Surface magnetism of ferromagnetic ultrafine particles |
| |
Authors: | Peng Zhen Hua Li Weijun Hu and Liangmo Mei |
| |
Institution: | Department of Physics, Shandong University, Jinan 250100, China |
| |
Abstract: | The electronic structures and atomic magnetic moments of Nin clusters (n= 2—6) have been studied. Compared with crystalline nickel, some clusters increase obviously in magnetism; some
decrease obviously; and some show ferrimagnetism. The symmetry of clusters has great effect on magnetic moment. If they are
similar in symmetry, the clusters are similar in magnetic moment. The magnetic moment for small clusters does not seem to
increase or decrease monotonically with the change in their size, because adding or removing one atom may fully change the
symmetry of small clusters. As the surface layer of ultrafine particles is made of many different polyhedrons with low symmetry
and the alignment of the polyhedrons is complicated, the whole surface layer presents short-range order. The calculated results
explain the abnormal phenomena about surface magnetism that have been in existence for a long time. |
| |
Keywords: | clusters magnetism electronic moment |
本文献已被 万方数据 SpringerLink 等数据库收录! |