Paramagnetic-ferromagnetic phase transition and magnetic properties of ultrathin CoFe/Cu(110) films

被引：13
|
作者：
Kuepper, D. [1 ]
Easton, S. [1 ]
Bland, J. A. C. [1 ]
机构：
[1] Univ Cambridge, Cavevdish Lab, Cambridge CB3 0HE, England
来源：
JOURNAL OF APPLIED PHYSICS | 2007年 / 102卷 / 08期
关键词：
D O I：
10.1063/1.2795681
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We present the results of a systematic investigation of the coverage-dependent magnetic response and anisotropy of ultrathin Co75Fe25/Cu(110) films using the magneto-optic Kerr effect. A paramagnetic-ferromagnetic phase transition is found to occur at a critical thickness d(c)=4.0 +/- 0.25 ML. In the vicinity of d(c), the paramagnetic susceptibility chi follows a power law with a critical exponent of gamma=2.385 +/- 0.069 in excellent agreement with the theoretical value for a perfect two-dimensional geometric percolation phase transition. At the very onset of ferromagnetic order, a mixture of cubic and uniaxial anisotropy was observed. (C) 2007 American Institute of Physics.
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页数：4
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