PARAMAGNETIC FERROMAGNETIC PHASE-TRANSITION DURING GROWTH OF ULTRATHIN CO/CU(001) FILMS

被引：37
|
作者：
SCHUMANN, FO
BUCKLEY, ME
BLAND, JAC
机构：
[1] Cavendish Laboratory, Cambridge CB3 0HE, Madingley Road
来源：
PHYSICAL REVIEW B | 1994年 / 50卷 / 22期
关键词：
D O I：
10.1103/PhysRevB.50.16424
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have investigated the magnetic response of ultrathin paramagnetic Co/Cu(001) films in an applied field using the magneto-optic Kerr effect. We find that the paramagnetic susceptibility χ increases sharply upon Co deposition within a narrow thickness range close to the critical thickness at which the onset of ferromagnetism occurs. We attribute the observed behavior to a geometrical, or percolation phase transition, since the corresponding critical exponent γ=43/18=2.39 agrees well with the experimentally determined value of 2.40±0.07. © 1994 The American Physical Society.
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收藏
页码：16424 / 16427
页数：4
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