Tunable dipolar magnetism in high-spin molecular clusters

TL;DR

This paper investigates the magnetic properties of Fe17 high-spin molecular clusters, demonstrating tunable dipolar magnetism and various macroscopic magnetic behaviors depending on molecular packing arrangements.

Contribution

It introduces a new high-spin molecular cluster system where dipolar interactions can be tuned through chemical packing without altering the spin ground state or anisotropy.

Findings

Demonstrates tunable dipolar magnetic behavior in Fe17 clusters.

Shows transition from superparamagnetism to long-range order below 1K.

Highlights the role of dipolar interactions in nanoscale magnetism.

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=-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.