Magnetic Behavior of Superatom-Fullerene Assemblies

TL;DR

This paper investigates the magnetic properties of superatom-fullerene assemblies through theoretical modeling, highlighting the importance of Dzyaloshinskii-Moriya interactions in reproducing experimental magnetic responses.

Contribution

It introduces a comprehensive model for magnetic superatom assemblies, incorporating anisotropic interactions, to explain experimental magnetic behaviors.

Findings

Dzyaloshinskii-Moriya interactions induce spin canting.

Model reproduces experimental magnetic responses.

Magnetic response varies with assembly size and interaction strengths.

Abstract

It has recently been possible to synthesize ordered assemblies composed of magnetic superatomic clusters Ni9Te6(PEt3)8 separated by C60 and study their magnetic behavior. We have carried out theoretical studies on model systems consisting of magnetic superatoms separated by non-magnetic species to examine the evolution in magnetic response as the nature of the magnetic superatom (directions of spin quantization), the strength of isotropic and anisotropic interactions, the magnetic anisotropy energy, and the size of the assembly are varied. We have examined square planar configurations consisting 16, 24 and 48 sites with 8, 12 and 24 magnetic superatoms respectively. The magnetic atoms are allowed 2 or 5 orientations. The model Hamiltonian includes isotropic exchange interactions with second nearest neighbor ferromagnetic and nearest neighbor antiferromagnetic couplings and anisotropic Dzyaloshinskii-Moriya interactions. It is shown that the inclusion of Dzyaloshinskii-Moriya interaction that cause spin canting is necessary to get qualitative response as observed in experiments.