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The explosive growth of quantum computing, high-frequency devices, high-density information storage and other applications will stimulate more advanced information technology needs in high integration, ultra-high response, low power consumption and other aspects. In the face of the continuous miniaturization of transistors and memory cells, the interaction between electron charge and spin is very promising. Therefore, the study of two-dimensional Ferromagnetic Semiconductors and their heterojunctions will be an important direction, which is expected to combine the complementary functions of semiconductors and ferromagnetic materials to allow the coupling and independent control of electronic charge and spin. Professor Wang Jinlan's team of Southeast University published a review paper on infomat entitled "magic two dimensional layered crystals meet with ferrometallic semiconductors". In this paper, the progress of theoretical research on two-dimensional intrinsic Ferromagnetic Semiconductors in recent years is summarized, and the current strategies to enhance ferromagnetism are discussed, including the mechanism of magnetic exchange interaction and the significance of magnetic anisotropy. At the same time, the multi-functional spin related properties of ultrathin ferromagnetic semiconductor and its van der Waals heterojunction, such as magnetoelectricity, valley electron and quantum anomalous Hall effect, are also introduced, and the current challenges and development prospects in this field are prospected.
In the past few years, two-dimensional ferromagnetic semiconductors have been widely concerned and made great progress. Various intrinsic two-dimensional ferromagnetic semiconductors with different crystal structures and unique properties have been widely studied. Firstly, the kinds and magnetic properties of two-dimensional intrinsic Ferromagnetic Semiconductors are introduced. Firstly, the structural and physical characteristics of two-dimensional ferromagnetic semiconductors are summarized. Because the Curie temperature of most single-layer or multi-layer Ferromagnetic Semiconductors is far lower than room temperature, ferromagnetic exchange interaction and magnetic anisotropy are two key factors of low-dimensional magnetism. The former is directly related to Curie temperature, and the latter plays an important role in preventing spin thermal disturbance. Therefore, the strategies of strain, carrier doping, adsorption, vacancy and alloy construction are introduced to enhance ferromagnetism. Secondly, this paper discusses the multi-functional properties based on the unique magnetic and electronic properties of two-dimensional Ferromagnetic Semiconductors and their heterojunctions, including magnetoelectric coupling, spin Valley coupling and quantum anomalous Hall effect, which is necessary for the application of Ferromagnetic Semiconductors in spin electronics in the future.
Although great progress has been made in the study of two-dimensional layered Ferromagnetic Semiconductors, it is still in its infancy. At last, more attention should be paid to the search methods of new layered Ferromagnetic Semiconductors, such as machine learning, magnetic exchange mechanism and computational simulation methods, as well as the design of enhanced ferromagnetism and multi-functional heterostructures, which will provide some reference for the work of scholars in related fields. The author expects that two-dimensional ferromagnetic semiconductors will have more creative development, which is worthy of attention and expectation.
Professor Wang Jinlan is currently working in the school of physics, Southeast University, doctoral supervisor, winner of National Science Fund for Distinguished Young Scholars (2015), second level winner of "333 high level talent support plan" of Jiangsu Province (2016), and special allowance winner of the State Council (2018). He presided over a number of National Natural Science Funds and national key R & D plans, engaged in theoretical research of low dimensional functional materials for a long time, and made a series of important achievements in two-dimensional materials, new energy materials, etc. He has published more than 180 SCI papers, more than 50 papers with more than 10 influencing factors, and has been invited to write 5 English reviews. Cited more than 8000 times, h-index45, has been selected into the "Elsevier list of highly cited scholars in China (2014-2019)" for many years.
Infomat (information materials) is a flagship new magazine jointly founded by Wiley publishing group and University of Electronic Science and technology. Its founding editor is Academician Li Yanrong. The articles published in the journal will involve the synthesis, structure characterization and application in the field of new generation information technology of materials such as electricity, optics and magnetism. Infomat combines Wiley group's high-quality publishing standards with the scientific research advantages of the University of Electronic Science and technology in the information field, aiming to become one of the top international journals in the cross field of information technology and materials.
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