Nonlinear nano-scale localized breather modes in a discrete weak ferromagnetic spin lattice
Author
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Kavitha, L.
Author
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Parasuraman, E.
Author
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Gopi, D.
Author
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Prabhu, A.
Author
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Vicencio Poblete, Rodrigo
Admission date
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2016-01-19T19:27:19Z
Available date
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2016-01-19T19:27:19Z
Publication date
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2016
Cita de ítem
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Journal of Magnetism and Magnetic Materials 401 (2016) 394–405
en_US
Identifier
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DOI: 10.1016/j.jmmm.2015.10.021
Identifier
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https://repositorio.uchile.cl/handle/2250/136607
General note
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Artículo de publicación ISI
en_US
Abstract
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We investigate the propagation dynamics of highly localized discrete breather modes in a weak ferromagnetic spin lattice with on-site easy axis anisotropy due to crystal field effect. We derive the discrete nonlinear equation of motion by employing boson mappings and p-representation. We explore the onset of modulational instability both analytically in the framework of linear stability analysis and numerically by means of molecular dynamics (MD) simulations, and a perfect agreement was demonstrated. It is also explored that how the antisymmetric nature of the canted ferromagnetic lattice supports highly localized discrete breather (DBs) modes as shown in the stability/instability windows. The energy exchange between low amplitude discrete breathers favours the growth of higher amplitude DBs, resulting eventually in the formation of few long-lived high amplitude DBs.