Energy Evolution, Stabilization, and Mechanotransducer Properties of Fe3O4 Vortex Nanorings and Nanodisks

Gopal Niraula, Denilson Toneto, Elma Joshy, Jose A. H. Coaquira, Ahmad I. Ayesh, Flavio Garcia, Diego Muraca, Juliano C. Denardin, Gerardo F. Goya, and Surender K. Sharma
Phys. Rev. Applied 16, 024002 – Published 2 August 2021
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Abstract

Recent reports on spin structures produced in nanomaterials due to confinement of spins imposed by geometrical restrictions are at the center of rising scientific interest. Topological curling magnetic structures (vortices) exhibit unique properties, regarding the energy profile, good colloidal stability in suspensions, manipulation under a low-frequency magnetic field, and torque exertion. The last property provides the potential to mechanically eradicate cancer cells via magnetomechanical actuation using remote ac magnetic fields. Here, we study, theoretically and by micromagnetic simulations, the magnetic energy evolutions for vortex nanosystems, i.e., Fe3O4 nanodisks (NDs) and nanorings (NRs). The obtained results for magnetic energy, magnetic susceptibility, and magnetization reversal confirm that the vortex-domain structure in NRs exhibits better stability and avoids agglomeration in solution, owing to the presence of a central hole, whereas the presence of a vortex core in NDs induces magnetic remanence. Although NDs are found to exert slightly higher torques than NRs, this weakness can be compensated for by a small increase (i.e., approximately equals 20%) in the amplitude of the applied field. Our results provide evidence of the magnetic stability of the curling ground states in NRs and open the possibility of applying these systems to magnetomechanical actuation on single cells for therapeutics in biomedicine, such as cancer-cell destruction by low-frequency torque transduction.

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  • Received 24 March 2021
  • Revised 23 June 2021
  • Accepted 12 July 2021

DOI:https://doi.org/10.1103/PhysRevApplied.16.024002

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Gopal Niraula1,2, Denilson Toneto3, Elma Joshy4, Jose A. H. Coaquira2, Ahmad I. Ayesh5,6, Flavio Garcia7, Diego Muraca8, Juliano C. Denardin9, Gerardo F. Goya10, and Surender K. Sharma1,4,*

  • 1Department of Physics, Federal University of Maranhao, Sao Luis 65080-805, Brazil
  • 2Laboratory of Magnetic Materials, NFA, Institute of Physics, University of Brasilia, Brasilia 70910-900, Brazil
  • 3Departamento de Física, Universidade Federal de Santa Maria, UFSM, Santa Maria, RS 97105-900, Brazil
  • 4Department of Physics, Central University of Punjab, Bathinda, 151401, India
  • 5Center for Sustainable Development, Qatar University, P.O. Box 2713, Doha, Qatar
  • 6Department of Mathematics, Statistics and Physics, Qatar University, P.O. Box 2713, Doha, Qatar
  • 7Brazilian Center for Research in Physics - CBPF, Rio de Janeiro - RJ, 22290-180, Brazil
  • 8Institute of Physics “Gleb Wataghin” (IFGW), University of Campinas, Campinas, Brazil
  • 9CEDENNA and Departamento de Física, Universidad de Santiago de Chile (USACH), Santiago 9170124, Chile
  • 10Instituto de Nanociencia y Materiales de Aragón (INMA), Universidad de Zaragoza, 50018, Zaragoza, Spain

  • *surender76@gmail.com

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Issue

Vol. 16, Iss. 2 — August 2021

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