Two-dimensional materials that are intrinsically ferromagnetic are crucial for the development of compact spintronic devices. However, most non-layered 2D magnets with a strong ferromagnetic order are difficult to synthesize. Here we show that the flakes of trigonal and monoclinic Cr₅Te₈ can be grown via a chemical vapour deposition method. Using magneto-optical and magnetotransport measurements, we show that both phases exhibit robust ferromagnetism with strong perpendicular anisotropy at thicknesses of a few nanometres. A high Curie temperature of up to 200 K can be obtained by manipulating the phase structure and thickness. We also observe a colossal anomalous Hall effect in the more structurally distorted monoclinic Cr₅Te₈, with an anomalous Hall conductivity of 650 Ω⁻¹ cm⁻¹ and anomalous Hall angle of 5%.

本质上是铁磁性的二维材料对于紧凑型自旋电子器件的开发至关重要。然而，大多数具有强铁磁性的非分层二维磁体难以合成。在这里，我们展示了可以通过化学气相沉积法生长三角和单斜 Cr ₅ Te _8薄片。使用磁光和磁输运测量，我们表明两相都表现出强大的铁磁性，在几纳米的厚度下具有很强的垂直各向异性。通过控制相结构和厚度，可以获得高达 200 K 的居里温度。我们还在结构更扭曲的单斜晶 Cr ₅ Te _{8中观察到巨大的异常霍尔效应}，具有 650 Ω ^-1  cm ^-1的异常霍尔电导率和 5% 的异常霍尔角。