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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Role of Dipolar Interactions and Volume Particle Size Distribution on the Nonmonotonic Magnetic Field Dependence of the Blocking Temperature in Magnetic Nanoparticles

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Author(s):
Masunaga, Sueli H. [1] ; Jardim, Renato F. [1] ; Correia, Marcos J. [2] ; Figueiredo, Wagner [2]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, SP - Brazil
[2] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 120, n. 1, p. 765-770, JAN 14 2016.
Web of Science Citations: 3
Abstract

The nonmonotonic behavior of the magnetic field dependence H of the superparamagnetic blocking temperature T-B(H) (or T-max(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 T-max(H). (AU)

FAPESP's process: 14/19245-6 - Search for novel superconducting materials
Grantee:Renato de Figueiredo Jardim
Support Opportunities: Scholarships abroad - Research
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC