Cole-cole analysis of the superspin glass system Co80Fe20/Al2O3

被引：25

作者：

Petracic, O ^{[1
]}

Sahaoo, S

Binek, C

Kleemann, W

Sousa, JB

Cardoso, S

Freitas, PP

机构：

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

[2] Univ Porto, Dept Fis, IFIMUP, P-4169007 Oporto, Portugal

[3] INESC, P-1000 Lisbon, Portugal

来源：

PHASE TRANSITIONS | 2003年 / 76卷 / 4-5期

关键词：

multilayers; Ac susceptibility; polydispersivity; dipolar interactions; spin-glass behavior;

D O I：

10.1080/0141159021000051424

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Ac susceptibility measurements were performed on discontinuous magnetic multilayers [Co80Fe20(t)/Al2O3(3 nm)](10), t = 0.9and 1.0 nm, by Superconducting Quantum Interference Device (SQUID) magnetometry. The CoFe forms nearly spherical ferromagnetic single-domain nanoparticles in the diamagnetic Al2O3 matrix. Due to dipolar interactions and random distribution of anisotropy axes the system exhibits a spin-glass phase. We measured the ac susceptibility as a function of temperature 20 less than or equal to T less than or equal to 100 K at different dc fields and as a function of frequency 0.01 less than or equal to f less than or equal to 1000 Hz. The spectral data were successfully analyzed by use of the phenomenological Cole-Cole model, giving a power-law temperature dependence of the characteristic relaxation time T, and a high value for the polydispersivity exponent, alpha approximate to 0.8, typical of spin glass systems.

引用

页码：367 / 375

页数：9

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