Geometric tailoring of domain wall traps and diodes in ferromagnetic nanostripes

Dmytro Karakuts; Kostiantyn V. Yershov; Denis D. Sheka

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arXiv · 2610.34526

Geometric tailoring of domain wall traps and diodes in ferromagnetic nanostripes

Dmytro Karakuts·Kostiantyn V. Yershov·Denis D. Sheka

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Abstract

Geometric tailoring of magnetic responses is a central theme in modern magnetism. By employing cross-sectional geometric modulation, we investigate how geometric variations influence the dynamics of field-driven domain walls. This approach enables the realization of a domain-wall trap, achieved through a nanostripe constriction, and a domain-wall diode, realized via a wedge-shaped expansion. We demonstrate that domain walls can be efficiently pinned by cross-sectional modulation, with the depinning field exhibiting strong dependence on the cross-sectional gradient. Under weak applied fields, the domain wall undergoes localized oscillations near the pinning site; under strong fields, this pinning breaks down, reproducing the typical diode characteristics. Theoretical calculations based on a biaxial ferromagnet model and a collective-variable approach are in excellent agreement with micromagnetic simulations. Finally, we delineate the parameter regime for realistic samples in which these predicted effects are most pronounced.

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Dmytro Karakuts, Kostiantyn V. Yershov, Denis D. Sheka. 2026-10-25. Geometric tailoring of domain wall traps and diodes in ferromagnetic nanostripes. https://arxiv.org/abs/2610.34526

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