Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 43: Skyrmions III / Non-Skyrmionic Magnetic Textures II
MA 43.6: Talk
Friday, March 21, 2025, 10:45–11:00, H16
Confinement-Induced Magnetoresistances in Skyrmion-based Magnetic Tunnel Junctions — •Moritz Winterott1,2 and Samir Lounis1,2 — 1Peter Grünberg Institut, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany — 2Faculty of Physics, University of Duisburg-Essen and CENIDE, 47053 Duisburg, Germany
Innovations are essential to address the rapidly growing demand for data. One of the most promising solution are magnetic tunnel junctions [1] (MTJs) which utilize spin-dependent tunnelling between two ferromagnetic layers separated by an insulating barrier and present a high-speed, non-volatile, and energy-efficient memory solution. Combining MTJs with skyrmions offers great potential [2] due to the nanoscale size and topological protection of the later ones. However creation and efficient electrical detection of skyrmions in MTJs remains challenging. We demonstrate that a strong splitting of spin-channels leads to confined states inside the skyrmion, complementary to Friedel oscillations reaching far outside the skyrmion. These non-trivial signatures in the electronic structure induce new magnetoresistances augmenting the efficiency of those enabled by spin-orbit coupling and magnetic non-collinearity [3], which could facilitate electrical detection of skyrmions in MTJs. We employ a tight-binding scheme to explore the impact of the skyrmion size, Fermi energy and splitting of the spin-channels.
– [1] Parkin et al., Nat. Mater. 3, 862 (2004); [2] Chen et al., Nature 627, 522-527 (2024); [4] Fernandes et al., Nat. Com. 13, 1576 (2022).
Keywords: Magnetic Tunnel Junction; Noncollinearity; Skyrmions; Magnetoresistances