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

Abstract

Influence of nanoholes array geometrical parameters 2 | 30 of high interest for the development of novel magnetic sensors and for thermo-magnetic recording patterned media based on template-assisted deposition techniques.

Dynamic and static properties of stadium-shaped antidot arrays

“…1). The sizes considered in our simulations are similar to some experimentally studied arrays 25,26,41,60,64,65 .…”

Dependence of the Magnetization Process on the Thickness of Fe70Pd30 Nanostructured Thin Film

“…To investigate the effects of the thermal activation on nanostructured array films and CTF samples, we measured the temperature dependence of the magnetization, M(T), in the temperature interval from 200 K to 750 K. Figure 6 plots the normalized magnetization, M(T)/M(RT), as a function of the temperature for Fe 70 Pd 30 non-patterned films and the corresponding nanostructured array films with t = 20 nm and 80 nm. We applied a high external magnetic field of around 20 kOe because of the very weak magnetic signal in the case of nanostructured samples, and followed the procedures reported in [28]. As can be seen in Figure 6, a variation in magnetic behavior was detected for antidot array samples with different antidot layer thicknesses.…”

“…The uncertainties were estimated as the standard deviation (four different points on the surface were taken for each specimen); the relatively low values of the standard deviation assured the homogeneity of the samples. The small variations in the final chemical composition of the samples were most likely due to the procedures during the film deposition to fix the deposition rate of Fe and Pd elements with its layer thickness, as reported in [28].…”

“…Selected area electron diffraction (SAED) spectra were then collected. The chemical composition of the antidots and their corresponding continuous thin films were determined via the crystal quartz control at the end of the film deposition, used to calculate the Fe:Pd ratio in the alloy [28]. To confirm the composition of the Fe-Pd alloy, subsequent analysis was performed by energy-dispersive X-ray spectroscopy (EDX, JEOL Ltd., Tokyo, Japan), as plotted in Table 1.…”

“…This observation is in line with our experimental data, as can be appreciated in Figures 3a and 4. Furthermore, an in-plane uniaxial anisotropy was observed for the continuous thin films, which could be ascribed to two different phenomena: a residual stress on the surface of the film was generated after the deposition, which is associated with the angle of incidence of the evaporation beam in the substrate, and the dispersion of the magnetic field values needed to focus the electrons used to heat the materials [28]. A magnetic anisotropy with an in-plane easy magnetization direction was obtained for the Fe70Pd30 antidot arrays (see Figure 3b).…”