Spin-reorientation transitions in one-dimensional and two-dimensional magnetic nanostructures

Abstract The magnetic anisotropy energy (MAE) of 3d transition-metal wires, stripes, and films is calculated self-consistently as a function of stripe width and film thickness. The magnetization-reorientation transitions in stripes are determined along the crossover from the mono-atomic one-dimensional chain to the two-dimensional monolayer. It is shown that the MAE oscillates as a function of stripe width and depends strongly on the considered transition metal. The reorientation transitions in Co films deposited on a highly polarizable substrate such as Pd are discussed. A local analysis of the layer-resolved MAEs provides new insights into the off-plane magnetization observed in Pd-capped Co films on Pd(111). The interfaces responsible for the stability of the off-plane easy axis are characterized microscopically. An unexpected internal magnetic structure of the Co–Pd interfaces is revealed in which the magnetic moments and spin–orbit interactions at Pd atoms play a crucial role. The nature of the reorientation transition from perpendicular to in-plane magnetization with increasing film thickness is studied by means of full-vectorial calculations. The existence of a spin-canted phase at intermediate film thickness is demonstrated. Keywords: Spin-reorientation transitionsMagnetic nanostructures Acknowledgements This work was supported by EU GROWTH project AMMARE (contract number G5RD-CT-2001-00478), by CONACyT of Mexico (grant No. 39517), and by IMP of Mexico (grant No. FIES-98-101-I). Computer resources were provided by IDRIS (CNRS, France). One of the authors (JDD) acknowledges support from CNRS (France). Notes On leave from Instituto de Física, Universidad Autónoma de San Luis Potosí, Mexico. Additional informationNotes on contributorsG.M. Pastor On leave from Instituto de Física, Universidad Autónoma de San Luis Potosí, Mexico.

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