Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.38: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Magnetic skyrmions in metallic multilayers: investigation of the three dimensional magnetic texture and spin-orbit torque engineering — •Nicolas Reyren1, William Legrand1, Davide Maccariello1, Jean-Yves Chauleau1,2, Nicolas Jaouen2, Vincent Cros1, and Albert Fert1 — 1Unité Mixte de Physique CNRS/Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France — 2Sychrotron SOLEIL, Gif-sur-Yvette, France
Magnetic multilayers made of repeated trilayers, e.g.,(Pt|Co|Ir) with thicknesses of each layer below about 1 nm, are designed to preserve a large effective Dzyaloshinskii-Moriya interaction (DMI) while increasing the total magnetic volume. In such samples, the volume increase is associated to an improved stability of the magnetic textures and, in particular, we showed that skyrmions could be stabilized at room temperature. However, in the case of numerous repetitions, typically above ten for our samples structure, the stray fields of the skyrmion core and the surrounding uniform magnetization which favour “Néel caps”, overcome the DMI and lead to non-uniform magnetization along the thickness of the skyrmion. In each individual magnetic layer, the magnetic texture corresponds to a skyrmion, but the chirality of the top and bottom layers can differ. The chirality playing a crucial role for spin-orbit torque induced motion, the samples should be carefully designed in order to improve the skyrmion velocity by taking into account the specifics of the three-dimensional magnetic texture.