A5034259877- Magnetic properties of thin films
- Magnetic Properties and Applications
- Crystallography and Radiation Phenomena
- Theoretical and Computational Physics
- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Magnetic Properties and Synthesis of Ferrites
- Iron oxide chemistry and applications
- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Microstructure and mechanical properties
- Nuclear materials and radiation effects
- Advanced X-ray Imaging Techniques
- Fusion materials and technologies
- Surface and Thin Film Phenomena
- Characterization and Applications of Magnetic Nanoparticles
- Magneto-Optical Properties and Applications
- Magnetic Properties of Alloys
- Advanced Condensed Matter Physics
- High-pressure geophysics and materials
- X-ray Diffraction in Crystallography
- Heusler alloys: electronic and magnetic properties
- Photosynthetic Processes and Mechanisms
- Advanced Chemical Physics Studies
- Metal and Thin Film Mechanics
AGH University of Krakow
2015-2024
Jagiellonian University
2023-2024
Krakow Cardiovascular Research Institute
2020
Karlsruhe Institute of Technology
2013
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences
2004-2010
Institute of Metallurgy and Materials Science
1997-2004
Polish Academy of Sciences
2004
Abstract The SOLARIS synchrotron located in Krakow, Poland, is a third-generation light source operating at medium electron energy. first was observed 2015, and the consequent development of infrastructure lead to users’ experiments soft X-ray energies 2018. Presently, expands its operation towards hard X-rays with continuous developments beamlines concurrent infrastructure. In following, we will summarize design, describe research together main performance parameters, upgrade, plans.
The confinement of materials in low-dimensional structures has significant impact on propagating excitations like phonons. Using the isotope-specific 57Fe nuclear resonant vibrational spectroscopy we were able to determine elastic and thermodynamic properties ultrathin Fe films W(110). With decreasing thickness one observes a increase mean atomic displacement that goes along with an enhancement modes at low energies as compared bulk. analysis reveals these deviations result from vibrations...
An in-plane spin-reorientation transition occurring during the growth of epitaxial Fe films on W(110) was studied in situ by using nuclear resonant scattering synchrotron radiation. The originates at Fe/W(110) interface and proceeds via a noncollinear spin structure resembling planar domain wall that propagates towards surface with increasing film thickness.
We have observed a strong (2%) angular modulation of the total backscattered conversion electron yield, measured as function incidence angle 14.4 keV $\ensuremath{\gamma}$ rays from ${}^{57}\mathrm{Co}$ M\"ossbauer source irradiating thin epitaxial ${}^{57}\mathrm{Fe}$ film grown on MgO(001). The 2D pattern is first hologram local surrounding absorbing nuclei obtained due to nuclear resonant scattering rays. real space holographic reconstruction shows distinct features corresponding nearest...
The in-plane density of phonon states clean Fe(110) surface was measured separately for the first, second, and further atomic monolayers using nuclear inelastic scattering synchrotron radiation. results show that atoms first layer vibrate with frequencies significantly lower amplitudes much larger than those in bulk, vibrational spectra along two perpendicular in-surface directions are different. vibrations second already very close to bulk. good agreement experimental first-principles...
Abstract We report on the magnetic properties of antiferromagnetic NiO(001) thin films in epitaxially grown NiO/MgO( d MgO )/Cr/MgO(001) system for different thicknesses MgO, . Results X-ray Magnetic Linear Dichroism show that together with an increase , rotation NiO spins from in-plane towards out-of-plane direction occurs. Furthermore, we investigated how proximity Fe modifies state Fe/NiO/MgO( )/Cr/MgO(001). proved existence a multidomain as result competition between...
Antiferromagnet/ferromagnet (AFM/FM) bilayers that display the exchange bias (EB) effect have been subjected to intensive material research, being key elements of novel spintronics systems. In a commonly accepted picture, antiferromagnet, considered as rigid due its high anisotropy and magnetic hardness, controls properties ferromagnet, such shift hysteresis loop or coercivity. We show this AFM-FM master-slave hierarchy is not generally valid influence ferromagnet on (MA) neighbouring...
This paper presents experimental and theoretical studies of lattice vibrations in a single-crystalline ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}(001)$ thin film. The investigations were carried out order to see how the dynamics changes at Verwey transition. Vibrational densities states (DOS) obtained from nuclear inelastic scattering (NIS) synchrotron radiation temperature range 25 296 K, while DOS calculated ab initio within density functional theory. Experimental phonon shows good agreement with...
Epitaxial Fe3O4(001)/MgO(001) films obtained by reactive molecular beam epitaxy were studied using a combination of in situ scanning tunneling microscopy (STM) and monolayer 57Fe probe Conversion Electron Mössbauer Spectroscopy (CEMS). For the as-grown ( × )R45° surface reconstruction was observed agreement with earlier studies. UHV annealing considerably improves films' quality (the lateral size terraces) but it inevitably leads to diffusion magnesium into magnetite film resulting...
A multifunctional ultrahigh vacuum (UHV) system has been set up at the nuclear resonance beamline ID18 of European Synchrotron Radiation Facility (ESRF). Thin and ultrathin films, nanoislands -wires, multilayers, stoichiometric oxides can be prepared by molecular beam epitaxy characterized low-energy electron diffraction, Auger spectroscopy, reflection high-energy diffraction. Upon characterization sample is transferred under UHV conditions to chamber for experiments with synchrotron beam....
We used the anomalous Hall effect to study magnetic properties of MgO/Fe(t)/MgO(001) structures in which Fe thickness t ranged from 4 Å 14 Å. For iron deposited at 140 K, we obtained perpendicular magnetization room temperature below critical tc = (9 ± 1) In vicinity tc, easy axis switched an out-of-plane orientation in-plane orientation, and observed spin-reorientation transition was considered terms competition among different anisotropies. The direction attributed magnetoelastic...
The structural and magnetic properties of ultrathin FeO(111) films on Pt(111) with thicknesses from 1 to 16 monolayers (MLs) were studied using the nuclear inelastic scattering synchrotron radiation. A distinct evolution vibrational characteristics thickness, revealed in phonon density states (PDOS), shows a textbook transition 2D 3D lattice dynamics. For thinnest 2 ML, low-energy part PDOS followed linear ∝E dependence energy that is characteristic for two-dimensional systems. This...
Extended experimental and theoretical study of the observed large magneto-optical anisotropy (MOA) is presented for a series ${\mathrm{Fe}}_{n}/{\mathrm{Au}}_{n}$ superlattices prepared by molecular beam epitaxy with $n=1,2,3$ Fe Au atomic planes (001) orientation. The off-diagonal component optical conductivity tensor respect to change magnetization direction determined in photon energy range 0.8--5.8 eV from measurements polar longitudinal saturated complex Kerr angles data measured...
The spatially oscillating electron spin polarization in the Ag spacer of a 4 nm Fe/20 nmAg/4 Fe(001) epitaxial trilayer has been determined by means low energy muon rotation. It oscillates with same period as interlayer exchange coupling, but shows much weaker attenuation at large distances x from interface. measured magnetization profile inner 14 is described an decaying x(-0.8(1)). This unusual behavior may arise full confinement states within spacer.
We have engineered the magnetic properties of 1--8 nm Co films epitaxially grown on an Au-buffered bifacial $\mathrm{W}(110)/\mathrm{W}(540)$ single crystal. The surface $\mathrm{Au}/\mathrm{W}(110)$ was atomically flat, whereas $\mathrm{Au}/\mathrm{W}(540)$ followed morphology vicinal W surface, showing a regular array monoatomic steps. For $\mathrm{Au}/\mathrm{W}(540)$, existence out-of-plane magnetization component extended strongly to thickness $d$ about 8 nm, which accompanied by...
We used nuclear resonant scattering (NRS) of synchrotron radiation to investigate the details thickness-induced spin reorientation transition (SRT) in ultrathin epitaxial iron films on W(110), where thicknesses ranged from 1--5 monolayers. During growth, magnetization Fe film, which was probed by hyperfine magnetic field, changes a noncollinear configuration with an out-of-plane component homogeneously magnetized state in-plane [1-10] easy direction. The fast acquisition experimental NRS...
Ultrathin FeO(001) films were grown via molecular beam epitaxy on MgO(001) using reactive deposition of Fe. The growth conditions adjusted toward stabilization the wüstite phase, existence which was confirmed by means conversion electron Mössbauer spectroscopy. It shown how metallic Fe overlayer modified chemical state and magnetic properties FeO oxide. Finally, we observed exchange bias for an epitaxial Fe/FeO bilayer MgO(001).
We report on in-plane magnetic anisotropy in epitaxial bcc Co/Fe(110) bilayers W(110). The surface the exhibited a strong nonmonotonic dependence Co coverage. Magneto-optical studies revealed sharp maximum of anisotropy, $2.44\phantom{\rule{0.16em}{0ex}}\mathrm{mJ}/{\mathrm{m}}^{2}$, at ${d}_{\mathrm{Co}}=5\phantom{\rule{0.16em}{0ex}}\AA{}$. This giant interfacial allowed small fraction monolayer to reorient magnetization bulk-like Fe film. conclude that mono- and double-layer Co(110) with...
A ferromagnet/antiferromagnet (FM/AFM) Fe/NiO bilayer was grown using molecular beam epitaxy on MgO(001) and Cr buffered substrates. X-ray linear dichroism measurements showed a dominating out-of-plane component for the NiO spins in Fe/NiO/MgO an in-plane spin direction layers buffer. Furthermore, systematic studies magnetic properties of wedge-shaped buffer revealed continuous strain-induced reorientation transition from to directions when thickness increased 0 nm 3.5 nm. The analysis...
Abstract The magnetic properties of Co(10 Å)/NiO(40 Å)/Fe trilayer epitaxially grown on W(110) substrate were investigated with use x-ray linear dichroism (XMLD) and circular (XMCD). We showed that anisotropy Fe film can be controlled by a thickness-driven spin reorientation transition is transferred via interfacial exchange coupling not only to NiO layer but further ferromagnetic Co overlayer as well. Similarly, temperature driven sublayer induces orientation simultaneous switching the...