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|Type:||Artigo de periódico|
|Title:||Quantum Nucleation Of Magnetic Bubbles In A Two-dimensional Anisotropic Heisenberg Model|
|Abstract:||The authors have studied the quantum dynamics of a two-dimensional anisotropic Heisenberg model subject to an external magnetic field. They have particularly been interested in the situation where the external field is pointing in the direction opposite to that along which the initial magnetisation is prepared. Taking the continuum limit, they have been able to estimate the decay rate of this metastable phase by quantum tunnelling at extremely low temperatures. They have shown that the decay rate is vanishingly small when |H| → 0 and increases with increasing |H|. Although the limit |H| → 0 has been treated analytically, the general dependence of the decay rate on |H| could only be studied numerically. They have also been able to establish the range of validity of their approach. © 1988 IOP Publishing Ltd.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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