Recently, two-dimensional (2D) magnetic materials have attracted broad attention due to their fascinating magnetic behavior and potential application in spintronics. However, most of exfoliated magnetic materials usually show random thickness and size, and the stability in the air is still a challenge. Hence, the controllable synthesis of 2D magnetic materials with good quality should be addressed. Here we report the controllable growth of 2D CuCr₂Se₄ crystals on mica substrates with large domain size. Most importantly, the as-grown CuCr₂Se₄ crystals demonstrate obvious ferromagnetic properties, showing a high Curie temperature of up to 436 K. Our discovery of 2D room-temperature ferromagnet CuCr₂Se₄ provides paves the way for the epitaxial growth of many more 2D magnets and provides a new platform for the spintronic applications.

最近，二维 (2D) 磁性材料因其迷人的磁性行为和在自旋电子学中的潜在应用而引起了广泛关注。然而，大多数剥离磁性材料通常表现出随机的厚度和尺寸，在空气中的稳定性仍然是一个挑战。因此，应该解决质量好的二维磁性材料的可控合成问题。在这里，我们报告了 2D CuCr ₂ Se ₄晶体在具有大畴尺寸的云母衬底上的可控生长。最重要的是，生长的 CuCr ₂ Se ₄晶体表现出明显的铁磁性，居里温度高达 436 K。我们发现了二维室温铁磁体 CuCr ₂ Se₄为更多二维磁体的外延生长铺平了道路，并为自旋电子应用提供了新平台。