Binding a hopfion in a chiral magnet nanodisk
Abstract
Hopfions are three-dimensional (3D) topological textures characterized by the integer Hopf invariant $$Q_H$$. In this article, we present the realization of a zero-field, stable hopfion spin texture in a magnetic system consisting of a chiral magnet nanodisk sandwiched by two films with perpendicular magnetic anisotropy. The preimages of the spin texture and numerical calculations of $$Q_H$$ show that the hopfion has $$Q_H$$ = 1. Furthermore, another nontrivial state that includes a monopole-antimonopole pair (MAP) is also stabilized in this system. By applying an external magnetic field, hopfion and MAP states with the same polarization can be switched between each other. The topological transition between the hopfion and the MAP state involves a creation (annihilation) of the MAP and twist of the preimages. Our work paves the way to study nontrivial 3D topological spin textures and stimulates more investigations in the field of 3D spintronics.
- Authors:
-
- Univ. of California, Riverside, CA (United States); Chinese Academy of Sciences (CAS), Beijing (China)
- Univ. of California, Riverside, CA (United States)
- Univ. of New Hampshire, Durham, NH (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States); Univ. of New Hampshire, Durham, NH (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1566681
- Alternate Identifier(s):
- OSTI ID: 1483724
- Grant/Contract Number:
- SC0012670; SC0016424
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 17; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics
Citation Formats
Liu, Yizhou, Lake, Roger K., and Zang, Jiadong. Binding a hopfion in a chiral magnet nanodisk. United States: N. p., 2018.
Web. doi:10.1103/physrevb.98.174437.
Liu, Yizhou, Lake, Roger K., & Zang, Jiadong. Binding a hopfion in a chiral magnet nanodisk. United States. https://doi.org/10.1103/physrevb.98.174437
Liu, Yizhou, Lake, Roger K., and Zang, Jiadong. Thu .
"Binding a hopfion in a chiral magnet nanodisk". United States. https://doi.org/10.1103/physrevb.98.174437. https://www.osti.gov/servlets/purl/1566681.
@article{osti_1566681,
title = {Binding a hopfion in a chiral magnet nanodisk},
author = {Liu, Yizhou and Lake, Roger K. and Zang, Jiadong},
abstractNote = {Hopfions are three-dimensional (3D) topological textures characterized by the integer Hopf invariant $Q_H$. In this article, we present the realization of a zero-field, stable hopfion spin texture in a magnetic system consisting of a chiral magnet nanodisk sandwiched by two films with perpendicular magnetic anisotropy. The preimages of the spin texture and numerical calculations of $Q_H$ show that the hopfion has $Q_H$ = 1. Furthermore, another nontrivial state that includes a monopole-antimonopole pair (MAP) is also stabilized in this system. By applying an external magnetic field, hopfion and MAP states with the same polarization can be switched between each other. The topological transition between the hopfion and the MAP state involves a creation (annihilation) of the MAP and twist of the preimages. Our work paves the way to study nontrivial 3D topological spin textures and stimulates more investigations in the field of 3D spintronics.},
doi = {10.1103/physrevb.98.174437},
journal = {Physical Review B},
number = 17,
volume = 98,
place = {United States},
year = {Thu Nov 01 00:00:00 EDT 2018},
month = {Thu Nov 01 00:00:00 EDT 2018}
}
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