Superparamagnetism versus superspin glass behavior in dilute magnetic nanoparticle systems

被引：169

作者：

Chen, X ^{[1
]}

Bedanta, S

Petracic, O

Kleemann, W

Sahoo, S

Cardoso, S

Freitas, PP

机构：

[1] Univ Duisburg Essen, D-47048 Duisburg, Germany

[2] Univ Nebraska, Dept Phys & Astron, Behlen Lab Phys, Lincoln, NE 68588 USA

[3] INESC, P-1000 Lisbon, Portugal

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.72.214436

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetization of diluted nanoparticle systems [Co80Fe20(t(n))/Al2O3(3 nm)](10) with t(n)=0.7 and 0.5 nm reveals strong paramagnetic contributions at low temperatures. They are due to atomically small magnetic clusters, which are undetectable in transmission electron microscopy and surround nanoparticles with saturating field-cooled magnetization. Zero field memory effects unequivocally discriminate between superspin glass and superparamagnetic behavior for t(n)=0.7 and 0.5 nm, respectively.

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页数：5

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