title: Tunable dipolar magnetism in high-spin molecular clusters.
abstract: We report on the Fe17 high-spin molecular cluster and show that this system is an exemplification of nanostructured dipolar magnetism. Each Fe17 molecule, with spin S=35/2 and axial anisotropy as small as D approximately -0.02 K, is the magnetic unit that can be chemically arranged in different packing crystals while preserving both the spin ground state and anisotropy. For every configuration, molecular spins are correlated only by dipolar interactions. The ensuing interplay between dipolar energy and anisotropy gives rise to macroscopic behaviors ranging from superparamagnetism to long-range magnetic order at temperatures below 1 K.
authors.affiliation: National Research Center on nanoStructures and bioSystems at Surfaces (S3), INFM-CNR, Modena, Italy. evange@unimore.it
authors.forename: M
authors.initials: M
authors.lastname: Evangelisti
authors.forename: A
authors.initials: A
authors.lastname: Candini
authors.forename: A
authors.initials: A
authors.lastname: Ghirri
authors.forename: M
authors.initials: M
authors.lastname: Affronte
authors.forename: G W
authors.initials: GW
authors.lastname: Powell
authors.forename: I A
authors.initials: IA
authors.lastname: Gass
authors.forename: P A
authors.initials: PA
authors.lastname: Wood
authors.forename: S
authors.initials: S
authors.lastname: Parsons
authors.forename: E K
authors.initials: EK
authors.lastname: Brechin
authors.forename: D
authors.initials: D
authors.lastname: Collison
authors.forename: S L
authors.initials: SL
authors.lastname: Heath