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Nucleation and configuration of magnetic topological defects in hexagonal networks of out-of-plane anisotropy NdCo5 nanomagnets

AuthorsValdés-Bango, F. ; Vélez, María ; Martín, José Ignacio ; Alameda, J. M.
Issue Date2016
CitationIX Reunión del GEFES (2016)
AbstractSpin ice is a frustrated ferromagnet with Ising spins that possesses rather peculiar properties. An artificial spin ice is an array of nanomagnets with similar frustrated interaction, but of magnetostatic nature in origin, and so highly dependent on the lattice geometrical features, with typical lateral dimensions of hundreds of nanometers. There has been a lot of effort over the past decade to construct and understand the static and dynamic behaviour of such dipolar-coupled nanomagnet systems and hexagonal networks but mainly on magnetical materials with in-plane anisotropy (e.g. permalloy or cobalt) but few has been explored on out-of-plane anisotropic materials. In our experiment, we study this through amorphous alloy NdCo5 which exhibits an stripped out-of-plane domain behaviour, that also allows us for a direct observation of magnetic domain reversal. Sets of continuous kagome lattices were fabricated by electron-beam lithography and further magnetron sputtering deposition. To avoid edge effects and to guarantee enough number of elements lattices, the size of the array area is over 200x200 μm2. In order to study size related effects elementary width was varied in the range 0.25-3 μm and three increasing length/widht aspect ratios were studied for each case. To analyze therole of the out-of-plane anisotropy, NdCo5 layer thicknesses of 65nm and 30nm were deposited and an analogous 40nm thick Co sample was fabricated for comparison. Magnetic behaviour was characterized by Magnetic Force Microscopy and Magneto-Optical Kerr Effect and a set of micromagnetic simulations were launched to support the observations. The nucleation and configuration of topological defects will be discussed as a function of array geometry and magnetic history.
DescriptionResumen del póster presentado a la IX Reunión del GEFES (Grupo Especializado de Física del Estado Sólido) de la Real Sociedad Española de Física, celebrado en Cuenca del 13 al 15 de enero de 2016.
Appears in Collections:(CINN) Comunicaciones congresos
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