Boundary twists, instabilities, and creation of skyrmions and antiskyrmions
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.
- Publication Date:
- Grant/Contract Number:
- SC0014189
- 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)
- Research Org:
- Univ. of Nebraska, Lincoln, Lincoln, NE (United States)
- Sponsoring Org:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
- OSTI Identifier:
- 1487435
- Alternate Identifier(s):
- OSTI ID: 1487183
Raeliarijaona, Aldo, Nepal, Rabindra, and Kovalev, Alexey A. Boundary twists, instabilities, and creation of skyrmions and antiskyrmions. United States: N. p.,
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. 2018.
"Boundary twists, instabilities, and creation of skyrmions and antiskyrmions". United States.
doi:10.1103/PhysRevMaterials.2.124401.
@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}
}
Works referenced in this record:
Spontaneous skyrmion ground states in magnetic metals
journal, August 2006
journal, August 2006
- R��ler, U. K.; Bogdanov, A. N.; Pfleiderer, C.
- Nature, Vol. 442, Issue 7104, p. 797-801