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Spin reorientation transition and phase diagram of ultrathin ferromagnetic films

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Spin reorientation transition and phase diagram of ultrathin ferromagnetic films

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Título Spin reorientation transition and phase diagram of ultrathin ferromagnetic films
Autor Carubelli, Marianela
Billoni, Orlando Vito
Pighin, Santiago Alberto
Cannas, Sergio A.
Stariolo, Daniel Adrian
Tamarit, Francisco A.
Abstract We show results from Monte Carlo simulations of a two-dimensional Heisenberg model for ultrathin films with perpendicular anisotropy. A complete phase diagram is obtained as a function of anisotropy and temperature, spanning a wide range of behavior. We discuss our results in relation to experimental findings in different ultrathin films. We observe and characterize a line of spin reorientation transitions. This transition from out-of-plane stripe order to in-plane ferromagnetic order presents an intermediate paramagnetic gap in a finite region of parameter space, as reported in experiments. For large anisotropies, direct transitions from a low temperature stripe phase to a paramagnetic or tetragonal phase with dominant perpendicular magnetization is observed, which is also in agreement with experiments. We also show the phase diagram for a system without exchange, i.e., with pure dipolar and anisotropy interactions. It shows a similar behavior to the ferromagnetic case with antiferromagnetic instead of stripe phases at low temperatures. A spin reorientation transition is also found in this case.
Contido em Physical review. B, Condensed matter and materials physics. New York. Vol. 77, no. 13 (Apr. 2008), 134417, 9p.
Assunto Diagramas de fase
Ferromagnetismo
Filmes finos
Pontos criticos
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104519
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