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Mar 20 – 23, 2023
Campus Garching
Europe/Berlin timezone

Magnetic order in skyrmion-hosting magnetic multilayers probed by small-angle neutron scattering and polarized neutron reflectometry

Mar 20, 2023, 3:20 PM
SCC/0-002 - Taurus 1&2 (Galileo)

SCC/0-002 - Taurus 1&2


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Talk (17 + 3 min) Magnetism, Superconductivity, Topological Systems, Magnetic Thin Films an other electronic phenomena Magnetic Thin Films & Nano


Victor Ukleev (Helmholtz-Zentrum Berlin für Materialien und Energie)


Magnetic multilayers (MMLs) composed of alternating ferromagnetic / heavy-metal layers are one of the most technologically promising classes of skyrmion-hosting systems due to number of their advantages, such as skyrmion stability at room temperature and their tunability via layer engineering [1]. Through the combination of broken inversion symmetry and spin-orbit-coupling at the asymmetric interfaces, Dzyaloshinskii-Moriya interaction (DMI) is induced that leads to stabilization of Néel-type skyrmions in finite magnetic fields [1]. In this study we utilized small-angle neutron scattering (SANS) and polarized neutron reflectometry (PNR) methods to probe the magnetic order in [Pt/CoFeB/Ru]$_N$ ($N$=10 and 40 repetitions) MMLs with bulk and layer-resolved sensitivities, respectively. Neutron scattering experiments with polarisation analysis are needed to clarify the relation between Néel (DMI-induced) and Bloch (dipolar-induced) domain walls, that seem to be inaccessible in relatively thick samples (hundreds of nm) by any other experimental technique [2]. Here, long-periodic magnetic stripe domains and orientationally disordered skyrmion phases were unambiguously observed by SANS and off-specular reflectivity. Furthermore, by using the parameters deduced from quantitative modelling of the PNR, we were be able to refine the Hamiltonian parameters used for micromagnetic models.
[1] A. Fert, N. Reyren and V. Cros, Nat. Rev. Mater. 2, 17031 (2017)
[2] W. Legrand, et al. Science Advances 4.7, eaat0415 (2018)

Primary author

Victor Ukleev (Helmholtz-Zentrum Berlin für Materialien und Energie)


Dr Anton Devishvili (Institut Laue-Langevin) Dr Fernando Ajejas (CNRS/Thales) Jonathan White (Paul Scherrer Institute) Dr Nicolas Reyren (CNRS/Thales) Robert Cubitt (Institut Laue-Langevin) Prof. Vincent Cros (CNRS/Thales)

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