Chirality coupling in topological magnetic textures with multiple magnetochiral parameters

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Chiral effects arise from asymmetry, enabling unique magnetic textures.
• Magnetochirality links magnetic ordering with chirality, creating non-trivial topological structures.

Purpose of the Study:

• To demonstrate coupled magnetochiral parameters in a 3D static texture.
• To investigate the geometric deformation of magnetic vortex strings in curved nanostructures.

Main Methods:

• Fabrication of an 80 nm asymmetric permalloy cap with a vortex ground state.
• Experimental validation of nonlocal chiral symmetry breaking.
• Analysis of the geometric deformation of the vortex string into a helix.

Main Results:

• Existence of a static 3D texture with coupled magnetic helicity and geometrical chirality.
• Experimental validation of chiral symmetry breaking leading to helical vortex string deformation (curvature 3 μm⁻¹, torsion 11 μm⁻¹).
• Demonstration of coupled chiral parameters within the same magnetic texture.

Conclusions:

• Geometric chirality of vortex strings is dictated by magnetic helicity, revealing coupled chiral parameters.
• This phenomenon is crucial for understanding complex 3D magnetic textures in curvilinear objects.
• Potential applications in spin-orbitronics and magnonics due to influenced dynamics.