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Title: Binding a hopfion in a chiral magnet nanodisk

Abstract

Hopfions are three-dimensional (3D) topological textures characterized by the integer Hopf invariant QH . Here 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 QH show that the hopfion has QH = 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:
; ;
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) (SC-22)
OSTI Identifier:
1566681
DOE Contract Number:  
SC0012670; SC0016424
Resource Type:
Journal Article
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:
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. doi:10.1103/physrevb.98.174437.
Liu, Yizhou, Lake, Roger K., and Zang, Jiadong. Thu . "Binding a hopfion in a chiral magnet nanodisk". United States. doi:10.1103/physrevb.98.174437.
@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 QH . Here 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 QH show that the hopfion has QH = 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},
issn = {2469-9950},
number = 17,
volume = 98,
place = {United States},
year = {2018},
month = {11}
}

Works referenced in this record:

Spontaneous skyrmion ground states in magnetic metals
journal, August 2006

  • Rößler, U. K.; Bogdanov, A. N.; Pfleiderer, C.
  • Nature, Vol. 442, Issue 7104, p. 797-801
  • DOI: 10.1038/nature05056