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

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 µm3 exhibit densities of about 3 × 106 particles per...

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Bibliographic Details
Published in:Journal of materials research 2016-07, Vol.31 (14), p.2058-2064
Main Authors: Paes, V.Z.C., Varalda, J., Schio, P., Matsushima, J.T., Pereira, E.C., de Oliveira, A.J.A., Mosca, D.H.
Format: Article
Language:English
Subjects:
Alloys
Analysis
Angular distribution
Anisotropy
Applied and Technical Physics
Arrays
Biomaterials
Coercive force
Computer simulation
Inorganic Chemistry
Magnetic anisotropy
Magnetic fields
Magnetism
Magnetization
Materials Engineering
Materials research
Materials Science
Mathematical models
Monte Carlo methods
Monte Carlo simulation
Morphology
Nanotechnology
Scanning electron microscopy
Simulation
Studies
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Summary: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 µm3 exhibit densities of about 3 × 106 particles per mm2. 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
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2016.173