Memory in a magnetic nanoparticle system: polydispersity and interaction effects
Memory in a magnetic nanoparticle system: polydispersity and interaction effects
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DOI：
10.1103/physrevb.71.054401
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发表时间：
2005-02
影响因子：
3.7
通讯作者：
S. Chakraverty;M. Bandyopadhyay;S. Chatterjee;S. Dattagupta;A. Frydman;S. Sengupta;P. Sreeram
中科院分区：
文献类型：
--
作者：
S. Chakraverty;M. Bandyopadhyay;S. Chatterjee;S. Dattagupta;A. Frydman;S. Sengupta;P. Sreeram
我们在这里报告的理论弛豫的单畴磁性纳米粒子，适当的穆斯堡尔谱，磁化强度响应，和磁滞回线的测量分析。我们特别关注的理论公式是磁粒子之间的偶极相互作用的存在。我们详细讨论了相互作用以及颗粒尺寸分布对测量的弛豫谱和不可逆的，非平衡磁化响应场冷却和零场冷却的情况下的效果。一些记忆效应，类似于在自旋玻璃系统中看到的记忆效应，可以通过调整相互作用和颗粒尺寸而应用于重要的器件应用。
We report here a theory of relaxation of single domain magnetic nanoparticles, appropriate for analyzing measurements of Mossbauer spectra, magnetization response, and hysteretic coercivity. Our special focus of attention in the theoretical formulation is the presence of dipolar interaction between the magnetic particles. We discuss in detail the effect of interaction as well as particle size distribution on the measured relaxation spectra and irreversible, nonequilibrium magnetization response in field-cooled and zero-field-cooled situations. Some of the memory effects, similar to those seen in spin glass systems, may be put to important device applications by tuning the interaction and the particle size.