Tailoring the physical properties of thin nanohole arrays grown on flat anodic aluminum oxide templates

Abstract

The introduction of voids in a magnetic thin-film alters the stray field distribution and enables the tailoring of the corresponding physical properties. Here we present a detailed study on thin magnetic nanohole arrays (NhAs) grown on top of hexagonally-ordered anodic aluminum oxide (AAO) substrates. We address the effect of AAO topography on the corresponding electrical and magneto-transport properties. Optimization of the AAO topography led to NhAs with improved resistance and magnetoresistance responses, while retaining their most important feature of enhanced coercivity. This opens new pathways for the growth of more complex structures on AAO substrates, a crucial aspect for their technological viability.

Optical properties of thin metal films with nanohole arrays on porous alumina–aluminum structures

“…1 b). 32 This may cause some diffuse reflections and broadening of spectral features. 1 c), however, the shape of holes in not perfectly cylindrical.…”

Spin Valve Devices With Synthetic-Ferrimagnet Free-Layer Displaying Enhanced Sensitivity for Nanometric Sensors

“…Also, the presence of edge oxidation can decrease the effective lateral size of the SV, also local defects and edge roughness [ Fig. 1(c)] can provide additional scattering centers for electrons leading to smaller MR values [17]. The aforementioned contributions may affect the electrical properties of the SV being more pronounced below 200 nm where the surface to volume ratio of the free-layer begins to increase [8], [17].…”

“…1(c)] can provide additional scattering centers for electrons leading to smaller MR values [17]. The aforementioned contributions may affect the electrical properties of the SV being more pronounced below 200 nm where the surface to volume ratio of the free-layer begins to increase [8], [17]. Still, using R C to calculate MR leads to a value close to the intrinsic one, except for h < 200 nm, where a considerable difference is still visible, not solely accounted by R C .…”

Temperature dependence of the training effect in electrodeposited Co/CoO nanotubes

“…The milling process was carried out using an ion-beam sputter deposition system by Commonwealth Scientific Corporation. 30 The NpATs filled with Co NTs were then left in air for several months after electrodeposition, to allow natural oxidation of the Co tops/ walls to occur. Due to the highly oxidative nature of the cobalt element, exposing the Co layer to ambient atmosphere leads to the formation of an antiferromagnetic polycrystalline CoO layer at the surface.…”