Spinwave propagation in yttrium iron garnet (YIG) films has a long history but has recently attracted renewed attention due to the observation of an unusual coherent phenomenon in a heavily pumped magnon gas in the backward volume geometry where the spectrum displays a minimum. The effect has been termed Bose condensation or, from a more classical perspective, a Rayleigh-Jeans condensation....
Hole-doped rare-earth manganites, like La0.66Sr0.33MnO3 (LSMO), display peculiar phenomena such as colossal magnetoresistance and half-metallicity, originating from the competition between charge, spin, and orbital order parameters [1]. Optimally doped LSMO thin films can be used to realize fully spin polarized currents (the spin polarization at the Fermi level reaches about 100% for T<TCurie...
The confinement in magnetic structure is responsible not only for the quantization of spin wave modes due to geometrical constraints but also determines the dipolar interactions. Although the magnetic wires were already [1] broadly investigated, some of their dynamical properties, like: (anti)crossing between the spin wave modes and the impact of the magnetic field on the spin wave spectrum,...
We study transitions of 1D systems of macrospins between their equilibrium configurations under a uniform magnetic field and under variations of the distances of the macrospins in such chains. A magnetic field opens a gap at the Brillouin zone border, giving room to bound edge states. If the number of macrospins in the chain is odd, two bound states, symmetric and antisymmetric, appear in the...
Fabrication and modeling of patterned thin films with perpendicular magnetic anisotropy rise great interest due to their wide applications in magnetic storage, sensors and magnonic crystals. A good representative of such systems are well-ordered arrays of magnetic antidots and dots based on Co/Pd multilayers, where magnetic reversal mechanisms strongly depend on the array geometry [1, 2]. We...
The investigation of innovative dynamical processes for the fabrication of highly doped and
high quality Ge layers is currently a hot topic in many applicative fields such as
nanoelectronics, photonics and radiation detectors. Challenges that require a deep physical
and material science investigation are: i) the high electrical activation in narrow region that
can be obtained by out of...
A. Horzela$^1$, K. Górska$^1$, A. Lattanzi$^1$
Andrzej.Horzela@ifj.edu.pl
$^1$Institute of Nuclear Physics IFJ PAN, ul. Radzikowskiego 152, 31-342 Kraków, Poland
The Debye model of dielectric relaxation provides us with the simplest shape of spectral functions, i.e. relations connecting characteristics of polarized dielectric medium and the frequency $ω$ of the polarizing electric field. An...
The standard approach to represent the experimentally measured data depending on some continuous parameter is to draw them as a curve, i.e. as a continuous function which fits the experimental points and hopefully follows some theoretical explanation. The most typical illustration of such procedure is a graphical representation of the time evolution of some physically relevant quantity....
Metal closo-borate compounds have attracted recent attention as superionic lithium or sodium conductors. In Na2B12H12 or Li2B12H12 the superionic phases are related to the temperature induced phase transitions [1]. Modification of the crystal structure or ion substitution provide the means of tuning their cation conductivity. Spectroscopic fingerprint of internal closo anion (B12H122-)...
Adsorption of oxygen species on the SnO2 (110) defective surface: a DFT investigation
The Debye model presents an essential and elegant description for the relaxation phenomena based on statistical mechanics. However, this model describes systems characterized by a single relaxation time as perfect liquids and crystals, quite far for the complexity which affects almost all amorphous and glassy materials.
The Debye model has been used as a starting point for other dielectric...
In metals, the details of the Fermi surface and the magnitude of the matrix elements connecting different points defined on it determine most of their transport properties, which are limited by the electron-phonon coupling and the scattering by impurities. Typically, the calculation of an anisotropic physical property defined on the Fermi surface, say in an impurity or Boltzmann transport...
Computational investigation of anharmonic and temperature-dependent aspects of lattice dynamics requires, among other things, replication of the conditions of thermal equilibrium. This requirement is very challenging when performing quantum mechanical calculations. Typically, it involves large number of atoms and long simulation times needed to approximate thermodynamical limit conditions....
Previous and current researches in agreement with industrial needs, aim to reduce the dimensions, reduce the price and enhance the sensing performances. Due to their low-cost production, their possibility of miniaturization and their good sensitivity, metal oxides chemical sensors are attracting particular attention. In this study, we report the preparation of ZnO and other new materials such...
Low-dimensional chemical sensors based on metal oxides have received great attention for the applications in security and medical diagnoses. Transition oxide nanomaterials exhibit promising sensing performance owing to their large surface area and good chemical stability. However, the sensing performance of these materials have yet to reach to their full potential in capabilities and usage....
