title: Magnetic and transport properties of Fe4single-molecule magnets: a theoretical insight.
abstract: Here, methods of density functional theory (DFT) were employed to study the magnetic and transport properties of a star-shaped single-molecule magnet Fe4S = 5 complex deposited on a gold surface. The study devoted to the magnetic properties focused on changes in the exchange coupling constants and magnetic anisotropy (zero-field splitting parameters) of the isolated and deposited molecules. Molecule-surface interactions induced significant changes in the antiferromagnetic exchange coupling constants because these depend closely on the geometry of the metal complex. Meanwhile, the magnetic anisotropy remained almost constant. Transport properties were analysed using two different approaches. First, we studied the change in magnetic anisotropy by reducing and oxidizing the Fe4complex as in a Coulomb blockade mechanism. Then we studied the coherent tunnelling using DFT methods combined with Green functions. Spin filter behaviour was found because of the different numbers of alpha and beta electrons, due to the S = 5 ground state.
authors.affiliation: Ingénierie Moléculaire et Matériaux Organiques, UMR 6501, Boulevard Lavoisier, Université d'Angers, F-49045 Angers, France.
authors.forename: Nuria
authors.initials: N
authors.lastname: Gallego-Planas
authors.affiliation: Departament de Química Inorgànica i Orgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain.
authors.forename: Alejandro
authors.identifier: http://orcid.org/0000-0003-1676-5502
authors.initials: A
authors.lastname: Martín-Rodríguez
authors.affiliation: Departament de Química Inorgànica i Orgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain.
authors.forename: Eliseo
authors.identifier: http://orcid.org/0000-0001-9097-8499
authors.initials: E
authors.lastname: Ruiz