Interfacial Strain-Driven Large Topological Hall Effects in Supermalloy Thin Films with Noncoplanar Spin Textures

• DOI: 10.1021/acsami.4c21396
• Publication Date: 2025-01-24T14:22:12Z
• Authors: Nasiruddin Mondal; Kusampal Yadav; Dilruba Hasina; Devajyoti Mukherjee
• Keywords: Strain (injury)

Materials exhibiting topological transport properties, such as a large Hall resistivity, are crucial for next-generation spintronic devices. Here, we report resistivities in epitaxial supermalloy (NiFeMo) thin films with [100] and [111] orientations grown on single-crystal MgO (100) Al2O3 (0001) substrates, respectively. While X-ray reciprocal maps confirmed the growth of films, stress analyses revealed residual strains inducing tetragonal distortions cubic NiFeMo unit cells. Magnetic force microscopy showed presence skyrmion-like features, which may arise from strain-induced spin texturing films. Magneto-optic Kerr effect 4-fold magnetic anisotropy NiFeMo/MgO film exhibited more pronounced compared to that NiFeMo/Al2O3 film. We envisage disruption centrosymmetry possibly leads Dzyaloshinskii-Moriya (DM) interactions within spins. This gives rise textures notable effects near room temperature hitherto unobserved Theoretical simulations based DM strongly correlate experimental results corroborate The modulation topology magnetism through strain engineering provide useful direction pursuit quantum