Role of Dipolar Interactions and Volume Particle Size Distribution on the Nonmonotonic Magnetic Field Dependence of the Blocking Temperature in Magnetic Nanoparticles
详细信息 查看全文
- 作者：Sueli H. Masunaga ; Renato F. Jardim ; Marcos J. Correia ; Wagner Figueiredo
- 刊名：Journal of Physical Chemistry C
- 出版年：2016
- 出版时间：January 14, 2016
- 年：2016
- 卷：120
- 期：1
- 页码：765-770
- 全文大小：343K
- ISSN：1932-7455
文摘
The nonmonotonic behavior of the magnetic field dependence H of the superparamagnetic blocking temperature TB(H) (or Tmax(H)) of an assembly of magnetic nanoparticles NPs was studied both experimentally and theoretically. We have combined the measurements of zero-field cooling ZFC magnetization curves under H performed on samples with increasing concentration of Ni nanoparticles and Monte Carlo simulations. As a result, we have found that increasing the strength of the dipolar interaction between granules and the occurrence of a very narrow width of a log-normal volume particle size distribution of the NPs suppress the nonmonotonic behavior of Tmax(H).