Memory in nanomagnetic systems: Superparamagnetism versus spin-glass behavior

被引：112
作者：
Bandyopadhyay, Malay
Dattagupta, Sushanta
机构：
[1] SN Bose Natl Ctr Basic Sci, Kolkata 700098, India
[2] Jawaharlal Nehru Ctr Adv Sci Res, Bangalore 560064, Karnataka, India
来源：
PHYSICAL REVIEW B | 2006年 / 74卷 / 21期
关键词：
D O I：
10.1103/PhysRevB.74.214410
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The slow dynamics and concomitant memory (aging) effects seen in nanomagnetic systems are analyzed on the basis of two separate paradigms: superparamagnets and spin glasses. It is argued that in a large class of aging phenomena it suffices to invoke superparamagnetic relaxation of individual single domain particles but with a distribution of their sizes. Cases in which interactions and randomness are important in view of distinctive experimental signatures are also discussed.
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页数：7
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