Binding a hopfion in a chiral magnet nanodisk

Liu, Yizhou; Lake, Roger K.; Zang, Jiadong

doi:10.1103/physrevb.98.174437

Title: Binding a hopfion in a chiral magnet nanodisk

Journal Article · 01 November 2018 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.98.174437 · OSTI ID:1566681

Liu, Yizhou ^[1]; Lake, Roger K. ^[2]; Zang, Jiadong ^[3]

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)

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.

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

Grant/Contract Number:: SC0012670; SC0016424

OSTI ID:: 1566681

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Generation and stability of structurally imprinted target skyrmions in magnetic multilayers Kent, Noah; Streubel, Robert; Lambert, Charles-Henri Applied Physics Letters, Vol. 115, Issue 11 https://doi.org/10.1063/1.5099991	journal	September 2019
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