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Structural and Magnetic Evolution of Bimetallic MnAu Clusters Driven by Asymmetric Atomic Migration

TitleStructural and Magnetic Evolution of Bimetallic MnAu Clusters Driven by Asymmetric Atomic Migration
Publication TypeJournal Article
Year of Publication2014
AuthorsWei, XH, Zhou, RL, Lefebvre, W, He, K, Le Roy, D, Skomski, R, Li, XZ, Shield, JE, Kramer, MJ, Chen, S, Zeng, XC, Sellmyer, DJ
JournalNano Letters
Volume14
Pagination1362-1368
Date Published03
Type of ArticleArticle
ISBN Number1530-6984
Accession NumberWOS:000335720300041
Keywordsannealing, Bimetallic nanoparticles, core-shell nanoparticles, evolution, fept nanoparticles, fuel-cell, gold, manganese, nanocrystals, Ostwald ripening, particles, phase transformation, size, structure-property correlation, structure/composition/morphology, transition
Abstract

The nanoscale structural, compositional, and magnetic properties are examined for annealed MnAu nanoclusters. The MnAu clusters order into the L1(0) structure, and monotonic size-dependences develop for the composition and lattice parameters, which are well reproduced by our density functional theory calculations. Simultaneously, Mn diffusion forms 5 angstrom nanoshells on larger clusters inducing significant magnetization in an otherwise antiferromagnetic system. The differing atomic mobilities yield new cluster nanostructures that can be employed generally to create novel physical properties.

DOI10.1021/nl404412w
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Structures and Dynamics