换证实了CrOCl磁性的各向异性。我们的结果为后续研究CrOCl薄层的磁性提供了参考依据。

Phase Transition study of van der Waals Magnetic Material CrOCl Using Magnetic Force Microscopy

In recent years, two-dimensional van der Waals magnetic materials have attracted attention widely because of their application prospects in spintronics. Although the van der Waals magnetic material CrI3 and Cr3GeTe2 have been verified long-term magnetic order under few layer at low temperature, it is necessary to find a 2D magnet at high temperature so that it would be possible for practical application. CrOCl is a van der Waals magnetic material, which is predicted to have a Curie temperature up to 160K under a single layer. We study the change of the magnetic domain structure in the metamagnetic phase transition of the CrOCl sample using magnetic force microscopy. We notice that the grid fringes appear on the surface of the CrOCl sample while the magnetic field changing, and analysis the pattern of the competition by 2D-FFT between the antiferromagnetic phase and the ferromagnetic phase. This work provides a reference for the future study of CrOCl magnetic behavior under few-layer.