Domain wall propagation tuning in magnetic nanowires through geometric modulation
| Autor: | R. López-Ruiz, Luis C. C. Arzuza, Marcelo Knobel, Fanny Béron, D. Salazar-Aravena, Kleber R. Pirota |
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| Přispěvatelé: | UNIVERSIDADE ESTADUAL DE CAMPINAS |
| Rok vydání: | 2017 |
| Předmět: |
de histéresis magnética
Materials science Eletrodeposição Alumina Nanowire Nanotechnology 02 engineering and technology 01 natural sciences Nanofios Condensed Matter::Materials Science Electrodeposition 0103 physical sciences Artigo original modulación 010302 applied physics Nanocables materiales magnéticos Condensed matter physics Nanowires Demagnetizing field Magnetismo 021001 nanoscience & nanotechnology Condensed Matter Physics Magnetic hysteresis Electronic Optical and Magnetic Materials Vortex Transverse plane Domain wall (magnetism) Modulation Domain (ring theory) 0210 nano-technology Alúmina |
| Zdroj: | Repositório da Produção Científica e Intelectual da Unicamp Universidade Estadual de Campinas (UNICAMP) instacron:UNICAMP REDICUC-Repositorio CUC Corporación Universidad de la Costa instacron:Corporación Universidad de la Costa |
| Popis: | Agradecimentos: This work was financially supported by the Brazilian funding agencies FAPESP, CNPq and CAPES, as well as the Chilean CONICYT. We thank the Centro Nacional de Pesquisa em Energia e Materiais (CNPEM) for the use of the microscopy facilities in the C2NANO-Brazilian Nanotechnology National Laboratory (LNNano), and the CENAPAD-SP for the use of SGI/Altix ICE and computer facilities. D. S. A. acknowledges Ms. D. Cortes-Ortuno for useful discussions Abstract: The magnetic behavior of nickel modulated nanowires embedded in porous alumina membranes is investigated. Their diameters exhibit a sharp transition between below (35 nm) and above (52 nm) the theoretical limit for transverse and vortex domain walls. Magnetic hysteresis loops and first-order reversal curves (FORCs) were measured on several ordered nanowire arrays with different wide-narrow segment lengths ratio and compared with those from homogenous nanowires. The experimental magnetic response evidences a rather complex susceptibility behavior for nanowires with modulated diameter. Micromagnetic simulations on isolated and first-neighbors arrays of nanowires show that the domain wall structure, which depends on the segment diameter, suffers a transformation while crossing the diameter modulation, but without any pinning. The experimental array magnetic behavior can be ascribed to a heterogeneous stray field induced by the diameter modulation, yielding a stronger interaction field at the wide extremity than at the narrow one. The results evidence the possibility to control the domain wall propagation and morphology by modulating the lateral aspect of the magnetic entity FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES Aberto |
| Databáze: | OpenAIRE |
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