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				Two-dimensional magnetic material which has been rapidly developed in recent years, has potential applications in developing spintronic devices. In order to understand the magnetic properties of two-dimensional magnetic materials, it is necessary to comprehend the magnetic interaction which is estimated by the exchange parameters between the magnetic atoms. The calculation of the magnetic exchange parameters is based on the first-principle. The commonly used method of determining the values of exchange parameters is energy-mapping. However, this method has some disadvantages. In this paper, the spin-spiral dispersion relationship is derived under the Heisenberg interaction and the Dzyaloshinskii-Moriya (DM) interaction through the generalized Bloch condition of three common two-dimensional magnetic structures: a tetragonal structure, a hexagonal structure in which the cell contains one magnetic atom, a hexagonal structure in which the cell contains two magnetic atoms. The magnetic exchange parameters of some materials are calculated through the first principle. These materials are MnB, VSe 2 MnSTe and Cr 2I 3Cl 3. Among them, the MnSTe and Cr 2I 3Cl 3 are two-dimensional Janus materials, which means that they have space-reversal symmetry broken, that is why there is DM interaction in the system.- 
										Keywords:
										
- two-dimensional magnetic structure /
- magnetic interaction /
- generalized Bloch condition /
- first principles
 [1] Bi C, Liu Y H, Newhouse-Illige T, Xu M, Rosales M, Freeland J W, Mryasov O, Zhang S F, Velthuis S G E, Wang W G 2014 Phys. Rev. Lett. 113 267202 [2] Novoselov K S, Mishchenko A, Carvalho A, Castro Neto A H 2016 Science 353 9439  Google Scholar Google Scholar[3] Wang Z, Gutiérrez-Lezama I, Ubrig N, Kroner M, Gibertini M, Taniguchi T, Watanabe K, Imamoğlu A, Giannini E, Morpurgo A F 2018 Nat. Commun. 9 2516  Google Scholar Google Scholar[4] Hu C, Zhang D, Yan F G, Li Y C, Lv Q S, Zhu W K, Wei Z M, Chang K, Wang K Y 2020 Sci. Bull. 65 1072  Google Scholar Google Scholar[5] Mermin N D, Wagner H 1966 Phys. Rev. Lett. 17 1133  Google Scholar Google Scholar[6] Gong C, Li L, Li Z L, Ji H W, Stern A, Xia Y, Cao T, Bao W, Wang C Z, Wang Y, Qiu Z Q, Cava R J, Louie S G, Xia J, Zhang X 2017 Nature 546 265  Google Scholar Google Scholar[7] Huang B, Clark G, Navarro-Moratalla E, Klein D R, Cheng R, Seyler K L, Zhong D, Schmidgall E, McGuire M A, Cobden D H, Yao W, Xiao D, Jarillo-Herrero P, Xu X D 2017 Nature 546 270  Google Scholar Google Scholar[8] Deng Y, Yu Y, Song Y, Zhang J Z, Wang N Z, Sun Z Y, Yi Y F, Wu Y Z, Wu S W, Zhu J Y, Wang J, Chen X H, Zhang Y B 2018 Nature 563 94  Google Scholar Google Scholar[9] Bonilla M, Kolekar S, Ma Y J, Diaz H C, Kalappattil V, Das R, Eggers T, Gutierrez H R, Phan M H, Batzill M 2018 Nat. Nanotechnol. 13 289  Google Scholar Google Scholar[10] O'Hara D J, Zhu T, Trout A H, Ahmed A S, Luo Y Q, Lee C H, Brenner M R, Rajan S, Gupta J, McComb D W, Kawakami R K 2018 Nano. Lett. 18 3125  Google Scholar Google Scholar[11] Dzyaloshinsky I 1958 J. Phys. Chem. Solids 4 241  Google Scholar Google Scholar[12] Moriya T 1960 Phys. Rev. 120 91  Google Scholar Google Scholar[13] Muehlbauer S, Binz B, Jonietz F, Pfleiderer C, Rosch A, Neubauer A, Georgii R, Böni P 2009 Science 323 915  Google Scholar Google Scholar[14] Zhu Y, Ma C L, Shi D N, Zhang K C 2014 Phys. Lett. A 378 2234  Google Scholar Google Scholar[15] Yang H X, Thiaville A, Rohart S, Fert A, Chshiev M 2015 Phys. Rev. Lett. 115 267210  Google Scholar Google Scholar[16] Pan Y, Zhu Y, Shi D N, Wei X Y, Ma C L, Zhang K C 2015 J. Alloys Compd. 644 341  Google Scholar Google Scholar[17] Xiang H J, Lee C, Koo H J, Gong X G 2013 Dalton Trans. 42 823  Google Scholar Google Scholar[18] Marsman M, Hafner J 2002 Phys. Rev. B 66 224409  Google Scholar Google Scholar[19] Sandratskii L M 1991 J. Phys. Condens. Matter 3 8565  Google Scholar Google Scholar[20] Knöpfle K, Sandratskii L M, Kübler J 2000 Phys. Rev. B 62 5564  Google Scholar Google Scholar[21] Hector A L, Jura M, Levason W, Reid S D, Reid G 2009 New J. Chem. 33 641  Google Scholar Google Scholar[22] Kresse G, Joubert D 1999 Phys. Rev. B 59 1758 [23] Blöchl P E 1994 Phys. Rev. B 50 17953  Google Scholar Google Scholar[24] Farooq M U, Hashmi A, Khan I, Hong J S 2017 Sci. Rep. 7 17101  Google Scholar Google Scholar[25] Liu C, Fu B T, Yin H B, Zhang G B, Dong C 2020 Appl. Phys. Lett. 117 103101  Google Scholar Google Scholar[26] Zhang J, Jia S, Kholmanov I, Dong L, Er D, Chen W B, Guo H, Jin Z H, Shenoy V B, Shi L, Lou J 2017 ACS Nano 11 8192  Google Scholar Google Scholar[27] He J J, Li S 2018 Comput. Mater. Sci. 152 151  Google Scholar Google Scholar[28] Xu C S, Feng J S, Prokhorenko S, Nahas Y, Xiang H J, Bellaiche L 2020 Phys. Rev. B 101 060404  Google Scholar Google Scholar[29] Fert A, Cros V, Sampaio J 2013 Nat. Nanotechnol. 8 152  Google Scholar Google Scholar
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    图 3 (a)六角结构的原胞基矢和倒格基矢的示意图; (b)六角结构的磁性原子及各近邻原子的分布; (c) 磁性原子的磁矩变化坐标系(蓝色坐标轴)以及二维晶格坐标系(黑色坐标轴)示意图 Figure 3. (a) The labeled a 1 and a 2 are basis vectors and b 1 and b 2 are reciprocal lattice vectors. (b) distribution of neighboring atoms; (c) blue axis and black axis represent the coordinate system of magnetic moment and two dimensional lattice , respectively. 图 9 (a)离散点是MnSTe体系通过程序计算得到的自旋螺旋能量色散关系 E( q )和 E(– q ), 其中 q 是自旋螺旋的波矢, 实线是拟合曲线; (b)离散点是MnSTe体系通过程序计算的 E( q )与 E(– q )之间的能量差 E DMI( q ), 实线是拟合曲线 Figure 9. (a) Scatter symbols are energy dispersion E( q ) and E(– q ) of MnSTe as a function of the spiral wave vector q calculated by program, lines are fitted ones; (b) scatter symbols are E DMI( q ) which means the difference between E( q ) and E(– q ), lines are fitted ones. 图 11 (a)离散点是Cr 2I 3Cl 3体系通过程序计算得到的自旋螺旋能量色散关系 E( q )和 E(– q ), 其中 q 是自旋螺旋的波矢, 实线是拟合曲线; (b)离散点是Cr 2I 3Cl 3体系通过程序计算的 E( q )与 E(– q )之间的能量差 E DMI( q ), 实线是拟合曲线 Figure 11. (a) Scatter symbols are energy dispersion E( q ) and E(– q ) of Cr 2I 3Cl 3 as a function of the spiral wave vector q calculated by program, lines are fitted ones; (b) scatter symbols are E DMI( q ) which means the difference between E( q ) and E(– q ), lines are fitted ones. 表 1 VSe 2结构中磁性原子各近邻的海森伯交换参数大小(单位: meV) Table 1. Calculated parameters of Heisenberg exchange J of VSe 2, J is considered to the eighth neighbor. (The unit of J is meV). J 1 J 2 J 3 J 4 J 5 J 6 J 7 J 8 27.24 12.81 –2.8 0.59 –1 –1.5 –0.5 0.38 表 2 MnB结构( U= 3 eV)中磁性原子各近邻的海森伯交换参数大小(单位: meV) Table 2. Calculated parameters of Heisenberg exchange J of MnB, J is considered to the eighth neighbor. (The unit of J is meV). J 1 J 2 J 3 J 4 J 5 J 6 J 7 J 8 21.22 44.5 –2.52 –4.53 0.952 1.08 0.569 1.27 表 3 MnSTe结构中磁性原子各近邻的海森伯交换参数大小(单位: meV) Table 3. Calculated parameters of Heisenberg exchange J of MnSTe, J is considered to the eighth neighbor. (The unit of J is meV). J 1 J 2 J 3 J 4 J 5 J 6 J 7 J 8 5.49 4.64 6 –1.09 –1.32 0.765 –0.046 0.76 表 4 MnSTe结构中磁性原子各近邻的DM交换参数大小(单位: meV) Table 4. Calculated parameters of DM exchange d of MnSTe, d is considered to the forth neighbor. (The unit of d is meV). d 1 d 2 d 3 d 4 5.46 1.77 2.78 –0.248 表 5 Cr 2I 3Cl 3结构中磁性原子各近邻的海森伯交换参数大小(单位: meV) Table 5. Calculated parameters of Heisenberg exchange J of Cr 2I 3Cl 3, J is considered to the eighth neighbor. (The unit of J is meV). J 1 J 2 J 3 J 4 J 5 J 6 J 7 J 8 12.92 –0.35 2.11 3.55 –1.46 –0.67 –0.11 0.841 表 6 Cr 2I 3Cl 3结构中磁性原子各近邻的DM交换参数大小(单位: meV) Table 6. Calculated parameters of DM exchange d of Cr 2I 3Cl 3, d is considered to the forth neighbor. (The unit of d is meV). d 1 d 2 d 3 d 4 –0.88 0.378 1.04 –0.0493 
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[1] Bi C, Liu Y H, Newhouse-Illige T, Xu M, Rosales M, Freeland J W, Mryasov O, Zhang S F, Velthuis S G E, Wang W G 2014 Phys. Rev. Lett. 113 267202 [2] Novoselov K S, Mishchenko A, Carvalho A, Castro Neto A H 2016 Science 353 9439  Google Scholar Google Scholar[3] Wang Z, Gutiérrez-Lezama I, Ubrig N, Kroner M, Gibertini M, Taniguchi T, Watanabe K, Imamoğlu A, Giannini E, Morpurgo A F 2018 Nat. Commun. 9 2516  Google Scholar Google Scholar[4] Hu C, Zhang D, Yan F G, Li Y C, Lv Q S, Zhu W K, Wei Z M, Chang K, Wang K Y 2020 Sci. Bull. 65 1072  Google Scholar Google Scholar[5] Mermin N D, Wagner H 1966 Phys. Rev. Lett. 17 1133  Google Scholar Google Scholar[6] Gong C, Li L, Li Z L, Ji H W, Stern A, Xia Y, Cao T, Bao W, Wang C Z, Wang Y, Qiu Z Q, Cava R J, Louie S G, Xia J, Zhang X 2017 Nature 546 265  Google Scholar Google Scholar[7] Huang B, Clark G, Navarro-Moratalla E, Klein D R, Cheng R, Seyler K L, Zhong D, Schmidgall E, McGuire M A, Cobden D H, Yao W, Xiao D, Jarillo-Herrero P, Xu X D 2017 Nature 546 270  Google Scholar Google Scholar[8] Deng Y, Yu Y, Song Y, Zhang J Z, Wang N Z, Sun Z Y, Yi Y F, Wu Y Z, Wu S W, Zhu J Y, Wang J, Chen X H, Zhang Y B 2018 Nature 563 94  Google Scholar Google Scholar[9] Bonilla M, Kolekar S, Ma Y J, Diaz H C, Kalappattil V, Das R, Eggers T, Gutierrez H R, Phan M H, Batzill M 2018 Nat. Nanotechnol. 13 289  Google Scholar Google Scholar[10] O'Hara D J, Zhu T, Trout A H, Ahmed A S, Luo Y Q, Lee C H, Brenner M R, Rajan S, Gupta J, McComb D W, Kawakami R K 2018 Nano. Lett. 18 3125  Google Scholar Google Scholar[11] Dzyaloshinsky I 1958 J. Phys. Chem. Solids 4 241  Google Scholar Google Scholar[12] Moriya T 1960 Phys. Rev. 120 91  Google Scholar Google Scholar[13] Muehlbauer S, Binz B, Jonietz F, Pfleiderer C, Rosch A, Neubauer A, Georgii R, Böni P 2009 Science 323 915  Google Scholar Google Scholar[14] Zhu Y, Ma C L, Shi D N, Zhang K C 2014 Phys. Lett. A 378 2234  Google Scholar Google Scholar[15] Yang H X, Thiaville A, Rohart S, Fert A, Chshiev M 2015 Phys. Rev. Lett. 115 267210  Google Scholar Google Scholar[16] Pan Y, Zhu Y, Shi D N, Wei X Y, Ma C L, Zhang K C 2015 J. Alloys Compd. 644 341  Google Scholar Google Scholar[17] Xiang H J, Lee C, Koo H J, Gong X G 2013 Dalton Trans. 42 823  Google Scholar Google Scholar[18] Marsman M, Hafner J 2002 Phys. Rev. B 66 224409  Google Scholar Google Scholar[19] Sandratskii L M 1991 J. Phys. Condens. Matter 3 8565  Google Scholar Google Scholar[20] Knöpfle K, Sandratskii L M, Kübler J 2000 Phys. Rev. B 62 5564  Google Scholar Google Scholar[21] Hector A L, Jura M, Levason W, Reid S D, Reid G 2009 New J. Chem. 33 641  Google Scholar Google Scholar[22] Kresse G, Joubert D 1999 Phys. Rev. B 59 1758 [23] Blöchl P E 1994 Phys. Rev. B 50 17953  Google Scholar Google Scholar[24] Farooq M U, Hashmi A, Khan I, Hong J S 2017 Sci. Rep. 7 17101  Google Scholar Google Scholar[25] Liu C, Fu B T, Yin H B, Zhang G B, Dong C 2020 Appl. Phys. Lett. 117 103101  Google Scholar Google Scholar[26] Zhang J, Jia S, Kholmanov I, Dong L, Er D, Chen W B, Guo H, Jin Z H, Shenoy V B, Shi L, Lou J 2017 ACS Nano 11 8192  Google Scholar Google Scholar[27] He J J, Li S 2018 Comput. Mater. Sci. 152 151  Google Scholar Google Scholar[28] Xu C S, Feng J S, Prokhorenko S, Nahas Y, Xiang H J, Bellaiche L 2020 Phys. Rev. B 101 060404  Google Scholar Google Scholar[29] Fert A, Cros V, Sampaio J 2013 Nat. Nanotechnol. 8 152  Google Scholar Google Scholar
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