Structure and magnetism of MnAu nanoclusters

TitleStructure and magnetism of MnAu nanoclusters
Publication TypeJournal Article
Year of Publication2011
AuthorsWei X, Le Roy D, Skomski R, Li XZ, Sun Z, Shield JE, Kramer MJ, Sellmyer DJ
Journal TitleJournal of Applied Physics
Volume109
Pages07b523
Date Published04/01
Type of ArticleProceedings Paper
ISBN Number0021-8979
Accession NumberISI:000289949000381
Keywordsanomalies, au, neel temperature, shell nanoparticles, transition
Abstract

Equiatomic MnAu clusters with average sizes of 4 and 10 nm are produced by inert-gas condensation. As-produced clusters are used to form both dense cluster films and films with clusters embedded in a W matrix with a cluster volume fraction of 25%. Both structure and magnetism are size-dependent. Structural analysis of the 10 nm clusters indicate a distorted tetragonal body-centered cubic structure with lattice parameters a = 0.315 and c = 0.329 nm. The 4 nm clusters have a partially ordered tetragonal L1(0) structure with lattice parameters a = 0.410 nm and c = 0.395 nm. Magnetic properties of the clusters show evidence at low temperatures of mixed ferromagnetic and antiferromagnetic interactions and ordering as well as paramagnetic spins. Saturation moments are as large as 0.54 mu(B) per average Mn atom. The results are compared with earlier theoretical calculations on bulk MnAu. (C) 2011 American Institute of Physics. [doi:10.1063/1.3559502]

URL<Go to ISI>://000289949000381
DOI10.1063/1.3559502
Alternate JournalJ. Appl. Phys.