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MA: Fachverband Magnetismus

MA 41: Poster III

MA 41.37: Poster

Donnerstag, 20. März 2025, 15:00–17:30, P3

Exploring Topological Magnetism in Magnet-Superconductor Hybrid Systems — •Sayan Banik¹ and Ashis Nandy² — ¹National Institute of Science Education and Research, Jatni 752050, India — ²National Institute of Science Education and Research, Jatni 752050, India

In this study, we engineer magnet-superconductor hybrids (MSHs) by placing 3d transition metals (TM) on the surface of the s-wave superconductor (SC), Nb. By employing a systematic search approach, we select a few members within this MSH family that exhibit magnetism according to Hund's first rule, depending on two different superconducting surfaces. Interestingly, the weak spin-orbit coupling at these interfaces causes the magnetic behavior to differ from what Hund's rule predicts.

By employing detailed ab initio electronic structure calculations followed by spin-lattice simulations, we further explored these materials, discovering many complex and unusual spin textures. For example, Cr/Nb(110) and Mn/Nb(110) are found to exhibit antiferromagnetic spin spiral (AFM-SS) ground states. In contrast, Fe/Nb(001) exhibits antiferromagnetic (AFM) order, while Cr/Nb(001) displays a magnetic state with an AFM chain along the x-direction and a spin spiral modulation along the y-direction. The strain affects these magnetic ground states, finding that the AFM-SS of Mn/Nb(110) changes to AFM order when in-plane strain is applied.

We find a hexagonal skyrmion lattice by covering the top surface of the TM-SC with two layers of heavy metal.

Keywords: Magnet-superconductor hybrids; Spin-orbit coupling; Antiferromagnetic spin-spirals; Skyrmion lattice; Topological superconducting phases