Open AccessFirst-principles calculations of magnetism of Fe atomic sheet
Author(s) -
TH Gao,
DM Lu,
S Y Wu,
ZZ Zhu,
吴顺情
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.047502
Subject(s) - magnetism , bond length , magnetic moment , condensed matter physics , lattice constant , density functional theory , planar , hexagonal lattice , atom (system on chip) , materials science , hexagonal crystal system , square lattice , lattice (music) , physics , crystal structure , crystallography , chemistry , antiferromagnetism , diffraction , ising model , quantum mechanics , computer graphics (images) , computer science , embedded system , acoustics
The electronic and the magnetic properties of Fe single-layered atomic shees separately with two-dimensional square and hexagonal structures are calculated by the first-principles method based on the spin-polarized density functional theory. The calculations show that planar square and hexagonal as well as the bcc structures manifest their magnetisms at their equilibrium lattice constants. The magnetic moments for these structures are 2.65, 2.54 and 2.20μВ, respectively. The calculated magnetic properties for the elongated and the compressed bond lengths suggest that when the bond is stretched to a length larger than 4.40, the bond should be broken and the magnetic moments of the systems reach the magnetic moment of an independent Fe atom, 4μВ. When the bond lengths are reduced, the magnetic moments of all the systems studied decrease correspondingly. At the critical bond lengths (1.80 for planar square lattice, and 1.75 for hexagonal lattice), the magnetisms of the two planar lattices disappear. Using the Stoner theory, the change from magnetism to non-magnetism for the lattice compression is elucidated.