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Corona RM, Saavedra E, Castillo-Sepulveda S, Escrig J, Altbir D, Carvalho-Santos VL. Curvature-induced stabilization and field-driven dynamics of magnetic hopfions in toroidal nanorings. NANOTECHNOLOGY 2023; 34:165702. [PMID: 36689765 DOI: 10.1088/1361-6528/acb557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 01/23/2023] [Indexed: 06/17/2023]
Abstract
Three dimensional magnetic textures are a cornerstone in magnetism research. In this work, we analyze the stabilization and dynamic response of a magnetic hopfion hosted in a toroidal nanoring with intrinsic Dzyaloshinskii-Moriya interaction simulating FeGe. Our results evidence that unlike their planar counterparts, where perpendicular magnetic anisotropies are necessary to stabilize hopfions, the shape anisotropy originated on the torus symmetry naturally yields the nucleation of these topological textures. We also analyze the magnetization dynamical response by applying a magnetic field pulse to differentiate among several magnetic patterns. Finally, to understand the nature of spin wave modes, we analyze the spatial distributions of the resonant mode amplitudes and phases and describe the differences among bulk and surface modes. Importantly, hopfions lying in toroidal nanorings present a non-circularly symmetric poloidal resonant mode, which is not observed in other systems hosting hopfions.
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Affiliation(s)
- R M Corona
- Universidad de Santiago de Chile, Departamento de Física, Avda. Víctor Jara 3493, 9170124 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Avda. Libertador Bernardo O'Higgins 3363, 9170124 Santiago, Chile
| | - E Saavedra
- Universidad de Santiago de Chile, Departamento de Física, Avda. Víctor Jara 3493, 9170124 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Avda. Libertador Bernardo O'Higgins 3363, 9170124 Santiago, Chile
| | - S Castillo-Sepulveda
- Departamento de Ingeniería, Universidad Autónoma de Chile, Avda. Pedro de Valdivia 425, Providencia, Chile
| | - J Escrig
- Universidad de Santiago de Chile, Departamento de Física, Avda. Víctor Jara 3493, 9170124 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Avda. Libertador Bernardo O'Higgins 3363, 9170124 Santiago, Chile
| | - D Altbir
- Universidad de Santiago de Chile, Departamento de Física, Avda. Víctor Jara 3493, 9170124 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Avda. Libertador Bernardo O'Higgins 3363, 9170124 Santiago, Chile
| | - V L Carvalho-Santos
- Universidade Federal de Viçosa, Departamento de Física, Avenida Peter Henry Rolfs s/n, 36570-000, Viçosa, MG, Brasil
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