Systematic exploration of magnetic mechanism of La3Co29Si4B10 by first principles calculation

被引:2
|
作者
Wang, Xiaoxu [1 ,2 ]
Cheng, Haixia [3 ,4 ]
Su, Ye [1 ]
Qian, Ping [1 ]
机构
[1] Univ Sci & Technol Beijing, Sch Math & Phys, Beijing Adv Innovat Ctr Mat Genome Engn, Beijing Key Lab Magnetophotoelect Composite & Int, Beijing 100083, Peoples R China
[2] Beijing Comp Ctr, Cloud Comp Key Technol & Applicat Beijing Key Lab, Beijing 100094, Peoples R China
[3] Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Peoples R China
[4] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China
关键词
Rare earth transition metal compound; First principles; Structural and electronic properties; Magnetic properties; MAGNETOCALORIC PROPERTIES; CRYSTAL-STRUCTURE; EARTH;
D O I
10.1016/j.commatsci.2020.109853
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Rare earth transition metal compounds with intrinsic and high-performance magnetic behaviors have been attractively research topic as a promising permanent magnets material. In particularly, La3Co29Si4B10 is one of typically rare earth ferromagnetism materials with large magnetic moment and high transition temperature. In order to investigate the magnetic origin of sublattice and guide the design of permanent magnet materials with high magnetic moment and high magnetic crystalline anisotropy, we adopt first principles calculations method to investigate the magnetic mechanism of La3Co29Si4B10 combine local coordination environment with density of states. The results show that the magnetic moment mainly comes from the Co atom. According to the different local symmetry and atom hybridization, the Co atoms at different crystal positions can be divided into high spin state with maximum local magnetic moment at 2c position, low spin state with minimum magnetic moment at 8i1 position and medium spin state corresponding moderate magnetic moment size at other positions. Furthermore, the strain-stress of La3Co29Si4B10 will increase the total magnetic moment. Spin orbital coupling calculation indicate that the easy magnetization direction of La3Co29Si4B10 is along in plane with magnetic crystalline anisotropy energy of 0.68 meV/unit cell, which agreement with experimental. Our calculations lay a theoretical foundation for further experimental design of high-performance permanent magnet materials.
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页数:9
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