title: Magnetic behavior of superatomic-fullerene assemblies.
abstract: It has recently been possible to synthesize ordered assemblies composed of magnetic superatomic clusters Ni9Te6(PEt3)8separated by C60and 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 of 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.
authors.affiliation: Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, VA, USA. jatulasimha@vcu.edu.
authors.forename: Pallabi
authors.initials: P
authors.lastname: Sutradhar
authors.affiliation: Department of Physics, Virginia Commonwealth University, Richmond, VA, USA. snkhanna@vcu.edu.
authors.forename: Vikas
authors.initials: V
authors.lastname: Chauhan
authors.affiliation: Department of Physics, Virginia Commonwealth University, Richmond, VA, USA. snkhanna@vcu.edu.
authors.forename: Shiv N
authors.initials: SN
authors.lastname: Khanna
authors.affiliation: Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, VA, USA. jatulasimha@vcu.edu.
authors.forename: Jayasimha
authors.initials: J
authors.lastname: Atulasimha