Two-dimensional paramagnetic-ferromagnetic phase transition and magnetic anisotropy in Co(110) epitaxial nanoparticle arrays

被引：29

作者：

Gu, E ^{[1
]}

Hope, S ^{[1
]}

Tselepi, M ^{[1
]}

Bland, JAC ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.60.4092

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The coverage-dependent magnetic response and anisotropy of epitaxial Co/Cu(110) nanoparticle arrays were studied. A paramagnetic-ferromagnetic phase transition is found to occur at a critical thickness d(C)=4.6 +/-1.15 ML. In the vicinity of d(C), the paramagnetic susceptibility chi follows a power-law behavior. The observed magnetic phase transition is due to the two-dimensional percolation of epitaxial Co particles with a critical exponent gamma = 2.39 +/- 0.08. At the very onset of the long-range ferromagnetic order, a uniaxial anisotropy induced by the nanoscale Co particles was observed. [S0163-1829(99)10629-5].

引用

页码：4092 / 4095

页数：4

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