DIMENSIONAL CROSSOVER IN ULTRATHIN NI(111) FILMS ON W(110)

被引：279
|
作者：
LI, Y
BABERSCHKE, K
机构：
[1] Institut F̈r Experimentalphysik, Freie Universität Berlin, D-1000 Berlin 33
来源：
PHYSICAL REVIEW LETTERS | 1992年 / 68卷 / 08期
关键词：
D O I：
10.1103/PhysRevLett.68.1208
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In situ magnetic resonance measurements of ultrathin Ni(111) on W(110) prepared in ultrahigh vacuum have been carried out to determine the thickness dependence of the critical exponent-beta and the Curie temperature T(C). We find that beta changes drastically from 0.30 to 0.13 between 7 and 5 monolayers. We attribute this behavior to a crossover from a three- to a two-dimensional magnetic behavior. The observed T(C)'s and linewidths also exhibit the effect of the dimensional crossover. Ni films less-than-or-equal-to 4 layers thick show a truly two-dimensional magnetic phase transition with beta = 0.13.
引用
收藏
页码：1208 / 1211
页数：4
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