scholarly journals Dual Band Magnonic Crystals: Model System and Basic Spin Wave Dynamics

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Federico Montoncello ◽  
Loris Giovannini
Keyword(s):  
Test System ◽  
Model System ◽  
Dual Band ◽  
Special Design ◽  
Wave Dynamics ◽  
Lattice Constants ◽  
Simultaneous Excitation ◽  
Basic Spin ◽  
Magnonic Crystals ◽  
Subsequent Propagation

We investigate a special design of two-dimensional magnonic crystal, consisting of two superimposed lattices with different lattice constants, such that spin waves (SWs) can propagate either in one or the other sublattice, depending on which of the two frequency bands they belong to. The SW bands are separated by a very large bandgap (in our model system, 6 GHz), easily tunable by changing the direction of an applied magnetic field, and the overlap of their spatial distribution, for any frequency of their bands, is always negligible. These properties make the designed system an ideal test system for a magnonic dual band waveguide, where the simultaneous excitation and subsequent propagation of two independent SW signals are allowed, with no mutual interference.

Reconfigurable spin-wave dynamics in two-dimensional quasiperiodic magnonic crystals

2021 ◽  
pp. 114901
Author(s):  
Sudip Majumder ◽  
Samiran Choudhury ◽  
Saswati Barman ◽  
Yoshichika Otani ◽  
Anjan Barman
Keyword(s):  
Spin Wave ◽  
Two Dimensional ◽  
Wave Dynamics ◽  
Magnonic Crystals

scholarly journals Effects of nanodots shape and lattice constants on the spin wave dynamics of patterned permalloy dots

AIP Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 015008
Author(s):  
Nikita Porwal ◽  
Jaivardhan Sinha ◽  
Prasanta Kumar Datta
Keyword(s):  
Spin Wave ◽  
Wave Dynamics ◽  
Lattice Constants

A Miniaturized Dual-Band FSS with Closely Spaced Resonances Using 2.5-Dimension Structure

Frequenz ◽  
2018 ◽  
Vol 72 (11-12) ◽  
pp. 511-515 ◽  
Author(s):  
Weiyang Yin ◽  
Hou Zhang ◽  
Tao Zhong ◽  
Xueliang Min
Keyword(s):  
Resonant Frequency ◽  
Free Space ◽  
Frequency Ratio ◽  
Surface Current ◽  
Dual Band ◽  
Operating Mechanism ◽  
Special Design ◽  
Measurement Results ◽  
Simulation Results ◽  
The Operating Mechanism

Abstract Using 2.5-dimension structure, a novel miniaturized dual-band FSS with closely spaced resonances is proposed in the paper. The special design of the geometry contributes to two closely spaced resonances at 1.69 GHz and 2.16 GHz respectively and the frequency ratio of upper to the lower resonant frequency is 1.27. Besides, the two bands can be controlled individually by varying corresponding parameters. The size of the proposed FSS is only 0.057λ0, where the λ0 represents free space wavelength at lower resonant band. Furthermore, the simulation results show the proposed FSS exhibits stable response with different incident angles and polarizations. To understand the design better, the distribution of surface current is analyzed to explain the operating mechanism of the proposed FSS. Finally, the proposed FSS is fabricated and the measurement results are in accordance with the simulation results.

Shape dependent high frequency spin-wave dynamics in nanoscale magnonic crystals

2019 ◽  
Vol 487 ◽  
pp. 165263
Author(s):  
Anulekha De ◽  
Sucheta Mondal ◽  
Samiran Choudhury ◽  
Sourav Sahoo ◽  
Sudip Majumder ◽  
...  
Keyword(s):  
Spin Wave ◽  
High Frequency ◽  
Wave Dynamics ◽  
Magnonic Crystals

scholarly journals Metal–insulator switching of vanadium dioxide for controlling spin-wave dynamics in magnonic crystals

2020 ◽  
Vol 128 (18) ◽  
pp. 183902
Author(s):  
Aleksei A. Nikitin ◽  
Andrey A. Nikitin ◽  
Alexey B. Ustinov ◽  
Andrey E. Komlev ◽  
Erkki Lähderanta ◽  
...  
Keyword(s):  
Spin Wave ◽  
Vanadium Dioxide ◽  
Metal Insulator ◽  
Wave Dynamics ◽  
Magnonic Crystals

scholarly journals Effect of the Level of Irradiance on Growth and Content of Photosynthetic Pigments of Canadian Elodea (Elodea canadensis) in Model System “Water-Bottom Sediments”

2020 ◽  
pp. 188-196
Author(s):  
Yuliyana V. Aleksandrova ◽  
Tatiana A. Zotina ◽  
Nikolay A. Gaevsky
Keyword(s):  
Flux Density ◽  
Bottom Sediments ◽  
Photosynthetic Pigments ◽  
Light Flux ◽  
Experimental System ◽  
Test System ◽  
Model System ◽  
Elodea Canadensis ◽  
System Response ◽  
Chl A

Bioassays based on aquatic plants are a convenient tool for studying the quality of bottom sediments. One of the stages in the development of a bioassay is the selection of optimal growth conditions for indicator plants in a model test system. Response of indicator physiological endpoints of Canadian waterweed (Elodea canadensis) to light flux density was investigated to determine optimal irradiance level in a “water – sediment” model system, proposed previously for contact bioassay of natural bulk bottom sediments. Based on the response of shoot and root growth (length and weight), and concentration and ratio of photosynthetic pigments (chl. a, chl. b, and carotenoids) of Elodea to the change of light flux density, no limitation or inhibition of growth and photosynthesis of Elodea was revealed at light flux density from 56 to 143 μmol quanta ∙ m-2 ∙ s-1. Hence, the level of irradiance within this range can be recommended for use in the experimental system proposed for bioassay of bulk bottom sediments using E. canadensis as an indicator

SPIRAL WAVE MEANDER AND SYMMETRY OF THE PLANE

1996 ◽  
Vol 06 (12a) ◽  
pp. 2433-2440 ◽  
Author(s):  
V. N. BIKTASHEV ◽  
A. V. HOLDEN ◽  
E. V. NIKOLAEV
Keyword(s):  
Reduction Method ◽  
A Priori ◽  
Spiral Wave ◽  
Model System ◽  
Theoretic Approach ◽  
General Group ◽  
Wave Dynamics ◽  
Space Reduction ◽  
Wave Solutions ◽  
Euclidean Symmetry

We present a general group-theoretic approach that explains the main qualitative features of the meander of spiral wave solutions on the plane. The approach is based on the well-known space reduction method and is used to separate the motions in the system into superposition of those ‘along’ orbits of the Euclidean symmetry group, and ‘across’ the group orbits. It can be interpreted as passing to a reference frame attached to the spiral wave’s tip. The system of ODEs governing the tip movement is obtained. It is the system that describes the movements along the group orbits. The motions across the group orbits are described by a PDE which lacks the Euclidean symmetry. Consequences of the Euclidean symmetry on the spiral wave dynamics are discussed. In particular, we explicitly derive the model system for bifurcation from rigid to biperiodic rotation, suggested earlier by Barkley [1994] from a priori symmetry considerations.

scholarly journals Spin-wave dynamics in permalloy/cobalt magnonic crystals in the presence of a nonmagnetic spacer

2015 ◽  
Vol 92 (6) ◽  
Author(s):  
P. Malagò ◽  
L. Giovannini ◽  
R. Zivieri ◽  
P. Gruszecki ◽  
M. Krawczyk
Keyword(s):  
Spin Wave ◽  
Wave Dynamics ◽  
Magnonic Crystals ◽  
Nonmagnetic Spacer

A Protozoan Model for Golgi-Associated Calcification

1971 ◽  
Vol 29 ◽  
pp. 332-333
Author(s):  
D. C. Williams ◽  
D. E. Outka
Keyword(s):  
Golgi Apparatus ◽  
Organic Matrix ◽  
Model System ◽  
Sequential Formation

Many studies have shown that the Golgi apparatus is involved in a variety of synthetic activities, and probably no Golgi product is more elaborate than the scales produced by various kinds of phytoflagellates. The formation of calcified scales (coccoliths, Fig. 1,2) of the coccolithophorid phytoflagellates provides a particularly interesting model system for the study of biological mineralization, and the sequential formation of Golgi products.The coccoliths of Hymenomonas carterae consist of a scale-like base (Fig. 2 and 4, b) with a highly structured calcified (CaCO3) rim composed of two distinct elements which alternate about the base periphery (Fig. 1 and 3, A, B). Each element is enveloped by a sheath-like organic matrix (Fig. 3; Fig. 4, m).

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