Boundary twists, instabilities, and creation of skyrmions and antiskyrmions

Raeliarijaona, Aldo; Nepal, Rabindra; Kovalev, Alexey A.

doi:10.1103/PhysRevMaterials.2.124401

Boundary twists, instabilities, and creation of skyrmions and antiskyrmions

Journal Article · Mon Dec 17 00:00:00 EST 2018 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.2.124401· OSTI ID:1487435

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

Univ. of Nebraska, Lincoln, NE (United States); University of Nebraska - Lincoln
Univ. of Nebraska, Lincoln, NE (United States)

We formulate and study the general boundary conditions dictating the magnetization profile in the vicinity of an interface between magnets with dissimilar properties. We show that in general case the boundary conditions lead to the magnetization profile corresponding to the Néel, Bloch, or intermediate twist. We explore how such twists can be utilized for creation of skyrmions and antiskyrmions, e.g., in a view of magnetic memory applications. To this end, we study various scenarios of how skyrmions and antiskyrmions can be created from interface magnetization twists due to local instabilities. We also show that a judicious choice of Dzyaloshinskii-Moriya tensor (hence a carefully designed material) can lead to local instabilities generating certain types of skyrmions or antiskyrmions. The local instabilities are shown to appear in solutions of the Bogoliubov-de-Gennes equations describing ellipticity of magnon modes bound to interfaces. In one considered scenario, a skyrmion-antiskyrmion pair can be created due to instabilities at an interface between materials with properly engineered Dzyaloshinskii-Moriya interactions. Furthermore, we use micromagnetics simulations to confirm our analytical predictions.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0014189

OSTI ID:: 1487435

Alternate ID(s):: OSTI ID: 1487183

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 12 Vol. 2; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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