Van der Waals Stacked 2D-Layered Co2Ge2Te6 with High Curie Temperature and Large Magnetic Crystal Anisotropy

被引:6
作者
Guan, Zhaoyong [1 ,5 ]
Lv, Linhui [1 ]
An, Ziyuan [1 ]
Su, Ya [2 ]
Jiang, Yanyan [3 ]
Wu, Xuming [4 ]
Ni, Shuang [6 ]
机构
[1] Shandong Univ, Sch Chem & Chem Engn, Key Lab Colloid & Interface Chem, Minist Educ, Jinan 250100, Shandong, Peoples R China
[2] Shandong Univ, Sch Elect Engn, Jinan 250100, Shandong, Peoples R China
[3] Shandong Univ, Sch Mat Sci & Engn, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Shandong, Peoples R China
[4] Lingnan Normal Univ, Coll Phys Sci & Technol, Zhanjiang 524048, Peoples R China
[5] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China
[6] China Acad Engn Phys, Res Ctr Laser Fus, Mianyang 621900, Sichuan, Peoples R China
关键词
LARGE VALLEY POLARIZATION; HALF-METALLICITY; FERROMAGNETISM; 1ST-PRINCIPLES; ANTIFERROMAGNETISM; SPINTRONICS; ELECTRONICS; TRANSITION; CHALLENGES; MONOLAYER;
D O I
10.1021/acs.jpcc.2c08648
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Co2Ge2Te6 shows an intrinsic ferromagnetic order, which originates from the superexchange interaction between Co and Te atoms, with a Curie temperature of 161 K. The Co2Ge2Te6 monolayer is half-metal, and the spin-beta electron is a semiconductor with a gap of 1.311 eV. The Co2Ge2Te6 monolayer shows in-plane anisotropy, with a magnetic anisotropy energy (MAE) of -10.2 meV/f.u., and Te atoms contribute -9.94 meV/f.u. Moreover, the bilayer with AA-and ABstackings has MAEs of -24.659 and -24.492 meV/.f.u., respectively. Most interestingly, bilayers present ferromagnetic half-metallicity independent of stacking orders. The multilayers (N >= 6) present ferromagnetic half metal, while magnetoelectronic properties are related with stacking patterns in thinner multilayers. Moreover, the magnetoelectronic properties of bulk are related with stacking patterns. The multilayers' magnetic orders are determined by the super-super exchange and weak van der Waals (vdW) interaction. Moreover, the Co2Ge2Te6 monolayer and multilayers show good dynamical and thermal stability. These findings could pave the way of application of intrinsic ferromagnetic Co2Ge2Te6 in the spintronics.
引用
收藏
页码:5991 / 6001
页数:11
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