A5048639511- Magnetic properties of thin films
- Magnetic Properties and Applications
- Theoretical and Computational Physics
- Magnetic Properties of Alloys
- Magneto-Optical Properties and Applications
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Ion-surface interactions and analysis
- Metallic Glasses and Amorphous Alloys
- Advanced Materials Characterization Techniques
- Surface Roughness and Optical Measurements
- Surface and Thin Film Phenomena
- Force Microscopy Techniques and Applications
- Geomagnetism and Paleomagnetism Studies
- Magnetic Field Sensors Techniques
- Characterization and Applications of Magnetic Nanoparticles
- Shape Memory Alloy Transformations
- Advanced Condensed Matter Physics
- Thermal Analysis in Power Transmission
- Solidification and crystal growth phenomena
- Nuclear physics research studies
- Nonlinear Dynamics and Pattern Formation
- ZnO doping and properties
- Nuclear Physics and Applications
University of Białystok
2010-2022
Institute of Molecular Physics of the Polish Academy of Sciences
2016
Polish Academy of Sciences
2016
University of Warsaw
2010
Institute of Physics
1990-2002
Czech Academy of Sciences
2000
Czech Academy of Sciences, Institute of Physics
2000
University of Warmia and Mazury in Olsztyn
1987
Complementary multiscale magneto-optical studies based on the polar Kerr effect are carried out an ultrathin cobalt wedge covered with a silver and subsequently Au thick layer. A few monolayers of Ag found to have substantial magnetic anisotropy, coercivity field, rotation. The overlayer thickness-driven reorientation from easy axis plane generates new type 90 degrees wall for thicknesses between 1.3 1.8 nm. tuning width in wide range is possible. Tailoring structure can be used film patterning.
Magnetization-reversal processes in a ferromagnetic cobalt film structure (Au/Co/Au), with perpendicular anisotropy, were investigated by magneto-optical magnetometry and microscopy. In the considered ultrathin Co film, magnetization reversal between two Ising-spin equilibrium states is dominated domain-wall motion mechanism. We focused our studies on initiated from given demagnetized state. Starting magnetically saturated state generated under large field ${\mathrm{H}}_{\mathrm{S}}$,...
The results of combined (experimental, analytical, and micromagnetic simulations) studies on the evolution magnetization states processes in ultrathin films multilayered systems are presented. We show ways to manipulate distributions magnetic single or multilayers by tuning: thickness layer, either non‐magnetic cap spacer anisotropy, geometrical constrictions system. In films, both distribution critical reorientation phase transition (RPT) between perpendicular in‐plane can be also...
We show, combining simulations and analytical study, the evolution of magnetization distributions in ultrathin film with in-plane fields ${(H}_{\ensuremath{\parallel}})$ changes magnetic anisotropy characterized by quality factor, Q. Reconstruction their new types near Q or ${H}_{\ensuremath{\parallel}}$-induced reorientation phase transitions, from a domain structure (DS) perpendicular into state magnetization, are reported. Sinusoidal-like DS exist for ${H}_{\ensuremath{\parallel}}$ larger...
An elegant route for tuning the magnetic anisotropy of ultrathin Co films by Ga+ ion irradiation is presented. The a Pt/Co(2.6 nm)/Pt film first changed from in-plane to out-of-plane uniform low dose at 30 keV. When increasing dose, second spin reorientation transition toward sample plane also evidenced. This could be way design nanowires with perpendicular anisotropy, embedded in an magnetized environment, either through mask or focused beam. Tentative explanations on origin these two...
A general framework for the domain size in any ultrathin film with perpendicular magnetic anisotropy is here discussed. The structure analyzed by using classical theory taking into consideration demagnetization field contribution to wall energy. sinusoidal model considered describe while approaching, two different cases, monodomain state in-plane magnetization. first case realized applying a large enough field. second one obtained decreasing anisotropy, which connected many systems increase...
Magnetization states of laterally limited ultrathin nanostructures (semi-infinite film edges, wires, and disks) with low magnetic uniaxial anisotropy are studied analytically by micromagnetic simulations. A general view geometrically constrained magnetization distributions is given. By shrinking the lateral size a sample one can induce reorientation from an in-plane to out-of-plane state. As examples, phase diagrams have been calculated for cobalt nanowires disks. In low-anisotropy nanodisks...
The spatial distribution of magnetic properties studied by polar Kerr-effect-based magnetometry are carried out on an ultrathin cobalt wedge covered with a silver whose slopes perpendicular to each other and subsequently capped gold layer. coercivity field was as function both thickness d h. A few monolayers Ag were found have substantial influence the field. similar strong coverage anisotropy observed. Domain structure evolution during magnetization reversal is investigated using optical...
(Co/Au)N ultrathin multilayers with perpendicular and in-plane magnetic anisotropy were studied experimentally using a combination of ferromagnetic resonance, magneto-optical magnetometry microscopy (with both out-of-plane magnetization-sensitive longitudinal polar Kerr effects), force (MFM). Three-dimensional magnetization distributions reconstructed from micromagnetic simulations complemented by the measured parameters observations MFM. It is shown that, in reorientation phase transition...
Abstract To succeed in the next generation of magnetic storages, nanomagnetic structures must be engineered to allow modulation magnetization amplitude and spatial period. We demonstrate computationally how nanostructures states (domains with narrow wall, skyrmions, spin spirals, conical in-plane configuration) can designed ultrathin films a Dzyaloshinskii–Moriya interaction (DMI) by adjusting two material parameters: perpendicular anisotropy characterized quality factor Q , reduced DMI...
We present ferromagnetic resonance (FMR) investigations of 20 nm thick permalloy (${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$) elements (width $W=200$ nm, length $L=470$ period $a=500$ nm) arranged in open and closed artificial kagome lattices. The measurements were done at 9.4 34 GHz to ensure a saturated or near-saturated magnetic state the structures. FMR data are analyzed framework an analytical macrospin model which grasps essential features bulk edge modes these microwave frequencies is...
Ultrathin magnetic films are considered where the thickness-induced second order phase transition occurs due to surface anisotropy changes. By increasing thickness, easy magnetization axis state passes through cone (for film thickness t: t1 < t t2) into plane state. The characteristic material length lc (defined as ratio of domain wall energy density demagnetization energy) was calculated up t2. exact determination stripe period, p, proposed, applying transcendent Lerch functions classical...
Regular sets of ultranarrow lines have been patterned on a Pt/Co(1.4 nm)/Pt ultrathin magnetic film by focusing Ga+ ion beam (FIB) at different fluences. irradiation is known to soften properties in such films. Even low fluence, and as proved atomic force microscopy, the transverse perturbed region much wider than calculated Stopping Range Ions Matter (SRIM) simulations, demonstrating that swelling effect superimposes more localized damages. Field-induced magnetization reversal static or...
Multilayers of (F/NF)N composition, where F means a ferromagnetic layer, NF nonferromagnetic one, and N the number repetitions, are studied by simulations theoretically for different magnetic anisotropy characterized quality factor, Q (the ratio energy to be gained magnetization along easy axis perpendicular sample surface magnetostatic uniformly magnetized layer normal). It is shown that range existence out-of-plane states could extended Q&lt;1 proper choice layers thicknesses. The role...
The domain wall caused by magnetic field pulses as well an AC sinusoidal was analysed in Co-containing garnet films. These films show substantial after-effect at room temperature. Domain-structure shape memory found the sample. This can be erased. Magnetic influence on domain-wall velocity abruptly decreased using sufficiently fast (pulses shorter than about several ms).
Abstract We review the evolution of magnetization distributions in samples with low magnetic perpendicular‐anisotropy described by quality factor Q (the relation between anisotropy and demagnetization energies). Infinite ultrathin films, nanowires disks are studied using real parameters determined for cobalt. By micromagnetic simulations we demonstrate novel types distributions. Reconstructions at spin reorientation transition (RPT) from perpendicular to in‐plane state discussed. show that...
30 keV Ga + irradiation-induced changes of magnetic and magneto-optical properties sputtered Pt/Co/Pt ultrathin trilayers films have been studied as a function the ion fluence.Out-of-plane anisotropy states with enhanced effects were evidenced for specific values cobalt thickness irradiation fluence.Results obtained after uniform or quasi-uniform focused beam on either out-of-plane in-plane magnetized pristine are compared.Similar in quasi-uniformly uniformly irradiated films, grown by...