Memory effects and KWW relaxation of the interacting magnetic nano-particles


Aydıner E.

PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, vol.572, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 572
  • Publication Date: 2021
  • Doi Number: 10.1016/j.physa.2021.125895
  • Journal Name: PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Artic & Antarctic Regions, INSPEC, Public Affairs Index, zbMATH, Civil Engineering Abstracts
  • Keywords: Superparamagnets, Nano-particles, Nano-devices, Relaxation, KOHLRAUSCH-WILLIAMS-WATTS, DOMAIN HAVRILIAK-NEGAMI, FRACTIONAL DYNAMICS, NANOPARTICLES, RESONANCE, CANCER, HYPERTHERMIA, DEPENDENCE, DIFFUSION, VISCOSITY
  • Istanbul University Affiliated: Yes

Abstract

The nano-particle systems under theoretically and experimentally investigation because of the potential applications in the nano-technology such as drug delivery, ferrofluids mechanics, magnetic data storage, sensors, magnetic resonance imaging, and cancer therapy. Recently, it is reported that interacting nano-particles behave as spin-glasses and experimentally show that the relaxation of these systems obeys stretched exponential i.e., KWW relaxation. Therefore, in this study, considering the interacting nano-particle systems we model the relaxation and investigate frequency and temperature behaviour depends on slow relaxation by using a simple operator formalism. We show that relaxation deviates from Debye and obeys to KWW in the presence of the memory effects in the system. Furthermore, we obtain the frequency and temperature behaviour depend on KWW relaxation. We conclude that the obtained results are consistent with experimental results and the simple model, presented here, is very useful and pedagogical to discuss the slow relaxation of the interacting nano-particles. (C) 2021 Elsevier B.V. All rights reserved.