Boundary conditions and Berry phase in magnetic nanostructures

A. Ullah, B. Balamurugan, W. Zhang, D. J. Sellmyer, R. Skomski

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of micromagnetic boundary conditions on the Berry curvature and topological Hall effect in granular nanostructures is investigated 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.

Original languageEnglish (US)
Article number125049
JournalAIP Advances
Volume9
Issue number12
DOIs
StatePublished - Dec 1 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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