SKM 2023 – scientific programme

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MA: Fachverband Magnetismus

MA 47: Skyrmions IV

MA 47.5: Talk

Friday, March 31, 2023, 10:30–10:45, HSZ 04

Nature of magnetic Exchange interactions in Centrosymmetric Hexagonal NiMnGa — •Sunil Wilfred DSouza¹, Sanjay Singh², and Jan Minár¹ — ¹New Technologies Research Centre, University of West Bohemia, Univerzitní 8, CZ-306 14 Pilsen, Czech Republic. — ²School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University) Varanasi-221005, India.

Hexagonal NiMnGa hosts Novel magnetic biskyrmion state in which vortex-like nanometric spin textures are stable over a wide temperature range extending upto the Curie temperature making it a contender for potential applications in future high-performance spintronic devices. We present, The Heisenberg exchange couplings determined from the paramagnetic phase using the disordered local moment theory which is found to give a significantly more realistic description in comparison with the treatment of the material as a ferromagnet. Frustration caused by competing ferromagnetic and antiferromagnetic exchange couplings at the nearest-neighbor Mn-Mn interactions has been noticed in NiMnGa which is known to lead to non-collinear magnetic ordering. Total energy calculations establishes a non-collinear spin-structure which is stable at a specific Mn spin canting angle in c-plane which is resulting from the magnetocrystalline anisotropy. The Mean-Field Curie temperature determined from the exchange interactions is in good agreement with experiment.