Interface magnetic anisotropy in cobalt clusters embedded in a platinum matrix

[摘要] Noninteracting cobalt clusters containing almost one thousand atoms are embedded in a platinum matrix using a codeposition technique. This one allows us to prepare nanostructured films from miscible elements such as Co/Pt. Deposited clusters keep a pure cobalt core surrounded with an alloyed CoPt interface. Magnetic measurements performed on this cluster assembly reveal a very strong interface anisotropy. Moreover, we find that a simple core-shell model can account for the observed anomalous temperature dependence of the cluster magnetization. (C) 2001 Elsevier Science B.V. All rights reserved.

[发布日期] 2001-12-01

[关键词] magnetic nanoclusters;surface anisotropy;interface effects