X-ray absorption fine structure and x-ray diffraction studies of crystallographic grains in nanocrystalline FePd:Cu thin films

Phys. Chem. Chem. Phys.

et al. 2017

We report the synthesis and characterization of iron-bearing sodium borosilicate glasses with an FeO content lower than 10 mol%. Using Mössbauer spectroscopy we demonstrate that Fe ions most probably have a tetrahedral oxygen environment for an iron oxide content higher than 5 mol%. Additionally, the Mössbauer results along with the X-ray diffraction studies indicate the formation of magnetite nanoclusters. The electrical conductivity of iron-containing sodium borosilicate glasses is studied over a wide temperature range. The impact of iron content on the dielectric permittivity and electrical properties is discussed. Finally, ionic conduction is identified in the high temperature region and its physical origin is explained. A similar activation energy of the dc conductivity and the activation energy of the electrical relaxation suggest that both the relaxation and conduction processes can be ascribed to the same type of entities.

Section: Mössbauer Spectroscopymentioning

confidence: 99%

The effect of Fe on the structure and electrical conductivity of sodium borosilicate glasses

Ciżman

Rysiakiewicz-Pasek

Phys. Chem. Chem. Phys.

et al. 2017

“…It is worth mentioning, that the model does not take into account the temperature dependencies of the material properties such as absorption, density, specific heat and thermal conductivity, and assumes, that between laser pulses they do not change. The peak temperature of 500 circ C was chosen basing on results of our previous investigations, [9,11,12] which showed that it is the minimum temperature required to induce a diffusion process, and to start transformation from multilayer system into ordered alloy.…”

Section: Pulsed Laser Annealingmentioning

confidence: 99%

“…To reduce the temperature of L1 0 structure formation and to induce (001) texture the FePd alloy was doped with Cu, as it was observed in our previous studies. [11,12] We present here the studies of the laser annealing effect on the structure, surface morphology, grain size and shape of FePdCu thin alloy films.…”

Section: Introductionmentioning

confidence: 99%

Determination of grain shape of laser-irradiated FePdCu thin alloy films

Perzanowski

Applied Surface Science

Zarzycki

et al. 2014

The irradiation with the 10 ns pulsed infrared Nd:YAG laser was applied to transform FePdCu multilayers into chemically ordered L1 0 phase. The X-ray diffraction methods (Θ/2Θ scan, ψ-scan, ω-scan) were used to trace the presence of L1 0 phase after laser annealing with different number of pulses. The size and shape of crystallites was determined depending on their orientation with respect to film plane. The (111) oriented crystallites of constituent metals were built as coherent domains spreading through multilayers during deposition of films. Laser annealing induced the transformation of multilayers to alloy, and the ordering of (111) oriented crystallites. Simultaneously, the (002) oriented crystallites appeared confirming the transformation to L1 0 alloy.

“…However, in case of ternary FePd:Cu alloy it is necessary to consider where copper atoms are located in the alloy structure. In our previous studies, about the local structure of the FePd:Cu alloy [35,36], it was shown that Cu atoms substitute both Fe and Pd sites. With the assumption of a random distribution of copper atoms in L1 0 structure the expressions for structure factors change to: Fig.…”

Section: Long-range Chemical Order Parametermentioning

confidence: 99%

Chemical order and crystallographic texture of FePd:Cu thin alloy films

Perzanowski

Zabila

Journal of Applied Physics

et al. 2012

FePd thin films have been recently considered as promising material for high-density magnetic storage devices. However, it is necessary to find a proper method of fabrication for the (001)-textured and chemically well-ordered alloy. In this paper, we present the detailed investigations of lattice parameters, chemical order degree, grain sizes and crystallographic texture, carried out on FePd alloys with 10 at.% of Cu addition. The initial [Cu(0.2 nm)/Fe(0.9 nm)/Pd(1.1 nm)]x5 multilayers were thermally evaporated in an ultra-high vacuum on MgO(100), Si(100), Si(111) and Si(100) covered by 100 nm thick layer of amorphous SiO2. In order to obtain homogeneous FePd:Cu alloy, the multilayers were annealed in two different ways. First, the samples were rapidly annealed in nitrogen atmosphere at 600oC for 90 seconds. Next, the long annealing in a high vacuum for 1 hour at 700oC was done. This paper focuses on quantitative investigations of the chemical order degree and crystallographic texture of ternary FePd:Cu alloys deposited on four different substrates. In order to obtain both quantities we have taken a novel approach to consider the problem of dopant atoms located in the FePd structure. The studies of the structure were done using X-Ray Diffraction (XRD) performed with synchrotron radiation and pole figures measurements. We have found that the addition of Cu changes the FePd lattice parameters and lattice distortion. We have also shown, that using different substrates it is possible to obtain a FePd:Cu alloy with different chemical order and texture. Moreover, it was observed that texture category is substrate dependent