Morphology and magnetic properties of W-capped Co nanoparticles

被引：2

作者：

Figueroa, A. I. ^{[1
]}

Bartolome, J. ^{[1
]}

Garcia, L. M. ^{[1
]}

Bartolome, F. ^{[1
]}

Magen, C. ^{[2
]}

Ibarra, A. ^{[2
]}

Ruiz, L. ^{[3
]}

Gonzalez-Calbet, J. M. ^{[3
]}

Petroff, F. ^{[4
,5
]}

Deranlot, C. ^{[4
,5
]}

机构：

[1] Univ Zaragoza, Dept Fis Mat Condensada, Inst Ciencia Mat Aragon, CSIC, E-50009 Zaragoza, Spain

[2] Univ Zaragoza, Dept Fis Mat Condensada, Inst Nanociencia Aragon ARAID, E-50009 Zaragoza, Spain

[3] Univ Complutense Madrid, Dept Quim Inorgan, E-28040 Madrid, Spain

[4] Unite Mixte Phys CNRS Thales, Orsay, France

[5] Univ Paris 11, Orsay, France

来源：

JOURNAL OF APPLIED PHYSICS | 2010年 / 107卷 / 09期

关键词：

AMORPHOUS CO;

D O I：

10.1063/1.3368725

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Co-W nanoparticles formed by sequential sputtering of Co on amorphous alumina substrate and subsequent W capping are studied by high resolution and by scanning transmission electron microscopies, and by superconducting quantum interference device magnetometry. The analysis is focused on W nominal thickness dependence. Results suggest the formation of amorphous Co-W alloy nanoparticles, whose magnetic moment per Co atom is systematically reduced as the nominal thickness of W capping layer increases. The Co-W nanoparticles show superparamagnetic behavior. The activation energy for moment reversal and the effective anisotropy are obtained. (C) 2010 American Institute of Physics. [doi:10.1063/1.3368725]

引用

页数：3

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