| Texto completo | |
| Autor(es): |
Arzuza, Luis C. C.
[1, 2]
;
Vega, Victor
[3]
;
Prida, Victor M.
[3]
;
Moura, Karoline O.
[2]
;
Pirota, Kleber R.
[1]
;
Beron, Fanny
[1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas UNICAMP, Phys Inst Gleb Wataghin, BR-13083859 Campinas - Brazil
[2] Univ Fed Paraiba UFPB, Phys Dept, BR-58051900 Joao Pessoa, Paraiba - Brazil
[3] Univ Oviedo, Phys Dept, Oviedo 33007 - Spain
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | NANOMATERIALS; v. 11, n. 12 DEC 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
Geometrically modulated magnetic nanowires are a simple yet efficient strategy to modify the magnetic domain wall propagation since a simple diameter modulation can achieve its pinning during the nanowire magnetization reversal. However, in dense systems of parallel nanowires, the stray fields arising at the diameter interface can interfere with the domain wall propagation in the neighboring nanowires. Therefore, the magnetic behavior of diameter-modulated nanowire arrays can be quite complex and depending on both short and long-range interaction fields, as well as the nanowire geometric dimensions. We applied the first-order reversal curve (FORC) method to bi-segmented Ni nanowire arrays varying the wide segment (45-65 nm diameter, 2.5-10.0 mu m length). The FORC results indicate a magnetic behavior modification depending on its length/diameter aspect ratio. The distributions either exhibit a strong extension along the coercivity axis or a main distribution finishing by a fork feature, whereas the extension greatly reduces in amplitude. With the help of micromagnetic simulations, we propose that a low aspect ratio stabilizes pinned domain walls at the diameter modulation during the magnetization reversal. In this case, long-range axial interaction fields nucleate a domain wall at the nanowire extremities, while short-range ones could induce a nucleation at the diameter interface. However, regardless of the wide segment aspect ratio, the magnetization reversal is governed by the local radial stray fields of the modulation near null magnetization. Our findings demonstrate the capacity of distinguishing between complex magnetic behaviors involving convoluted interaction fields. (AU) | |
| Processo FAPESP: | 17/10581-1 - Fenômenos emergentes em sistemas de dimensões reduzidas |
| Beneficiário: | Pascoal Jose Giglio Pagliuso |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |
| Processo FAPESP: | 20/07397-7 - Controle e imageamento de texturas skirmiônicas interfaciais padronizadas em sistemas multicamadas com anisotropia magnética perpendicular |
| Beneficiário: | Fanny Béron |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |