Magnetic Enhancement in Cobalt-Manganese Alloy Clusters

Authors

Shuangye Yin, Georgia Institute of Technology
Ramiro Moro, Georgia Institute of Technology
Xiaoshan Xu, University of Nebraska-LincolnFollow
Walter A. de Heer, Georgia Institute of Technology

Date of this Version

2007

Document Type

Article

Citation

PRL 98, 113401 (2007)

Comments

Used by permission.

Abstract

Magnetic moments of Co_NMn_M and Co_NV_M clusters (N ≤ 60; M ≤ N/3) are measured in molecular beams using the Stern-Gerlach deflection method. Surprisingly, the per atom average moments of Co_NMn_M clusters are found to increase with Mn concentration, in contrast to bulk CoMn. The enhancement with Mn doping is found to be independent of cluster size and composition in the size range studied. Meanwhile, Co_NV_M clusters show reduction of average moments with increasing V doping, consistent with what is expected in bulk CoV. The results are discussed within the virtual bound states model.