Relaxation and aging of a superferromagnetic domain state

被引：53

作者：

Chen, X ^{[1
]}

Kleemann, W

Petracic, O

Sichelschmidt, O

Cardoso, S

Freitas, PP

机构：

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

[2] INESC, P-1000 Lisbon, Portugal

来源：

PHYSICAL REVIEW B | 2003年 / 68卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.68.054433

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In agreement with recent model calculations on interacting magnetic nanoparticles the magnetic relaxation of a field-cooled superferromagnetic (SFM) granular multilayer [Co80Fe20(1.4 nm)/Al2O3(3 nm)](10) follows a power-law decay retaining a finite asymptotic remanence. Unexpectedly, a second isothermal upward relaxation is observed after field quenching the sample. It is attributed to slow equilibration of the thermoremanent magnetization inside the SFM domains. Magnetization hole burning via aging reveals the chaotic nature of the domain state.

引用

页数：5

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