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Switchable half-metallicity in A-type antiferromagnetic NiI_(2)bilayer coupled with ferroelectric In_(2)Se_(3)

查看全文 作　　者：Yaping [1]Wang;Xinguang [1]Xu;Xian [2]Zhao;Weixiao [3]Ji;Qiang [3]Cao;Shengshi [3]Li;Yanlu [1]Li 高影响力作者 机构地区：[1]State Key Lab of Crystal Materials and Institute of Crystal Materials,Shandong University,250100,Jinan,China;[2]Center for Optics Research and Engineering of Shandong University,Shandong University,266237,Qingdao,China;[3]Spintronics Institute,University of Jinan,250022,Jinan,China高影响力机构 出　　处：《npj Computational Materials》索引2022年第1期,共8页高影响力期刊 基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.12004137 and 11974145);the Key Research and Development Program of Shandong Province(No.2019JZZY010313);Natural Science Foundation of Shandong Province(Grant Nos.ZR2020QA052 and ZR2020ZD28). 摘　　要：Electrically controlled half-metallicity in antiferromagnets is of great significance for both fundamental research and practical application.Here,by constructing van der Waals heterostructures composed of two-dimensional(2D)A-type antiferromagnetic NiI_(2)bilayer(bi-NiI_(2))and ferroelectric In_(2)Se_(3)with different thickness,we propose that the half-metallicity is realizable and switchable in the bi-NiI_(2)proximate to In_(2)Se_(3)bilayer(bi-In_(2)Se_(3)).The polarization flipping of the bi-In_(2)Se_(3)successfully drives transition between half-metal and semiconductor for the bi-NiI_(2).This intriguing phenomenon is attributed to the joint effect of polarization field-induced energy band shift and interfacial charge transfer.Besides,the easy magnetization axis of the bi-NiI_(2)is also dependent on the polarization direction of the bi-In_(2)Se_(3).The half-metallicity and magnetic anisotropy energy of the bi-NiI_(2)in heterostructure can be effectively manipulated by strain.These findings provide not only a feasible strategy to achieve and control half-metallicity in 2D antiferromagnets,but also a promising candidate to design advanced nanodevices. 关 键 词：polarization metallic FERROELECTRIC
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