"Boundary conditions and Berry phase in magnetic nanostructures" by A. Ullah, B. Balamurugan et al.

Materials and Nanoscience, Nebraska Center for (NCMN)

 

Date of this Version

2019

Citation

AIP Advances 9, 125049 (2019)

Comments

© Author(s) 2019

Open access

doi: 10.1063/1.5130477

Abstract

The effect of micromagnetic boundary conditions on the Berry curvature and topological Hall effect in granular nanostructures is investi- gated by model calculations. Both free surfaces and grain boundaries between interacting particles or grains affect the spin structure. The Dzyaloshinskii-Moriya interactions yield corrections to the Erdmann-Weierstrass boundary conditions, but the Berry curvature remains an exclusive functional of the local spin structure, which greatly simplifies the treatment of nanostructures. An explicit example is a model nanostructure with cylindrical symmetry whose spin structure is described by Bessel function and which yields a mean-field-type Hall-effect contribution that can be related to magnetic-force-microscopy images.

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