Artículos de revistas
Domain Wall Propagation Tuning In Magnetic Nanowires Through Geometric Modulation
Registro en:
Journal Of Magnetism And Magnetic Materials. Elsevier Science Bv, v. 432, p. 309 - 317, 2017.
0304-8853
1873-4766
WOS:000399601600046
10.1016/j.jmmm.2017.01.071
Autor
Arzuza
L. C. C.; Lopez-Ruiz
R.; Salazar-Aravena
D.; Knobel
M.; Beron
F.; Pirota
K. R.
Institución
Resumen
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) 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. (C) 2017 Elsevier B.V. All rights reserved. 432 309 317 FAPESP CNPq CAPES Chilean CONICYT 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)