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=-0.02K, is the magnetic unit that can be chemically arranged in different packing crystals whilst preserving both 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 1K.
@article{arxiv.cond-mat/0602184,
title = {Tunable dipolar magnetism in high-spin molecular clusters},
author = {M. Evangelisti and A. Candini and A. Ghirri and M. Affronte and G. W. Powell and I. A. Gass and P. A. Wood and S. Parsons and E. K. Brechin and D. Collison and S. L. Heath},
journal= {arXiv preprint arXiv:cond-mat/0602184},
year = {2007}
}
Comments
Replaced with version accepted for publication in Physical Review Letters