Magnetic Interactions and Band Gaps of the(CrO_(2))_(2)/(MgH_(2))_(n) Superlattices  

作　　者：Wanfei Shan Jiangtao Du Weidong Luo 

机构地区：[1]Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education),School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [2]Institute of Natural Sciences,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Chinese Physics Letters》2022年第11期57-62,共6页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 11521404);the Materials Genome Initiative Center of Shanghai Jiao Tong University (SJTU)。

摘　　要：Lattice superlattices constructed with different materials such as ferromagnets and insulators at atomic scale provide an ideal platform for exploring many emergent physical phenomena.In the present work,a new type of superlattices composed of ferromagnetic half-metal CrO_(2),with a thickness of two atomic layers,together with insulating MgH_(2) are constructed.Systematic theoretical studies on the(CrO_(2))_(2)/(MgH_(2))_(n) (n=2,3,4,5,6)superlattices are carried out based on first-principles density-functional theory calculations.These superlattices are ferromagnetic semiconductors with similar intra-layer magnetic exchange couplings between Cr ions.As the thickness of the MgH_(2) layer increases,the magnetic exchange interaction between inter-layer Cr ions shows oscillating decaying behavior,while the energy band gaps show a small increase.The understanding of magnetic couplings in these superlattices provides a pathway for constructing new ferromagnetic semiconductors.

关 键 词：FERROMAGNETIC COUPLING LAYER 

分 类 号：O469[理学—凝聚态物理]