Template Assisted Deposition of Ferromagnetic Nanostructures: from Antidot Thin Films to Multisegmented Nanowires

Abstract

The growth of nanostructured materials by means of different deposition methods employing nanoporous anodic aluminum oxide membranes as patterned templates has been widely used during last years due to the outstanding features displayed by these nanoporous templates. Here we report on the synthesis, morphology and magnetic properties exhibited by novel magnetic 1D and 2D nanostructured materials having nanowire or antidot thin films geometry, respectively, together to that of geometrically diameter modulated ferromagnetic nanowires. Their magnetic properties will be analyzed and discussed based on the different anisotropic behavior derived from their morphological and microstructural features.

Influence of nanoholes array geometrical parameters on magnetic properties of Dy–Fe antidot thin films

“…The pure element metal pieces were placed inside water cooled copper crucible and have been heated by magnetically focused electron beam, 3.1 kV for Fe (crucible1) and 4.5 kV for Dy (crucible2) and electric energy 2.7 kW (Fe) and 2.5 kW for (Dy). The evaporated target metals were deposited on the top-surface of both, the hexagonally ordered and randomly disordered nanoporous alumina membranes, which play the role as templates to obtain the thin films of antidot arrays [13,34]. The control of the film thickness was achieved by using two independent quartz crystal controllers that monitored simultaneously the deposition rates of each evaporation source.…”

Tailoring of Perpendicular Magnetic Anisotropy in Dy13Fe87 Thin Films with Hexagonal Antidot Lattice Nanostructure

“…Therefore, a wide range of applications in the field of spintronics and spin wave filtering are available by using antidots arrays. The competition between the intrinsic thin film and local shape anisotropies, together with the local effects created by the antidots arrays, generates a new scenario for tailoring the magnetic properties of the thin films by suitably tuning their geometric parameters [ 13 , 14 ]. Furthermore, antidot lattices strongly influence the magnetic properties of the hosting materials and can be used for artificially engineering the magnetic anisotropy and tuning the coercivity in thin films [ 15 ].…”

Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of Bi-Segmented FeNi Nanowires

“…Patterned templates made of nanoporous alumina membranes with hexagonally self-ordered and diameter-modulated nanopores were synthesized by a novel multistage procedure consisting in the combination of electrochemical anodization, atomic layer deposition (ALD), and pore widening steps, performed on high-purity aluminum foils as the starting substrates, in a similar way to that recently reported by Prida et al [ 39 ], which has been adapted in order to obtain wider pore diameters.…”