Zhang Gaojie, Guo Fei, Wu Hao, Wen Xiaokun, Yang Li, Jin Wen, Zhang Wenfeng, Chang Haixin
Center for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
Institute for Quantum Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
Nat Commun. 2022 Aug 29;13(1):5067. doi: 10.1038/s41467-022-32605-5.
The absence of two-dimensional (2D) van der Waals (vdW) ferromagnetic crystals with both above-room-temperature strong intrinsic ferromagnetism and large perpendicular magnetic anisotropy (PMA) severely hinders practical applications of 2D vdW crystals in next-generation low-power magnetoelectronic and spintronic devices. Here, we report a vdW intrinsic ferromagnetic crystal FeGaTe that exhibits record-high above-room-temperature Curie temperature (Tc, 350-380 K) for known 2D vdW intrinsic ferromagnets, high saturation magnetic moment (40.11 emu/g), large PMA energy density (4.79 × 10J/m), and large anomalous Hall angle (3%) at room temperature. Such large room-temperature PMA is better than conventional widely-used ferromagnetic films like CoFeB, and one order of magnitude larger than known 2D vdW intrinsic ferromagnets. Room-temperature thickness and angle-dependent anomalous Hall devices and direct magnetic domains imaging based on FeGaTe nanosheet have been realized. This work provides an avenue for room-temperature 2D ferromagnetism, electrical control of 2D ferromagnetism and promote the practical applications of 2D-vdW-integrated spintronic devices.
缺乏兼具高于室温的强本征铁磁性和大垂直磁各向异性（PMA）的二维（2D）范德华（vdW）铁磁晶体，严重阻碍了二维vdW晶体在下一代低功耗磁电子和自旋电子器件中的实际应用。在此，我们报道了一种vdW本征铁磁晶体FeGaTe，对于已知的二维vdW本征铁磁体，它展现出创纪录的高于室温的居里温度（Tc，约350 - 380 K）、高饱和磁矩（40.11 emu/g）、大PMA能量密度（约4.79×10 J/m）以及室温下大反常霍尔角（3%）。如此大的室温PMA优于传统广泛使用的铁磁薄膜如CoFeB，且比已知的二维vdW本征铁磁体大一个数量级。基于FeGaTe纳米片实现了室温厚度和角度依赖的反常霍尔器件以及直接磁畴成像。这项工作为室温二维铁磁性、二维铁磁性的电控制以及推动二维vdW集成自旋电子器件的实际应用提供了一条途径。
