Marcin Zając
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View article: Freezing and unfreezing of antiferromagnetic spins in CoO(111) epitaxial films on a ferromagnetic support
Freezing and unfreezing of antiferromagnetic spins in CoO(111) epitaxial films on a ferromagnetic support Open
Epitaxial CoO(111)/Fe(110) bilayers grown on W(110) single crystal were studied using magneto-optic Kerr effect and X-ray magnetic linear dichroism techniques. A variety of possible configurations of frozen antiferromagnetic spins and in-p…
View article: Control of non-volatile magnetic properties of Fe/CoO grown on a piezoelectric substrate
Control of non-volatile magnetic properties of Fe/CoO grown on a piezoelectric substrate Open
In this study, we investigate the piezoelectric modulation of magnetic properties in an Fe/CoO bilayer grown on a Cr-buffered PMN-PT(001) substrate. An initial application of an electric field across the substrate has induced a non-volatil…
View article: P-type conductivity in GaN:Be epitaxial layers
P-type conductivity in GaN:Be epitaxial layers Open
Electron transport properties of Be-doped heteroepitaxial GaN layers grown by metalorganic vapor phase epitaxy were investigated by means of temperature-dependent Hall effect measurements. The Be concentration was in the range of 4 × 1018−…
View article: Local structure modification around Si atoms in Si-implanted monocrystalline β-Ga2O3 (100) under heated substrate conditions
Local structure modification around Si atoms in Si-implanted monocrystalline β-Ga2O3 (100) under heated substrate conditions Open
Doping of β-Ga2O3 (100) with Si by ion implantation onto heated substrates is investigated. The study reveals complex ion beam-induced defect processes in β-Ga2O3, characterized by the formation of various defect types and their temperatur…
View article: Development of Semi-Insulating gallium nitride layers on native substrates by magnesium ion implantation and Ultra-High-Pressure annealing
Development of Semi-Insulating gallium nitride layers on native substrates by magnesium ion implantation and Ultra-High-Pressure annealing Open
In the presented research, we explore the possibility of modifying the electrical properties of ammonothermal gallium nitride substrates through ion implantation of magnesium and ultra-high-pressure annealing (UHPA). The goal is to achieve…
View article: Interfacial chemistry meets magnetism: comparison of $Co/Fe_3O_4$ and $Co/α-Fe_2O_3$ epitaxial heterostructures
Interfacial chemistry meets magnetism: comparison of $Co/Fe_3O_4$ and $Co/α-Fe_2O_3$ epitaxial heterostructures Open
The magnetic and chemical structure of metal/oxide interfaces were studied in cobalt/magnetite, $Fe_3O_4$, and cobalt/hematite, $α-Fe_2O_3$, epitaxial heterostructures using the comprehensive selection of microscopic and spectroscopic meth…
View article: Investigation of the phase transition to the Ruddlesden–Popper phase in La- or Nb-doped Sr <sub>2</sub> Fe <sub>1.5</sub> Mo <sub>0.5</sub> O <sub> 6− <i>δ</i> </sub> double perovskites and the impact of lanthanum or niobium doping
Investigation of the phase transition to the Ruddlesden–Popper phase in La- or Nb-doped Sr <sub>2</sub> Fe <sub>1.5</sub> Mo <sub>0.5</sub> O <sub> 6− <i>δ</i> </sub> double perovskites and the impact of lanthanum or niobium doping Open
The influence of La- or Nb-doping was studied for the phase transition of Sr 2 Fe 1.5 Mo 0.5 O 6−δ . Niobium does not have a positive impact on the stability and properties, while La enhances the electrical conductivity and stability of do…
View article: Correction: Investigation of the phase transition to the Ruddlesden–Popper phase in La- or Nb-doped Sr<sub>2</sub>Fe<sub>1.5</sub>Mo<sub>0.5</sub>O<sub>6−<i>δ</i></sub> double perovskites and the impact of lanthanum or niobium doping
Correction: Investigation of the phase transition to the Ruddlesden–Popper phase in La- or Nb-doped Sr<sub>2</sub>Fe<sub>1.5</sub>Mo<sub>0.5</sub>O<sub>6−<i>δ</i></sub> double perovskites and the impact of lanthanum or niobium doping Open
Correction for ‘Investigation of the phase transition to the Ruddlesden–Popper phase in La- or Nb-doped Sr 2 Fe 1.5 Mo 0.5 O 6− δ double perovskites and the impact of lanthanum or niobium doping’ by Agata Ducka et al. , Nanoscale , 2025, 1…
View article: Limited dissolution of transition metals in the nanocrystalline cerium (IV) oxide
Limited dissolution of transition metals in the nanocrystalline cerium (IV) oxide Open
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View article: From Magnetostatics to Topology: Antiferromagnetic Vortex States in NiO‐Fe Nanostructures
From Magnetostatics to Topology: Antiferromagnetic Vortex States in NiO‐Fe Nanostructures Open
Magnetic vortices are topological spin structures frequently found in ferromagnets, yet novel to antiferromagnets. By combining experiment and theory, it is demonstrated that in a nanostructured antiferromagnetic‐ferromagnetic NiO(111)‐Fe(…
View article: CuMn1.7Fe0.3O4 – RE2O3 (RE = Y, Gd) bilayers as protective interconnect coatings for solid oxide cells
CuMn1.7Fe0.3O4 – RE2O3 (RE = Y, Gd) bilayers as protective interconnect coatings for solid oxide cells Open
Efficient replacement of materials based on critical elements such as cobalt is one of the greatest challenges facing the field of solid oxide cells. New generation materials, free of cobalt show potential to replace conventional materials…
View article: Synthesis and Properties of the Ba<sub>2</sub>PrWO<sub>6</sub> Double Perovskite
Synthesis and Properties of the Ba<sub>2</sub>PrWO<sub>6</sub> Double Perovskite Open
We report details on the synthesis and properties of barium praseodymium tungstate, Ba2PrWO6, a double perovskite that has not been synthesized before. Room-temperature (RT) powder X-ray diffraction identified the most probable space group…
View article: Imprinting of Antiferromagnetic Vortex States in NiO-Fe Nanostructures
Imprinting of Antiferromagnetic Vortex States in NiO-Fe Nanostructures Open
Magnetic vortices are topological spin structures frequently found in ferromagnets, yet novel to antiferromagnets. By combining experiment and theory, we demonstrate that in a nanostructured antiferromagnetic-ferromagnetic NiO(111)-Fe(110)…
View article: Formation of Grown-In Nitrogen Vacancies and Interstitials in Highly Mg-Doped Ammonothermal GaN
Formation of Grown-In Nitrogen Vacancies and Interstitials in Highly Mg-Doped Ammonothermal GaN Open
The formation of intrinsic point defects in the N-sublattice of semi-insulating Mg-doped GaN crystals grown by the ammonothermal method (SI AT GaN:Mg) was investigated for the first time. The grown-in defects produced by the displacement o…
View article: Impact of Synthesis Parameters upon the Electronic Structure in PVD-Deposited Cd<sub><i>x</i></sub>Zn<sub>1–<i>x</i></sub>O Composite Thin Films: An XPS-XANES Investigation
Impact of Synthesis Parameters upon the Electronic Structure in PVD-Deposited Cd<sub><i>x</i></sub>Zn<sub>1–<i>x</i></sub>O Composite Thin Films: An XPS-XANES Investigation Open
The impact of different synthesis parameters, such as thickness, postsynthesis annealing temperature, and oxygen gas flow rate, upon the electronic structure is discussed in detail in the present experimental investigation. X-ray photoelec…
View article: Enhanced Electrochemical Performance of MnCo<sub>1.5</sub>Fe<sub>0.5</sub>O<sub>4</sub>Spinel for Oxygen Evolution Reaction through Heat Treatment
Enhanced Electrochemical Performance of MnCo<sub>1.5</sub>Fe<sub>0.5</sub>O<sub>4</sub>Spinel for Oxygen Evolution Reaction through Heat Treatment Open
MnCo1.5Fe0.5O4 spinel oxide was synthesized using the sol-gel technique, followed by heat treatment at various temperatures (400, 600, 800, and 1000 °C). The prepared materials were examined as anode electrocatalysts for water-splitting sy…
View article: Competing mechanisms determine oxygen redox in doped Ni-Mn based layered oxides for Na-ion batteries
Competing mechanisms determine oxygen redox in doped Ni-Mn based layered oxides for Na-ion batteries Open
Cation doping is an effective strategy for improving the cyclability of layered oxide cathode materials through suppression of phase transitions in the high voltage region (>~4.0V). In this study we choose Mg and Sc as representative dopan…
View article: Hamiltonian stochastic Lie systems and applications
Hamiltonian stochastic Lie systems and applications Open
This paper provides a practical approach to stochastic Lie systems, i.e. stochastic differential equations whose general solutions can be written as a function depending only on a generic family of particular solutions and some constants r…
View article: Tunable interplay between exchange coupling and uniaxial magnetic anisotropy in epitaxial CoO/Au/Fe trilayers
Tunable interplay between exchange coupling and uniaxial magnetic anisotropy in epitaxial CoO/Au/Fe trilayers Open
We show that the interaction between ferromagnetic Fe(110) and antiferromagnetic CoO(111) sublayers can be mediated and precisely tuned by a nonmagnetic Au spacer. Our results prove that the thickness of the Fe and Au layers can be chosen …
View article: Deterioration of the 2G HTS tapes by the Ne+ ions irradiation (250 keV)
Deterioration of the 2G HTS tapes by the Ne+ ions irradiation (250 keV) Open
We discuss changes in properties of Gd-based high-temperature superconducting (HTS) tapes induced by 250 keV Ne+ ions irradiation. HTS tapes are used in devices operating in extreme radiation conditions with the prospect of using them in s…
View article: Memory of frozen and rotatable antiferromagnetic spins in epitaxial CoO(1 1 1)/Fe and NiO(1 1 1)/Fe bilayers
Memory of frozen and rotatable antiferromagnetic spins in epitaxial CoO(1 1 1)/Fe and NiO(1 1 1)/Fe bilayers Open
We combined X-ray magnetic linear and circular dichroism together with magnetooptic Kerr effect measurements in order to follow the magnetic properties of epitaxial CoO(1 1 1)/Fe(1 1 0) and NiO(1 1 1)/Fe(1 1 0) bilayers. We find that in bo…
View article: Evaluation of electrosynthesized reduced graphene oxide–Ni/Fe/Co-based (oxy)hydroxide catalysts towards the oxygen evolution reaction
Evaluation of electrosynthesized reduced graphene oxide–Ni/Fe/Co-based (oxy)hydroxide catalysts towards the oxygen evolution reaction Open
In this work, the specific role of the addition of graphene oxide (GO) to state-of-the-art nickel–iron (NiFe) and cobalt–nickel–iron (CoNiFe) mixed oxides/hydroxides towards the oxygen evolution reaction (OER) is investigated. Morphology, …