Structure and Magnetic Properties of Nanostructured Pd–Fe Thin Films Produced by Pulse Electrodeposition

Abstract

Nanostructured Pd-Fe thin films with varied Fe content were prepared by electrodeposition technique from organic electrolytes on Cu and brass substrates. The structure and the magnetic properties of the films were investigated prior to post-deposition annealing. The structure of the Pd 1-x Fe x thin film with x = 0.14, 0.24, and 0.52 was determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM) as a solid solution of iron in palladium face-centered cubic lattice with the (111) orientation of nanograins relatively to the substrate surface. The films with higher iron concentration, x = 0.74, 0.91, have structure of a solid solution based on the bodycentered cubic lattice. The average grain size determined by the scanning electron microscopy (SEM) for the first two alloys is 7-10 nm, and for the latter ones it is about 120 nm. The saturation magnetization of the films has linear dependence on the iron content, but coercivity has nonmonotonic dependence on x, i.e. the films with x = 0.68 show highest coercivity. The magnetic anisotropy of the samples is studied by ferromagnetic resonance (FMR) spectroscopy.

Biomimetic In Situ Self-Assembly of Metal Nanoparticles into Hierarchical 3D Mesostructures: Synthesis, Analysis, and Prospects

“…Another promising application of the proposed technique could be the synthesis of mesostructures with a given magnetic moment for medical diagnostics (MRI), targeted drug delivery to specific cells, and magnetomechanical and photothermal effects on target tissues. Adjusting the composition and properties of the Pd–Fe magnetic alloy, together with adjusting the size and shape of mesostructures, can be used as a new approach to solve these problems in competition with the known methods of using Fe 3 O 4 (magnetite) nanostructures. , In contrast to magnetite particles, the palladium-based mesostructures we obtained, along with the magnetic properties, have a new quality, namely, a powerful catalytic effect on various reactions, particularly the selective hydrogenation reaction, which can be used in medicine to expose tissue to gaseous environments containing hydrogen.…”

Superconductivity of Nanostructured Pb<SUB>7</SUB>Bi<SUB>3</SUB> Films Doped by Ce

“…The electrolyte contained ions of Pb 2+ , Bi 3+ or Pb 2+ , Bi 3+ and Ce 3+ in organic aproton-dipolar solvent. 5 The organic aproton-dipolar solvent in combination with ammonium chloride provides the complex-forming process in the electrolyte, which allows obtaining thin films of PbBi and PbBiCe alloys. The amount of Pb and Ce in the grown films was adjusted by changing the current density as well as the concentration of metal ion in the solution.…”

“…Our approach to obtaining metallic alloy layers consists of using electrolytes on the basis of complex-forming aproton-dipolar solvent, which allows us to obtain films from alloys (including intermetallic compounds ones) both in electroless process 4 and using the method of pulse electroplating. 5 The distinctive feature of thin films obtained under such conditions is their nanocrystalline structure. The main goal of the present study is the development of the PbBi electrodeposition techniques of nanocrystalline films and investigation of their superconducting properties.…”

Electrodeposition of Nanocrystalline Ni–W Coatings with Citric Acid System

“…Extensive demand from a wide spectrum of industrial applications has been the major driving force for research on corrosion resistant materials, with the development of electrochemical technology, more and more new nanomaterials are prepared, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] leading to the development of nickel-based corrosion resistant alloys such as Ni-W, Ni-Co-W, Ni-Mo and Ni-Mo-Co. [18][19][20][21] In recent years, electrodeposited tungsten (W) alloys have become an important research point due to their excellent properties and engineering applications. 22 Especially Ni-W alloy elelctro-deposition has been attracted much attention, because the electrodeposited Ni-W alloys can be applied in axletree, cylinder, and high-temperature glassy mould owing to their intense hardness, good corrosion resistance, and wear resistance.…”