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Barturen M.,Bariloche Atomic Center | Barturen M.,National University of Cuyo | Barturen M.,CNRS Nanosciences Institute of Paris | Barturen M.,Laboratorio Internacional Franco Argentino en Nanociencias | And 14 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2015

In this work we report the appearance of a large perpendicular magnetic anisotropy (PMA) in Fe1-xGax thin films grown onto ZnSe/GaAs(001). This arising anisotropy is related to the tetragonal metastable phase in as-grown samples recently reported [M. Eddrief, Phys. Rev. B 84, 161410 (2011)PRBMDO1098-012110.1103/PhysRevB.84.161410]. By means of ferromagnetic resonance studies we measured PMA values up to ∼5×105 J/m3. PMA vanishes when the cubic structure is recovered upon annealing at 300°C. Despite the important values of the magnetoelastic constants measured via the cantilever method, the consequent magnetoelastic contribution to PMA is not enough to explain the observed anisotropy values in the distorted state. Ab initio calculations show that the chemical ordering plays a crucial role in the appearance of PMA. Through a phenomenological model we propose that an excess of next-nearest-neighbor Ga pairs (B2-like ordering) along the perpendicular direction arises as a possible source of PMA in Fe1-xGax thin films. © 2015 American Physical Society. ©2015 American Physical Society.

Di Pietro Martinez M.,National University of Cuyo | Milano J.,National University of Cuyo | Milano J.,CONICET | Milano J.,Laboratorio Internacional Franco Argentino en Nanociencias | And 5 more authors.
Journal of Physics Condensed Matter | Year: 2016

In this work, we study magnetic thin films presenting magnetic stripe patterns. A fingerprint of such domains is a linear behavior of the in-plane magnetization curves below a given saturation field. We present free energy models for the in-plane magnetization curves which permit us to extract key geometrical information about the stripe patterns, such as the maximum canted angle of the magnetization and the domain wall width. As an example, we discuss in this work magnetization curves for Fe1-xGax magnetic films which present a stripe pattern with a period of 160 nm and we found a typical maximum canted angle of and a domain wall width around 30 nm. © 2016 IOP Publishing Ltd.

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