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Magnetism of small Mn clusters
Author(s) -
Guevara Javier,
María Llois Ana,
AguileraGranja F.,
MontejanoCarrizales J. M.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301837
Subject(s) - icosahedral symmetry , magnetism , condensed matter physics , hamiltonian (control theory) , ferromagnetism , tight binding , electronic structure , magnetic moment , atomic orbital , materials science , physics , chemistry , crystallography , quantum mechanics , mathematics , mathematical optimization , electron
Abstract The role of structure on the magnetic properties of Mn clusters is investigated by performing calculations for different growth families, icosahedral, bcc and fcc. The spin‐polarized electronic properties of these geometries are calculated by solving an spd tight‐binding Hubbard‐like Hamiltonian in the unrestricted Hartree–Fock approximation by using a bulk‐like parametrization, extra orbitals of s‐like character being added to take into account spillover effects present in transition metal clusters. Conclusions about the possible structure of these clusters as a function of size are drawn by comparison with recent experimental results. We find that for small clusters the preferred structure is mainly icosahedral while for larger sizes ( N ≥ 30) the bcc structure begins to compete with the icosahedral one. The magnetic coupling within the clusters is non‐ferromagnetic.