Papers by Arkadiusz Zarzycki
Materials
We describe the magnetic properties of thin iron films deposited on the nanoporous titanium oxide... more We describe the magnetic properties of thin iron films deposited on the nanoporous titanium oxide templates and analyze their dependance on nanopore radius. We then compare the results to a continuous iron film of the same thickness. Additionally, we investigate the evolution of the magnetic properties of these films after annealing. We demonstrate that the M(H) loops consist of two magnetic phases originating from the iron layer and iron oxides formed at the titanium oxide/iron interface. We perform deconvolution of hysteresis loops to extract information for each magnetic phase. Finally, we investigate the magnetic interactions between the phases and verify the presence of exchange coupling between them. We observe the altering of the magnetic properties by the nanopores as a magnetic hardening of the magnetic material. The ZFC-FC (Zero-field cooled/field cooled) measurements indicate the presence of a disordered glass state below 50 K, which can be explained by the formation of i...
Materials
In this work, the process of solid-state dewetting in FePd thin films and its influence on struct... more In this work, the process of solid-state dewetting in FePd thin films and its influence on structural transformation and magnetic properties is presented. The morphology, structure and magnetic properties of the FePd system subjected to annealing at 600 °C for different times were studied. The analysis showed a strong correlation between the dewetting process and various physical phenomena. In particular, the transition between the A1 phase and L10 phase is strongly influenced by and inextricably connected with solid-state dewetting. Major changes were observed when the film lost its continuity, including a fast growth of the L10 phase, changes in the magnetization reversal behavior or the induction of magnetic spring-like behavior.
Acta Physica Polonica A, 2018
An optical strain sensor was developed for use in stretchable electronics. It consists of a diffr... more An optical strain sensor was developed for use in stretchable electronics. It consists of a diffraction grating formed directly on the examined surface illuminated by a laser beam which creates interference pattern. This pattern can then be used to determine axial and lateral strains for a uniaxial stress states. Direct laser interference patterning was employed as a fast processing tool for the preparation of micro-and sub-microgratings. Two coherent beams of Nd:YAG laser with 532 nm wavelength and pulse duration of 10 ns were used to selectively remove material from the irradiated sample surface. This technique creates periodic pattern on the metallized surface of polymeric substrates. New sensors formed by direct laser interference patterning method were able to resolve higher order diffraction maxima, which would be of benefit for strain measurement application. Experimental setup for tensile tests was composed of laser probe, the sensor element, and CCD camera. To extract strain values, we analysed acquired interference pattern images in real time software, developed with LabVIEW environment. This kind of contactless strain sensor is suitable for examination of stretchable electronics component for which conventional tensile tests are either not acceptable or can interfere with its normal operation.
X-ray diffraction and magnetic measurements of RCuIn (R = Ce, Nd, Gd, Tb, Dy, Ho, Er) and R2CuIn3... more X-ray diffraction and magnetic measurements of RCuIn (R = Ce, Nd, Gd, Tb, Dy, Ho, Er) and R2CuIn3 (R = Ce, Gd, Tb, Dy) are reported. The RCuIn compounds crystallize in the hexagonal ZrNiAl-type structure. Two types of hexagonal structure were found in the R2CuIn3 series of compounds: the AlB2 type for R = Ce and the CaIn2 type for R = Gd, Tb, Dy. DC magnetic susceptibility measurements show that all the compounds, except those with R = Ce, order antiferromagnetically with TN ranging from 3.1 K (R = Er) to 21 K (R = Gd) in the RCuIn series and from 25.6 K (R = Dy) to 40 K for (R = Tb) in the R2CuIn3 series. Neutron diffraction measurements were carried out for TbCuIn. At 1.5 K the Tb magnetic moments lie in the basal plane and form a noncollinear magnetic structure described by the propagation vector k = (½, ½, 0.2217(9)). The frustration effect characteristic of a triangular lattice is observed.
Engineering of Biomaterials, 2016
Nanotechnology, 2017
We have studied the transition between two different magnetization reversal mechanisms for thin C... more We have studied the transition between two different magnetization reversal mechanisms for thin Co/Pd multilayers with perpendicular magnetic anisotropy, appearing in magnetic dot and antidot arrays, which were prepared by nanosphere lithography. Various ordered arrays of nanostuctures, both magnetic dots and antidots, were created by varying size and distance between the nanospheres employing RF-plasma etching. We have shown that the coercivity values reach a maximum for the array of antidots with a separation length close to the domain wall width. In this case, each area between three adjacent holes corresponds to a single domain configuration, which can be switched individually. On the contrary, small hole sizes and large volume of material between them results in domain wall propagation throughout the system accompanied by strong domain wall pinning at the holes. We have also shown the impact of edge effects on the magnetic anisotropy energy.
Proceedings of International Conference Nanomeeting 2015, 2015
Physical Review B, 2009
The gamma-gamma perturbed angular correlation technique (PAC) using R99u was applied to investiga... more The gamma-gamma perturbed angular correlation technique (PAC) using R99u was applied to investigate the orbital ordering of Ru4d electrons in Ca2RuO4 . It was confirmed that the ferro-orbital ordering characterized by the double occupation of dxy orbitals at every Ru ion is realized in the stoichiometric Ca2RuO4 . A strong temperature dependence of the quadrupole interaction below the metal-insulator transition
order and crystallographic texture of FePd:Cu thin alloy films
The Cu/Fe/Pd multilayers were transformed into L10-ordered FePdCu alloy by pulsed laser annealing... more The Cu/Fe/Pd multilayers were transformed into L10-ordered FePdCu alloy by pulsed laser annealing. The initial multilayers were irradiated with 1, 10, 100, and 1000 laser pulses with duration time of 10 ns and energy density of 235 mJ/cm2. The gradual change of the number of laser pulses allowed to investigate the structural and magnetic properties at early stages of the transformation and L10-ordering processes. The measurements were carried out using X-Ray Diffraction, SQUID magnetometry, and Magnetic Force Microscopy. We found that L10 FePdCu (111)-oriented nanograins are formed by ordering of the coherent domains present in the as-deposited multilayer. The irradiation does not change the vertical size of the (111) crystallites. The L10 (002)-oriented grains appear at the later stages of the transformation and their size increases with the number of applied laser pulses. Additionally, the laser annealing induces the magnetic ordering of the irradiated material, which was observed...
Development of modern spintronic devices requires materials exhibiting specific magnetic effects.... more Development of modern spintronic devices requires materials exhibiting specific magnetic effects. In this paper, we investigate a magnetization reversal mechanism in a [Co/Pdx]7/CoO/[Co/Pdy]7 thin-film composite where an antiferromagnet is sandwiched between a hard and a soft ferromagnets with different coercivities. The antiferromagnet/ferromagnet interfaces give rise to the exchange bias effect. The application of soft and hard ferromagnetic films causes exchange-spring-like behavior while the choice of the Co/Pd multilayers provides large out-of-plane magnetic anisotropy. We observed that the magnitude and the sign of the exchange bias anisotropy field are related to the arrangement of the magnetic moments in the antiferromagnetic layer. This ordering is induced by the spin orientation present in neighboring ferromagnetic films which is, in turn, dependent on the orientation and strength of the external magnetic field.
Materials
In this paper, we describe magnetoelectric properties of metal/metal-oxide/metal junctions based ... more In this paper, we describe magnetoelectric properties of metal/metal-oxide/metal junctions based on anodized metal oxides. Specifically, we use Ti and Fe metallic layers separated by the porous metal-oxides of iron or titanium formed by the anodization method. Thus, we prepare double junctions with at least one ferromagnetic layer and measure magnetoresistance, as well as their current-voltage and magnetic characteristics. We find that magnetoresistance depends on that junction composition and discuss the nature of differential resistance calculated from I-V characteristics. Our findings show that a top metallic layer and the interface between this layer and anodized oxide, where strong interatomic diffusion is expected, have the strongest influence on this observed behavior.
Materials, 2021
We studied the morphology, structure, and magnetic properties of Fe nanowires that were electrode... more We studied the morphology, structure, and magnetic properties of Fe nanowires that were electrodeposited as a function of the electrolyte temperature. The nucleation mechanism followed instantaneous growth. At low temperatures, we observed an increase of the total charge reduced into the templates, thus suggesting a significant increase in the degree of pore filling. Scanning electron microscopy images revealed smooth nanowires without any characteristic features that would differentiate their morphology as a function of the electrolyte temperature. X-ray photoelectron spectroscopy studies indicated the presence of a polycarbonate coating that covered the nanowires and protected them against oxidation. The X-ray diffraction measurements showed peaks coming from the polycrystalline Fe bcc structure without any traces of the oxide phases. The crystallite size decreased with an increasing electrolyte temperature. The transmission electron microscopy measurements proved the fine-crystal...
The REBa2Cu3O7-δ (where RE - rare earth element, 0 < δ < 1) superconductor (also called &qu... more The REBa2Cu3O7-δ (where RE - rare earth element, 0 < δ < 1) superconductor (also called "RE-BCO” or "1:2:3”) is produced by calcination of a mixture of copper (II) oxide (CuO), barium carbonate (BaCO3) and yttrium (III) oxide (Y2O3) powders. The aim of the research was to study similarities and differences in physico-chemical properties for ceramic samples of high-temperature superconductors slightly differing in the average crystal ionic radiuses of RE3+. For this purpose a reference sample YBa2Cu3O7-δ was prepared, for which the average crystal radius of the ion Y3+ is 104.0 pm and two samples with approximate to that average crystal ionic radiuses RE3+: HoBa2Cu3O7-δ and Er0.5Dy0.5Ba2Cu3O7-δ, where the average crystal ionic radiuses are 104.1 pm. The physicochemical properties of samples were studied and the microstructure of samples was characterized. The structural and phase homogeneity analysis was carried out using Raman spectroscopy, Scanning Electron Microsco...
The present work deals with the corrosion of mild steel (1.0037) used as the outer construction m... more The present work deals with the corrosion of mild steel (1.0037) used as the outer construction material of the preheater of a modern industrial cement production facility. The facility uses secondary fuels, which introduce considerable amounts of corrosive species. The situation at the examination sites in the preheater zone is tracked over a period of two years including operation and shut-down periods. The investigation is focused on (i) the acquisition of the underlying physicochemical conditions, such as moisture, temperature, and contamination data at the examination site of the preheater, (ii) the multianalytical identification of the formed corrosion products using scanning electron microscopy combined with energy-dispersive X-ray analysis, infrared spectrometry, Raman spectrometry, X-ray diffractometry, and Moβbauer spectrometry, and (iii) voltammetric and EIS laboratory investigations using model solutions. It was evidenced that corrosion takes place at a temperature level...
In this paper we present magnetoelectric properties of metal/metal-oxide/metal junctions. We use ... more In this paper we present magnetoelectric properties of metal/metal-oxide/metal junctions. We use Ti and Fe as metallic layers separated by the porous metal-oxides of iron or titanium formed with the anodization method. This allowed to prepare double junctions with at least one ferromagnetic layer. Here we show magnetoresistance and current-voltage characteristics of the junctions together with their magnetic characteristics. We found positive or negative magnetoresistance depending on junction composition. We discuss also the nature of differential resistance calculated from I-V characteristics. Our findings show that the strongest influence on observed behaviour has a top metallic layer and the interface between this layer and anodized oxide where strong interatomic diffusion is expected.
Coatings, 2021
In this paper we describe characterization of semi-metallic bismuth thin films. We prepared bismu... more In this paper we describe characterization of semi-metallic bismuth thin films. We prepared bismuth thin films by a deposition of bismuth through thermal evaporation onto flexible Kapton substrates and annealing at temperatures close to the melting point of Bi. We studied the morphology and transport properties of these films. Immediately after the deposition we observed competition between vanishing of the grain boundaries and elastic strain energy, which stabilized at larger thicknesses leading to the grain size of 140 nm. This effect was accompanied by a continuous decrease of resistivity which, however, was larger than for the bulk bismuth. The film annealing at temperatures close to the melting point of Bi led to a 300% increase of magnetoresistance at room temperature and in the magnetic field of 7 T. The in situ resistance measurements allowed us to determine the permissible temperature at which the annealing does not cause the loss of film continuity.
Materials, 2020
Nanotechnology is a very attractive tool for tailoring the surface of an orthopedic implant to op... more Nanotechnology is a very attractive tool for tailoring the surface of an orthopedic implant to optimize its interaction with the biological environment. Nanostructured interfaces are promising, especially for orthopedic applications. They can not only improve osseointegration between the implant and the living bone but also may be used as drug delivery platforms. The nanoporous structure can be used as a drug carrier to the surrounding tissue, with the intention to accelerate tissue–implant integration as well as to reduce and treat bacterial infections occurring after implantation. Titanium oxide nanotubes are promising for such applications; however, their brittle nature could be a significantly limiting factor. In this work, we modified the topography of commercially used titanium foil by the anodization process and hydrothermal treatment. As a result, we obtained a crystalline nanoporous u-shaped structure (US) of anodized titanium oxide with improved resistance to scratch compa...
Uploads
Papers by Arkadiusz Zarzycki