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Chekhov A.L.,Moscow State University | Krutyanskiy V.L.,Moscow State University | Shaimanov A.N.,Moscow State University | Stognij A.I.,Institute of Solid State and Semiconductor Physics | Murzina T.V.,Moscow State University
Optics Express | Year: 2014

Magnetoplasmonic crystals (MPC) composed of a 1D gold grating on top of a magnetic garnet layer made by a combined ion-beam etching technique are studied. We demonstrate that this method allows to make high-quality MPC. It is shown that MPC with a 30-40 nm thick perforated gold layer provides an effective excitation of two surface plasmon-polariton modes and several numbers of waveguide modes in the garnet layer. An enhancement of the transversal magneto-optical effect up to the value of 10-2 is observed for all types of resonant modes, that propagate in the magnetic layer, due to magnetic-field control over the mode excitation which is promising for future photonic devices. © 2014 Optical Society of America. Source


Mitryukovskiy S.I.,ENSTA ParisTech | Nikulin A.A.,Moscow State University | Stognij A.I.,Institute of Solid State and Semiconductor Physics | Murzina T.V.,Moscow State University
Applied Physics Letters | Year: 2013

Optical second-harmonic (SH) generation in planar Au/Co/Si(111) nanostructures under application of static magnetic and electric fields is studied experimentally. The crystallographic, magneto- and electroinduced contributions to the SH intensity reveal strong azimuthal anisotropy peculiar to the Si(111) surface. The transient times characterizing the electroinduced quadratic response are found to exceed 1 s. Relative amplitudes and phases of the magneto- and electroinduced constituents of the SH signal are estimated from the measurements data. © 2013 AIP Publishing LLC. Source


Rutkevich S.,University of Duisburg - Essen | Rutkevich S.,Institute of Solid State and Semiconductor Physics | Diehl H.W.,University of Duisburg - Essen | Shpot M.A.,University of Duisburg - Essen | Shpot M.A.,Institute for Condensed Matter Physics
Nuclear Physics B | Year: 2011

The theory of generalized local scale invariance of strongly anisotropic scale invariant systems proposed some time ago by Henkel [M. Henkel, Phenomenology of local scale invariance: from conformal invariance to dynamical scaling, Nucl. Phys. B 641 (3) (2002) 405-486] is examined. The case of so-called type-I systems is considered. This was conjectured to be realized by systems at m-axial Lifshitz points; in support of this claim, scaling functions of two-point cumulants at the uniaxial Lifshitz point of the three-dimensional ANNNI model were predicted on the basis of this theory and found to be in excellent agreement with Monte Carlo results [M. Pleimling, M. Henkel, Anisotropic scaling and generalized conformal invariance at Lifshitz points, Phys. Rev. Lett. 87 (12) (2001) 125702]. The consequences of the conjectured invariance equations are investigated, with emphasis put on this case. It is shown that fewer solutions than anticipated by Henkel generally exist and contribute to the scaling functions if these equations are assumed to hold for all (positive and negative) values of the d-dimensional space (or space time) coordinates (t,r)∈R{double-struck}×R{double-struck}d-1. Specifically, a single rather than two independent physically acceptable solutions exists in the case relevant for the mentioned fit of Monte Carlo data for the ANNNI model. Renormalization-group improved perturbation theory in 4+m/2-∈ dimensions is used to determine the scaling functions of the order-parameter and energy-density two-point cumulants in momentum space to two-loop order. The results are mathematically incompatible with Henkel's predictions except in free-field-theory cases. However, the scaling function of the energy-density cumulant we obtain for m=1 upon extrapolation of our two-loop RG results to d=3 differs numerically little from that of an effective free field theory. © 2010 Elsevier B.V. Source


Lin S.-Z.,Los Alamos National Laboratory | Barros K.,Los Alamos National Laboratory | Mun E.,Los Alamos National Laboratory | Kim J.-W.,Los Alamos National Laboratory | And 5 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2014

We introduce a minimal spin model for describing the magnetic properties of CuCrO2. Our Monte Carlo simulations of this model reveal a rich magnetic-field-induced phase diagram, which explains the measured field dependence of the electric polarization. The sequence of phase transitions between different multiferroic states arises from a subtle interplay between spatial and spin anisotropy, magnetic frustration, and thermal fluctuations. Our calculations are compared to new measurements up to 92 T. © 2014 American Physical Society. Source


Rutkevich S.B.,Institute of Solid State and Semiconductor Physics
Journal of Statistical Mechanics: Theory and Experiment | Year: 2010

In a recent paper Coldea et al (2010 Science 327 177) report observations of the weak confinement of kinks in the Ising spin chain ferromagnet CoNb 2O6 at low temperatures. To interpret the entire spectra of magnetic excitations measured via neutron scattering, they introduce a phenomenological model, which takes into account only the two-kink configurations of the spin chain. We present the exact solution of this model. The explicit expressions for the two-kink bound-state energy spectra and for the relative intensities of neutron scattering on these magnetic modes are obtained in terms of the Bessel function. © 2010 IOP Publishing Ltd and SISSA. Source

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