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https://locus.ufv.br//handle/123456789/23656
Tipo: | Artigo |
Título: | On coherent states and the Self-Consistent Harmonic Approximation |
Autor(es): | Moura, A. R. Lopes, R. J. C. |
Abstract: | We used the Self-Consistent Harmonic Approximation (SCHA) to study the thermodynamics of the precession magnetization in a two-dimensional isotropic ferromagnet. The SCHA treats the Hamiltonian in terms of the canonically conjugate operators Sz and φ (the azimuth angle) including renormalized temperature dependent parameters to take into account higher order interactions. It is well-known that in right conditions, a dynamic magnetic field is able to provide spin pumping and drives the system to a magnon Bose-Einstein condensation. The magnon condensate is a coherent state that presents minimal uncertainty for the Sz and φ operators. Consequently, 〈Sz〉 and 〈φ〉 should constitute natural fields to describe the model, which justifies the SCHA formalism. The results obtained are consistent with other theoretical and experimental works. |
Palavras-chave: | Ferromagnetism Coherent states Self-Consistent Harmonic Approximation Precession magnetization |
Editor: | Journal of Magnetism and Magnetic Materials |
Tipo de Acesso: | 2018 Elsevier B.V. All rights reserved. |
URI: | https://doi.org/10.1016/j.jmmm.2018.09.122 http://www.locus.ufv.br/handle/123456789/23656 |
Data do documento: | 15-Fev-2019 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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artigo.pdf Until 2100-12-31 | Texto completo | 717,1 kB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
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