Magnetic surface phase of thin helimagnetic films

• Autor(a) principal: Mello, V. D.
• Data de Publicação: 2003
• Outros Autores: Chianca, C. V., Dantas, Ana L, Carriço, Artur da Silva
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/jspui/handle/123456789/28679; https://doi.org/10.1103/PhysRevB.67.012401
• topic: Magnetic phases - Helimagnetic film

We study the magnetic phases of a thin helimagnetic film, with the c axis along the normal to the surface, in the presence of a dc external field H parallel to the c axis. For small values of H we have found a conical phase, as in the bulk, with small modifications near the surfaces. This surface modified conical phase collapses into a planar structure, the c-fan phase, when H is greater than a threshold value H*. The c-fan phase consists of a magnetic pattern in which the magnetic moments are in a plane perpendicular to the surface, containing one of the easy directions of the basal plane. We show that the c-fan phase does not form in the bulk and present results for a Dy thin film near the Ne`el temperature.