The study of exfoliated 2D magnetic materials is a vibrant and rapidly progressing field and is impacting many areas of condensed matter research including fundamental magnetism, spintronics and optoelectronics, and topological spin and electronic systems. The availability of promising candidate materials has enabled much of the progress in this field. Here, I present my perspective on the development of cleavable magnetic materials with a focus on transition metal halides and chalcogenides and an emphasis on crystal structure and magnetic order. To give proper context for these discussions, brief and incomplete surveys of recent work are included, focusing on specific aspects that I find most useful for guiding work on emerging materials and motivating expansion into other compounds and material families. Several instances of structural changes that can differentiate behaviors of bulk and ultrathin specimens are noted. Probing and understanding potential structural differences present a challenge but also an opportunity for material and device development, if they can be predicted and controlled. It is clear that careful investigations of structure, layer stacking, and defects in materials, how they may relate to the crystal chemistry, and how they may be different in crystals and mono- or few-layer specimens provide invaluable context for understanding the behavior of van der Waals layered magnetic materials.

中文翻译：

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范德华层状过渡金属卤化物和硫属化物的可切割磁性材料

剥离二维磁性材料的研究是一个充满活力且发展迅速的领域，正在影响凝聚态研究的许多领域，包括基础磁性、自旋电子学和光电子学，以及拓扑自旋和电子系统。有前景的候选材料的可用性促成了该领域的大部分进展。在这里，我提出了我对可切割磁性材料发展的看法，重点是过渡金属卤化物和硫属化物，并强调晶体结构和磁序。为了为这些讨论提供适当的背景，包括对最近工作的简短和不完整的调查，重点关注我认为对指导新兴材料的工作和推动扩展到其他化合物和材料家族最有用的特定方面。注意到可以区分大块和超薄样品行为的几个结构变化实例。如果可以预测和控制潜在的结构差异，探索和理解潜在的结构差异是一个挑战，但也是材料和设备开发的机会。很明显，仔细研究材料中的结构、层堆叠和缺陷，它们与晶体化学的关系，以及它们在晶体和单层或少层样品中的不同之处，为理解材料的行为提供了宝贵的背景信息。范德瓦尔斯层状磁性材料。如果它们可以被预测和控制。很明显，仔细研究材料中的结构、层堆叠和缺陷，它们与晶体化学的关系，以及它们在晶体和单层或少层样品中的不同之处，为理解材料的行为提供了宝贵的背景信息。范德瓦尔斯层状磁性材料。如果它们可以被预测和控制。很明显，仔细研究材料中的结构、层堆叠和缺陷，它们与晶体化学的关系，以及它们在晶体和单层或少层样品中的不同之处，为理解材料的行为提供了宝贵的背景信息。范德瓦尔斯层状磁性材料。