Toward intrinsic room-temperature ferromagnetism in two-dimensional semiconductors

摘要

Two-dimensional (2D) ferromagnetic semiconductors have been recognized as the most promising candidates for next-generation low-cost, high-performance and nano-scale spintronic applications such as spin field-effect transistors and quantum computation/communication. However, as one of the 125 important scientific issues raised by Science journal in 2005 that "is it possible to create magnetic semiconductors that work at room temperature?", how to achieve a feasible ferromagnetic semiconductor with high Curie temperature is still a long-standing challenge despite of tremendous efforts have been devoted in this field since 1960s. The recent discovery of 2D ferromagnetic semiconductors Cr_2Ge_2Te_6 and CrI_3 has evoked new research interests in 2D intrinsic ferromagnetic semiconductors. But the low Curie temperature (< 45 K) of these materials is still badly hindering their industrial applications.