Tailoring magnetic properties of multicomponent layered structure via current annealing in FePd thin films

Abstract

Multicomponent layered systems with tailored magnetic properties were fabricated via current annealing from homogeneous Fe67Pd33 thin films, deposited via radio frequency sputtering on Si/SiO2 substrates from composite target. To promote spontaneous nano-structuring and phase separation, selected samples were subjected to current annealing in vacuum, with a controlled oxygen pressure, using various current densities for a fixed time and, as a consequence, different phases and microstructures were obtained. In particular, the formation of magnetite in different amount was observed beside other iron oxides and metallic phases. Microstructures and magnetic properties evolution as a function of annealing current were studied and interpreted with different techniques. Moreover, the temperature profile across the film thickness was modelled and its role in the selective oxidation of iron was analysed. Results show that is possible to topologically control the phases formation across the film thickness and simultaneously tailor the magnetic properties of the system.

Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe70Pd30 Nanoparticles Obtained by the Solid-State Dewetting

“…A body-centered cubic (BCC) structure is found in both cases. This evidence indicates the formation of a supersaturated solid solution of α-(Fe,Pd) as predicted by the FePd phase diagram and previously reported in the literature [47,48]. Considering the relative intensity of the diffraction peaks, no preferential orientation is observed.…”

A comparative study of the influence of the deposition technique (electrodeposition versus sputtering) on the properties of nanostructured Fe70Pd30 films

“…Although the phase diagram predicts the occurrence of two phases, namely α-Fe + FePd, for the Fe 70 Pd 30 composition [ 26 ], the GIXRD curves only show a set of reflections shifted to lower angles with respect to pure α-Fe. This might be an indication that the sputtered films are made of a single supersaturated solid solution of α-(Fe,Pd) [ 27 ]. Moreover, the (110) peak in the curves of Figure 3 (a) is broader (larger full width at half maximum) which can be related to a non-uniform distribution of Pd into the supersaturated solid solution [ 27 ].…”

“…This might be an indication that the sputtered films are made of a single supersaturated solid solution of α-(Fe,Pd) [27]. Moreover, the (110) peak in the curves of Figure 3 (a) is broader (larger full width at half maximum) which can be related to a non-uniform distribution of Pd into the supersaturated solid solution [27]. Considering the relative intensity of the diffraction peaks, no preferential orientation is observed.…”

Structural, Wetting and Magnetic Properties of Sputtered Fe70Pd30 Thin Film with Nanostructured Surface Induced by Dealloying Process

“…The x-ray diffraction patterns of the as-deposited S50 and S200 samples are shown in Figure 1 . Discerned the substrate peaks, both patterns indicate the formation of a metastable supersaturated solid solution of α-(Fe,Pd) [ 26 , 49 ]. The slight broadening of the reflection peaks indicates overlapping of diffraction peaks at slightly different angles induced by a non-uniformly distribution of the elements in the crystalline grains [ 26 ].…”