Carlos Augusto de Moraes Iglesias
@portal.uern.br
Department of Physics
RESEARCH, TEACHING, or OTHER INTERESTS
Condensed Matter Physics
Scopus Publications
- Standing wave shift magnetoimpedance in Cu/YIG/Cu cylindrical system at microwave frequencies
C.A.M. Iglesias, S.M. Rezende, J. Xavier, J.H.R. Lima, J.D.M. de Lima, F.L.A. Machado, I.B.T. Silva, M.A. Correa, F. Bohn, J.M. Soares
Journal of Magnetism and Magnetic Materials, 2026 - Impact of interfacial coupling on the structural, magnetic, and dielectric properties of CoFe2O4/NiO nanocomposites
R.A.O. Pinto, J.C.R. Araújo, R.B. Silva, A.L.R. Souza, A. Ferreira, Y. Abbas, P.C. Albuquerque, J. Xavier, C.A.M. Iglesias, J.M. Soares, M.V.S. da Silva, M.A. Morales, M.A. Correa, E.F. Silva, F. Bohn
Journal of Physics and Chemistry of Solids, 2026 - Hybrid System of Magnetic Nanoparticles and Cashew-Gum Nanoparticles Induce Apoptosis and Tumor Necrosis in Colorectal Cancer
Vinícius B. Garcia, Cainã O. G. da Silva, Luiz H. S. Gasparotto, Carlos A. M. Iglesias, Isadora L. G. da Silva, Emily L. Oliveira, Raelle F. Gomes, Regina C. M. de Paula, Rosemayre S. Freire, Felipe Bohn, Raimundo F. de Araújo Júnior
ACS Omega, 2025
High Resolution Image Download MS PowerPoint Slide Current therapies for colorectal cancer (CRC) are often limited by drug resistance, systemic toxicity, and tumor recurrence. To address these challenges, a multifunctional nanosystem for enhanced drug delivery was developed. The system is composed of cashew gum nanoparticles (CGNPs) coloaded with oxaliplatin (OXA) and retinoic acid (RA), combined with magnetic core–shell nanoparticles (CSNPs). Following synthesis and characterization, in vitro assays in CT-26 cells showed efficient nanoparticle internalization and significant dose-dependent viability reduction, with magnetic stimulation increasing late apoptosis. In vivo studies using a murine CRC model revealed enhanced tumor necrosis, reduced anaplastic cell frequency, suppressed COX-2 expression, and altered oxidative stress markers, such as SOD and GPX-1. Although tumor volume did not differ significantly between groups, histological and molecular analyses confirmed substantial antitumor effects, particularly with RA-functionalized formulations. The data suggest magnetic stimulation improved nanoparticle uptake, while RA acted as both a cytotoxic agent and a modulator of cellular uptake and inflammation. Overall, the nanosystem promoted apoptosis, tumor necrosis, and biochemical modulation. These findings lay a promising foundation for future research to investigate the nanosystem’s biodistribution, pharmacokinetics, and synergistic effects with immunotherapeutic agents. - Giant magneto-impedance effect in amorphous CoP@Cu microstrip based device in a wide frequency range
C.A.M. Iglesias, J. D. M. de Lima, E.C. Souza, J.P. Sinnecker, E. Padrón-Hernández, S.M. Rezende, F.L.A. Machado
Journal of Magnetism and Magnetic Materials, 2024 - Theoretical limit for the initial magnetic susceptibility in collective systems of noninteracting macrospins
C.A.M. Iglesias, J.C.R. de Araújo, J. Xavier, L.M. Silva, M.S. Nunes, J.H. de Araújo, S.N. de Medeiros, C.C. Plá Cid, M.A. Morales, E.F. Silva, M. Gamino, M.A. Correa, F. Bohn
Journal of Magnetism and Magnetic Materials, 2024 - Structural and magnetic properties of Fe–Ti–O solid solution prepared by ball-milling and post annealing
J.C.R. Araújo, J. Xavier, C.A.M. Iglesias, M.Q. da Silva, D.T. França, S. Araujo-Barbosa, R.B. da Silva, M.A.V. Heringer, E. Baggio-Saitovitch, C.C. Plá Cid, M. Gamino, E.F. Silva, M.A. Morales, S.N. de Medeiros, M.A. Correa, F. Bohn
Ceramics International, 2023 - Fundamental inequalities in the Stoner-Wohlfarth model
C. A. Iglesias, J. C. R. de Araújo, E. F. Silva, M. Gamino, M. A. Correa, F. Bohn
Physical Review B, 2022
We report two fundamental inequalities in the Stoner-Wohlfarth model. Specifically, we investigate the theoretical limit for the initial magnetic susceptibility in a system described by the Stoner-Wohlfarth approach. We also find analytical solutions for the magnetization in the low-field regime and obtain the borderline value for the uniaxial anisotropy constant in such an ideal Stoner-Wohlfarth system. We go beyond and introduce a general mean-field theory for interacting Stoner-Wohlfarth-like systems, thus estimating how the initial magnetic susceptibility is affected by the dipolar and exchange interactions inside the system. By means of a simple insight from a fundamental inequality for the magnetic susceptibility of an ideal Stoner-Wohlfarth system, we show its violation is a signature of the existence of exchange interactions between nanoparticles in an interacting Stoner-Wohlfarth-like system. - CoFe2O4@BiFeO3 core/shell nanoparticles: Synthesis, characterization, and fingerprints of the spin disorder
J. Xavier, R.B. da Silva, J.C.R. Araújo, C.A.M. Iglesias, E.D. Silva Filho, J.L.C. Fonseca, J.M. Soares, P.B. Souza, C.C. Plá Cid, M. Gamino, S.N. de Medeiros, M.A. Correa, F. Bohn
Journal of Alloys and Compounds, 2022 - Magnetic nanoparticles hyperthermia in a non-adiabatic and radiating process
C. A. M. Iglesias, J. C. R. de Araújo, J. Xavier, R. L. Anders, J. M. de Araújo, R. B. da Silva, J. M. Soares, E. L. Brito, L. Streck, J. L. C. Fonseca, C. C. Plá Cid, M. Gamino, E. F. Silva, C. Chesman, M. A. Correa, S. N. de Medeiros, F. Bohn
Scientific Reports, 2021
We investigate the magnetic nanoparticles hyperthermia in a non-adiabatic and radiating process through the calorimetric method. Specifically, we propose a theoretical approach to magnetic hyperthermia from a thermodynamic point of view. To test the robustness of the approach, we perform hyperthermia experiments and analyse the thermal behavior of magnetite and magnesium ferrite magnetic nanoparticles dispersed in water submitted to an alternating magnetic field. From our findings, besides estimating the specific loss power value from a non-adiabatic and radiating process, thus enhancing the accuracy in the determination of this quantity, we provide physical meaning to a parameter found in literature that still remained not fully understood, the effective thermal conductance, and bring to light how it can be obtained from experiment. In addition, we show our approach brings a correction to the estimated experimental results for specific loss power and effective thermal conductance, thus demonstrating the importance of the heat loss rate due to the thermal radiation in magnetic hyperthermia. - Tuning structural, magnetic, electrical, and dielectric properties of MgFe2O4 synthesized by sol-gel followed by heat treatment
J.C.R. Araújo, S. Araujo-Barbosa, A.L.R. Souza, C.A.M. Iglesias, J. Xavier, P.B. Souza, C.C. Plá Cid, S. Azevedo, R.B. da Silva, M.A. Correa, S.N. de Medeiros, E.F. Silva, F. Bohn
Journal of Physics and Chemistry of Solids, 2021 - Mechano-synthesis, structural and magnetic characterization, and heat release of α-Fe nanoparticles embedded in a wüstite matrix
S.O.S. Batista, M.A. Morales, W.C. dos Santos, C.A. Iglesias, E. Baggio-Saitovitch, A.S. Carriço, F. Bohn, S.N. de Medeiros
Journal of Magnetism and Magnetic Materials, 2015
