Interfacial Dzyaloshinskii-Moriya interaction (DMI) is experimentally investigated in Pt/Co/Pt multilayer films under strain. A strong variation (from 0.1 to 0.8 mJ/m^{2}) of the DMI constant demonstrated at ±0.1% in-plane uniaxial deformation films. The anisotropic strain induces anisotropy. perpendicular direction changes sign, while along does not. Estimates show that can be controlled with an electric field hybrid ferroelectric-ferromagnetic systems. So, observed effect opens way control...

We show that granular media, consisting of metallic microparticles immersed in a poorly conducting liquid strong dc electric field, self-assemble into rich variety novel phases. These phases include static precipitates: honeycombs and Wigner crystals; dynamic condensates: toroidal vortices pulsating rings. The observed structures are explained by the interplay between charged gas electrohydrodynamic convective flows liquid.

Co/Pt multilayers with perpendicular magnetic anisotropy are irradiated by focused He+ ion beam to locally reduce the value. The spots a diameter of 100 nm arranged in square lattice 200 period. formation nonuniform periodic structure is observed without changes film topography. spatial symmetry force microscopy signal and specific shape magnetization curves indicate bubbles or vortices within spot depending on irradiation dose. experimental data good agreement micromagnetic simulations system.

We study velocity statistics of electrostatically driven granular gases. For two different experiments, (i) nonmagnetic particles in a viscous fluid and (ii) magnetic air, the distribution is non-Maxwellian, its high-energy tail exponential, $P(v)\ensuremath{\sim}\mathrm{exp}(\ensuremath{-}|v|)$. This behavior consistent with kinetic theory dissipative particles. immersed fluid, damping responsible for exponential tail, while particles, long-range interactions cause tail. conclude that gases...

We study skyrmion control in an artificial ultrathin magnetic film with perpendicular anisotropy. simulate numerically the motion induced by spatial gradient of Dzyaloshinskii–Moriya interaction (DMI) strength. show that creating DMI is efficient way to move skyrmions. In particular, experimentally achievable gradients can be as effective spin-polarized electric currents 1011 A/m2 density. At that, induces a much weaker Hall effect. The created mechanical strain ferroelectric–ferromagnetic...

We report on the design of a spintronic emitter based Pt(3 nm)/Co(3 nm) structure, which enables control over terahertz radiation polarization. Utilizing field-induced magnetization rotation that takes place at low magnetic fields up to 250 Oe room temperature, we have achieved full range polarization from 0° 360°. This became possible due uniaxial anisotropy induced in plane cobalt film during its fabrication. evaluated efficiency Co/Pt structure generating and found pulse energy flux...

Laser sputtering of solid-state targets in a hydrogen atmosphere has been used to form semiconductor nanoheterostructures. Impurities (Te or Mn) the delta-doped layers obtained by laser corresponding process vapor-phase epitaxy using organometallic compounds can be introduced into light-emitting structures based on InGaAs∕GaAs system make it possible control spectrum and electroluminescence intensity. Reducing pressure reactor 25–50Torr allows deposition carried out at reduced temperatures...

A method consisting of simultaneous measurements a Hall effect and magneto-optic Kerr is used to study topological in thin ferromagnetic films. The based on the idea that values effects are different at dc optical frequencies. artificial lattices magnetic bubbles nanostructured Co/Pt multilayers with perpendicular anisotropy investigated using this method. Lorentz transmission electron microscopy demonstrate skyrmionic topology bubbles. measured proportional skyrmion density system.

We consider localized topologically nontrivial magnetic textures (skyrmions, antiskyrmions, and bimerons) in a thin film with anisotropic interfacial Dzyaloshinskii-Moriya interaction (iDMI). use micromagnetic simulations analytical consideration for studying the internal structure stability of these textures. Skyrmion antiskyrmion become elliptic orient along main axes iDMI tensor even small anisotropy. In contrast, bimeron (antibimeron) orientation changes fluently varying Depending on...

We report an experimental study of the optical properties a two-dimensional square lattice triangle Co and CoFe nanoparticles with vortex magnetization distribution. demonstrate that intensity light scattered in diffraction maxima depends on vorticity particles' can be manipulated by applying external magnetic field. The results understood terms simple phenomenological consideration.

Magnetic properties of hexagonal lattices touching magnetic nanocaps fabricated by Co film deposition on a surface polymethyl methacrylate colloidal crystals was studied as function both period (120--450 nm) and thickness (30--60 nm). Magnetization configurations hysteresis loops the samples were investigated magneto-optic Kerr effect force microscopy. Formation frustrated vortices found in system. coupling can be tuned changing deposited film, leading to change magnetization loop....

We study the possibility of a two-dimensional (2D) skyrmion crystal stabilization in magnetic film with perpendicular anisotropy absence Dzyaloshinskii-Moriya interaction by creating regular array blind holes or stubs. By micromagnetic simulation we demonstrate that skyrmions can be stable patterned films parameters ordinary materials such as CoPt, FePt, FePd. The lattices initialized system simple magnetization uniform external field. At zero field helicity depends on geometry hole stub but...

We develop continuum theory of self-assembly and pattern formation in metallic microparticles immersed a poorly conducting liquid DC electric field. The is formulated terms two conservation laws for the densities immobile particles (precipitate) bouncing (gas) coupled to Navier-Stokes equation liquid. This successfully reproduces correct topology phase diagram primary patterns observed experiment [Sapozhnikov et al, Phys. Rev. Lett. v. 90, 114301 (2003)]: static crystals honeycombs dynamic...

We report here on optical and magneto-optical spectra investigations of nanostructured Co Ni films deposited top polymethyl methacrylate (PMMA) colloidal crystal. Resonant peculiarities have been observed in both spectra; their positions are scaled with the PMMA sphere diameter depend incident angle. Asymmetry resonance lineshapes as well change direction rotation has observed. Both surface plasmon interference between reflections from crystal film should be considered to explain obtained results.

The problem of the skyrmion stability in magnetic film with perpendicular anisotropy covered a superconducting layer is considered. expression energy derived analytically within London model for superconductor. It shown that can be stabilized by dot or antidot even absence Dzyaloshinskii–Moriya interaction. corresponding conditions are obtained numerically. wide range material and geometrical parameters system analyzed.

We report on an experimental study of small cluster dynamics during the coarsening process in driven granular submonolayers 120-microm bronze particles. The techniques electrostatic and vertical mechanical vibration were employed to excite gas. measure scaling exponent for evaporation clusters coarsening. It was found that surface area S vs time t behaves as (t(0)-t)(2/3) lower frequencies (t(0)-t) higher frequencies. argue change is related transition from three-dimensional (3D) 2D character motion

We carried out experimental studies of the self-assembly metallic micron-size particles in poorly conducting liquid subject to a constant electric field. Depending on conditions, self-assemble into long chains directed along field lines and form vortices other structures. The perform Brownian-type random motion due self-induced chaotic hydrodynamic flows. measured diffusivity conductivity mechanical stiffness chains.

Linear and nonlinear optical properties of a thin planar CoFe/Al2O3/CoFe structure for different angles incidence the fundamental radiation are studied by means magneto-optical Kerr effect magnetization-induced second-harmonic generation (SHG). The composition this multilayered supports appearance antiferromagnetic state, which leads to nonreciprocal effects is discussed in terms magnetic toroid moment. We show that accordance with phenomenological description, SHG hysteresis loops linearly...