摘要Electronic structures and magnetoresistance (MR) of Co3Cu5 and Co3Cu7 models as well as their interface atom exchange models Co2CuCoCu4 and Co2CuCoCu6 are investigated by the first-principles pseudopotential plane-wave method based on density functional theory. Charge transfer, magnetic moment, density of states, spin asymmetry factor, and MR ratio are discussed. The results show that the values of charge transfer and spin asymmetry factor at the Fermi level of Co layers are closely related to the neighbouring background of the Co layer. The Co layer with two sides adjacent to the Cu layer would transfer more charge to the Cu layer than other neighbouring background and have the largest spin asymmetry factor at the Fermi level. The Co layer with two neighbouring Co layers (interior Co) would gain a little charge and have the smallest spin asymmetry factor at the Fermi level. Two-current model is used to evaluate the MR ratio of Co2CuCoCu_4 (Co2CuCoCu6) to be larger than that of Co3Cu5 (Co3Cu7), which can be explained by the charge transfer and spin asymmetry factor.
Abstract：Electronic structures and magnetoresistance (MR) of Co3Cu5 and Co3Cu7 models as well as their interface atom exchange models Co2CuCoCu4 and Co2CuCoCu6 are investigated by the first-principles pseudopotential plane-wave method based on density functional theory. Charge transfer, magnetic moment, density of states, spin asymmetry factor, and MR ratio are discussed. The results show that the values of charge transfer and spin asymmetry factor at the Fermi level of Co layers are closely related to the neighbouring background of the Co layer. The Co layer with two sides adjacent to the Cu layer would transfer more charge to the Cu layer than other neighbouring background and have the largest spin asymmetry factor at the Fermi level. The Co layer with two neighbouring Co layers (interior Co) would gain a little charge and have the smallest spin asymmetry factor at the Fermi level. Two-current model is used to evaluate the MR ratio of Co2CuCoCu_4 (Co2CuCoCu6) to be larger than that of Co3Cu5 (Co3Cu7), which can be explained by the charge transfer and spin asymmetry factor.
LU Shuo;SHANG Jia-Xiang;ZHANG Yue. Influence of Interface Structure of Co/Cu (100) Superlattices on Electronic Structure and Giant Magnetoresistance[J]. 中国物理快报, 2007, 24(11): 3229-3232.
LU Shuo, SHANG Jia-Xiang, ZHANG Yue. Influence of Interface Structure of Co/Cu (100) Superlattices on Electronic Structure and Giant Magnetoresistance. Chin. Phys. Lett., 2007, 24(11): 3229-3232.
[1] Baibich M N, Broto J M, Fert A et al 1988 Phys. Rev.Lett. 61 2472 [2] Kano H, Kagawa K, Suzuki A et al 1993 Appl. Phys. Lett. 632839 [3] Schep K M, Kelly P J and Bauer G E W 1998 Phys. Rev. B 57 8907 [4]Shang J X and Zhao X D 2006 Chin. Phys. Lett. 23 1282 [5] Asano Y, Oguri A, and Maekawa S 1993 Phys. Rev. B 48 6192 [6] Prados C, Dimitrov D V and Hadjipanayis G C 1999 J. Magn. Magn.Mater. 19-26 192 [7] Parkin S S P 1993 Phys. Rev. Lett. 71 1641 [8] Zhao Z C,Wang H, Xiao S Q, Huang D et al 2006 J. Appl.Phys. 99 08R507 [9] Kudrnovsky J, Drchal V, Blaas C et al 2000 Phys. Rev. B 62 15084 [10] Shang J X, Zhao X D, Zhang Y et al 2006 Int. J. Mod. Phys.B 20 3623 [11] Segall M D, Lindan P J D, Probert M J et al 2002 J. Phys.:Condens. Matter 14 2717 [12]Mathon J, Umerski A and Villeret M 1997 Phys. Rev. B 55 14378 [13] Hansen M 1958 Constitution of Binary Alloys (New York:McGraw-Hill) [14] Mulliken R S 1955 J. Chem. Phys. 23 1833 [15] Vlaic P, Alouani M and Dreyss\'e H 2004 J. Appl. Phys. 96 4352 [16] Kong L T, Zhang R F, Li Z C et al 2003 Phys. Rev. B 68134446 [17] Mott N F 1964 Adv. Phys. 13 325 [18] Itoh H, Inoue J and Maekawa S 1993 Phys. Rev. B 47 5809 [19] Hummel R E 2001 Electronic Properties of Materials ThirdEdition (New York: McGraw-Hill) p86
2007, Vol. 24 
