Regular and in-plane skyrmions and antiskyrmions from boundary instabilities

Sandhoefner, Shane; Raeliarijaona, Aldo; Nepal, Rabindra; Snyder-Tinoco, Dalton; Kovalev, Alexey A.

doi:10.1103/physrevb.104.064417

Regular and in-plane skyrmions and antiskyrmions from boundary instabilities

Journal Article · Mon Aug 09 00:00:00 EDT 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.104.064417· OSTI ID:1812377

Sandhoefner, Shane ^[1]; Raeliarijaona, Aldo ^[2]; Nepal, Rabindra ^[2]; ^[3]; Kovalev, Alexey A. ^[2]

Univ. of Nebraska, Lincoln, NE (United States); University of Nebraska - Lincoln
Univ. of Nebraska, Lincoln, NE (United States)
California State Univ. at San Bernardino, CA (United States)

We formulate a theory of skyrmion and antiskyrmion generation using magnetic field and charge current pulses. We show that the topological defect can be created at an edge of a system with Dzyaloshinskii-Moriya interaction (DMI) as well as at a boundary between regions with different DMI. We consider both perpendicular and in-plane (also known as magnetic bimerons) versions of skyrmions and antiskyrmions. We show that the magnetization twist in the vicinity of an edge or a boundary is described by a kink solution, the presence of which can instigate the generation of topological defects. We study the collective excitations of magnetization analytically and numerically, and demonstrate that under application of magnetic field and charge current pulses the magnon modes localized near boundaries can develop instabilities leading to the formation of skyrmions or antiskyrmions. As a result, due to the skyrmion and antiskyrmion Hall effects, a properly chosen current direction can push the topological defects away from the boundary, thus facilitating their generation.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Nebraska, Lincoln, NE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0021019

OSTI ID:: 1812377

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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