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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.)

Monte Carlo simulations of magnetization state of ellipsoidal CoCu particles in disordered self-assembled arrays

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Paes, V. Z. C. ; Varalda, J. ; Schio, P. ; Matsushima, J. T. ; Pereira, E. C. ; de Oliveira, A. J. A. ; Mosca, D. H.
Total Authors: 7
Document type: Journal article
Source: Journal of Materials Research; v. 31, n. 14, p. 2058-2064, JUL 28 2016.
Web of Science Citations: 0

Monte Carlo (MC) simulations of the magnetization states of disordered self-assembled arrays of particles consisting of Co87Cu13 alloy are investigated. The assemblies of magnetic particles with ellipsoidal shapes and volumes ranging from 5 to 50 mu m(3) exhibit densities of about 3 x 10(6) particles per mm(2). Magnetization was obtained in the framework of Stoner-Wohlfarth model extended to include phenomenological contributions of second-order magnetic anisotropy and coercivity mechanism with distinct configuration of easy axes of magnetization. MC simulations for assemblies containing no more than 100 particles with negligible magnetic interaction between each other and exhibiting saturation magnetization and magnetic anisotropy constant values close to those found for cobalt in bulk are in good agreement with experimental results. We evaluate and validate our computational modeling using samples having particles with different sizes and different angular distributions of the easy axis of magnetization. A simple numerical approach with minimum of parameters was used to take into account the coercive fields of the samples. Reasonable simulation results are generated based on realistic size distributions and angular distributions of easy axis of magnetization. PACS numbers: 75.30.Gw,75.60-d,75.70-i (AU)

FAPESP's process: 12/24025-0 - Magnetic, electrical and magnetostrictive properties of multiferroic composites and dilute magnetic semiconductors oxides
Grantee:Adilson Jesus Aparecido de Oliveira
Support type: Regular Research Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC