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Title: Boundary twists, instabilities, and creation of skyrmions and antiskyrmions

Abstract

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.

Authors:
 [1];  [1];  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
Publication Date:
Research Org.:
Univ. of Nebraska, Lincoln, Lincoln, NE (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1487435
Alternate Identifier(s):
OSTI ID: 1487183
Grant/Contract Number:  
SC0014189
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 12; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Raeliarijaona, Aldo, Nepal, Rabindra, and Kovalev, Alexey A. Boundary twists, instabilities, and creation of skyrmions and antiskyrmions. United States: N. p., 2018. Web. doi:10.1103/PhysRevMaterials.2.124401.
Raeliarijaona, Aldo, Nepal, Rabindra, & Kovalev, Alexey A. Boundary twists, instabilities, and creation of skyrmions and antiskyrmions. United States. doi:10.1103/PhysRevMaterials.2.124401.
Raeliarijaona, Aldo, Nepal, Rabindra, and Kovalev, Alexey A. Mon . "Boundary twists, instabilities, and creation of skyrmions and antiskyrmions". United States. doi:10.1103/PhysRevMaterials.2.124401. https://www.osti.gov/servlets/purl/1487435.
@article{osti_1487435,
title = {Boundary twists, instabilities, and creation of skyrmions and antiskyrmions},
author = {Raeliarijaona, Aldo and Nepal, Rabindra and Kovalev, Alexey A.},
abstractNote = {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.},
doi = {10.1103/PhysRevMaterials.2.124401},
journal = {Physical Review Materials},
number = 12,
volume = 2,
place = {United States},
year = {2018},
month = {12}
}

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