Magnetic simulations of core–shell ferromagnetic bi-magnetic nanoparticles: The influence of antiferromagnetic interfacial exchange

Juan A. Ramos-Guivar, Carlo A. Tamanaha-Vegas, Fred Jochen Litterst, Edson C. Passamani

Research output: Contribution to journalArticlepeer-review

Abstract

Magnetic properties of ferromagnetic nanostructures were studied by atomistic simulations following Monte Carlo and Landau–Lifshitz–Gilbert approaches. First, we investigated the influence of particle size and shape on the temperature dependence of magnetization for single cobalt and gadolinium nanoparticles and also in bi-magnetic Co@Gd core–shell nanoparticles with different sizes. The Landau–Lifshitz–Gilbert approach was subsequently applied for inspecting the magnetic hysteresis behavior of 2 and 4 nm Co@Gd core–shell nanoparticles with negative, positive, and zero values of interfacial magnetic exchange. We were able to demonstrate the influence of finite-size effect on the dependence of the Curie temperature of Co and Gd nanoparticles. In the Co@Gd core–shell framework, it was possible to handle the critical temperature of the hybrid system by adjusting the Co core size. In addition, we found an improvement in the coercive field values for a negative interfacial exchange energy and for a different core size, suggesting an exchange spring behavior, while positive and zero values of interfacial exchange constant showed no strong influence on the hysteresis behavior.

Original languageEnglish
Article number1381
JournalNanomaterials
Volume11
Issue number6
DOIs
StatePublished - Jun 2021

Bibliographical note

Funding Information:
This research was funded by Fondo Nacional de Desarrollo Cient?fico, Tecnol?gico y de Innovaci?n Tecnol?gica (FONDECYT-CONCYTEC), Project number 177-2020-FONDECYT.

Funding Information:
Funding: This research was funded by Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica (FONDECYT-CONCYTEC), Project number 177-2020-FONDECYT.

Funding Information:
Acknowledgments: The authors thank the Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica (FONDECYT-CONCYTEC), Project number 177-2020-FONDECYT, UFES and FAPES, CNPq for financial support.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Atomistic simulation
  • Core–shell bi-magnetic nanoparticles
  • Interfacial exchange
  • Monte Carlo simulation

Fingerprint Dive into the research topics of 'Magnetic simulations of core–shell ferromagnetic bi-magnetic nanoparticles: The influence of antiferromagnetic interfacial exchange'. Together they form a unique fingerprint.

Cite this