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Type: Artigo de periódico
Title: Magnetic Reconfiguration Of Mnasgaas (001) Observed By Magnetic Force Microscopy And Resonant Soft X-ray Scattering
Author: Coelho L.N.
Neves B.R.A.
Magalhaes-Paniago R.
Vicentin F.C.
Westfahl Jr. H.
Fernandes R.M.
Iikawa F.
Daweritz L.
Spezzani C.
Sacchi M.
Abstract: We investigated the thermal evolution of the magnetic properties of MnAs epitaxial films grown on GaAs(001) during the coexistence of hexagonal/orthorhombic phases using polarized resonant (magnetic) soft x-ray scattering and magnetic force microscopy. The results of the diffuse satellite x-ray peaks were compared to those obtained by magnetic force microscopy and suggest a reorientation of ferromagnetic terraces as temperature rises. By measuring hysteresis loops at these peaks we show that this reorientation is common to all ferromagnetic terraces. The reorientation is explained by a simple model based on the shape anisotropy energy. Demagnetizing factors were calculated for different configurations suggested by the magnetic images. We noted that the magnetic moments flip from an in-plane monodomain orientation at lower temperatures to a three-domain out-of-plane configuration at higher temperatures. The transition was observed when the ferromagnetic stripe width L is equal to 2.9 times the film thickness d. This is in good agreement with the expected theoretical value of L=2.6d. © 2006 American Institute of Physics.
Rights: aberto
Identifier DOI: 10.1063/1.2356794
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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