Diffraction patterns of the backward spin wave exited in ferrite film by linear transducer

2016 ◽  
Author(s):  
Герус ◽  
Sergey Gerus ◽  
Локк ◽  
Edvin Lokk
Keyword(s):  
Spin Wave ◽  
Wave Beam ◽  
Wave Length ◽  
Beam Width ◽  
Angular Width ◽  
Ferrite Film ◽  
Linear Transducer ◽  
Diffraction Patterns ◽  
Plane Distribution ◽  
Good Agreement

Visualized diffraction patterns describing in-plane distribution of the backward spin wave beam, excited by linear transducer, are investigated for the case when the spin wave length is much smaller than the transducer length. The angular width of the spin-wave beams is founded for several geometries experimentally and theoretically. There is good agreement between the experimental and theoretical values of the angular beam width.

Diffraction patterns and angular width of the surface spin wave beams exited in ferrite film by linear transducer

2016 ◽  
Author(s):  
Герус ◽  
Sergey Gerus ◽  
Локк ◽  
Edvin Lokk ◽  
Анненков ◽  
...  
Keyword(s):  
Spin Wave ◽  
Theoretical Calculations ◽  
Wave Length ◽  
Beam Width ◽  
Angular Width ◽  
Ferrite Film ◽  
Linear Transducer ◽  
Surface Spin ◽  
Diffraction Patterns ◽  
Plane Distribution

Visualized diffraction patterns describing in-plane distribution of the surface spin wave beam, excited by linear transducer, are investigated for the case when the spin wave length is much smaller than the transducer length. On the basis of experimental diffraction patterns and on the basis of theoretical calculations (both numerically and based on obtained previously general formula) the angular width of the spin-wave beams is founded for several geometries. There is good agreement between the experimental and theoretical values of the angular beam width.

scholarly journals Superdirected beam of the backward volume spin wave

2018 ◽  
Vol 185 ◽  
pp. 02006 ◽  
Author(s):  
Alexander Yu. Annenkov ◽  
Sergey V. Gerus ◽  
Edwin H. Lock
Keyword(s):  
Spin Wave ◽  
Beam Energy ◽  
Film Surface ◽  
Angular Width ◽  
Ferrite Film ◽  
Linear Transducer

Visualized patterns of the backward volume spin wave (BVSW) excited by arbitrarily oriented linear transducer in tangentially magnetized ferrite film are investigated experimentally in the plane of ferrite film for the case where the transducer length D is much larger than the wavelength λ0. Superdirected BVSW beam having zero angular width and minimal smearing of the beam energy along the film surface is observed experimentally. Thus, it is proved that such phenomenon as “superdirected propagation of the wave” exists in the nature.

Comparison of a diffraction pattern of the surface spin wave beam with distribution of its magnetic potential in the plane of ferrite film

2016 ◽  
Author(s):  
Герус ◽  
Sergey Gerus ◽  
Локк ◽  
Edvin Lokk ◽  
Анненков ◽  
...  
Keyword(s):  
Diffraction Pattern ◽  
Spin Wave ◽  
Wave Beam ◽  
Film Plane ◽  
Magnetic Potential ◽  
Ferrite Film ◽  
Experimental Diffraction Pattern ◽  
Pattern Distribution ◽  
Surface Spin ◽  
Plane Distribution

The visualized diffraction pattern of the surface spin wave beam excited by the linear transducer in tangentially magnetized ferrite film was compared with calculated in-plane distribution of magnetic potential of this beam. It is found that distribution of the wave magnetic potential and experimental diffraction pattern (distribution) of the spin wave in the film plane are in good agreement not only for the film area, where is localized main diffractive beam, but also for the area where the maxima of lower order are located.

scholarly journals Spin-wave-beam driven synchronization of nanocontact spin-torque oscillators

2015 ◽  
Vol 11 (3) ◽  
pp. 280-286 ◽  
Author(s):  
A. Houshang ◽  
E. Iacocca ◽  
P. Dürrenfeld ◽  
S. R. Sani ◽  
J. Åkerman ◽  
...  
Keyword(s):  
Spin Wave ◽  
Wave Beam ◽  
Spin Torque ◽  
Spin Torque Oscillators

High-power pumping wave influence on the volume spin wave propagation in a ferrite film

2000 ◽  
Vol 26 (4) ◽  
pp. 315-317
Author(s):  
Yu. K. Fetisov
Keyword(s):  
Wave Propagation ◽  
Spin Wave ◽  
High Power ◽  
Ferrite Film

The continuous absorption of light in alkali-metal vapours

1953 ◽  
Vol 219 (1136) ◽  
pp. 89-101 ◽  
Keyword(s):  
Cross Section ◽  
Alkali Metals ◽  
Theoretical Calculations ◽  
Wave Length ◽  
Energy Difference ◽  
Continuous Absorption ◽  
Absorption Of Light ◽  
Sodium Vapour ◽  
Good Agreement ◽  
Dipole Length

The first section of this paper is an account of some experiments on the absorption of light in sodium vapour from the series limit at 2412 Å to about 1600 Å (an energy difference of 2·6 eV). The absorption cross-section at the limit is 11·6 ± 1·2 x 10 -20 cm 2 . The cross-section decreases giving a minimum of 1·3 ± 0·6 x 10 -20 cm 2 at 1900 Å and then increases to 1600 Å. A theoretical calculation by Seaton based on the dipole-length formula gives good agreement with the experiments at the series limit and also correctly predicts the wave-length for the minimum, but it predicts a significantly lower absorption at the minimum. The experiments described in the first section of the paper conclude a series on the absorption of light in the alkali metals. The second section consists of a general discussion of the results of these experiments and of their relation to theoretical calculations. There is good agreement between theory and experiment except in regard to the magnitude of the absorption at the minimum.

scholarly journals Analysis of the broadband chaotic spin-wave excitations in an active ring oscillator based on a metalized ferrite film

2016 ◽  
Vol 769 ◽  
pp. 012089
Author(s):  
A V Kondrashov ◽  
A B Ustinov ◽  
B A Kalinikos ◽  
S O Demokritov
Keyword(s):  
Spin Wave ◽  
Ring Oscillator ◽  
Ferrite Film ◽  
Spin Wave Excitations ◽  
Active Ring

MONTE CARLO STUDY OF THE SPIN-1/2 HEISENBERG MODEL IN 1, 2, AND 3 DIMENSIONS

1991 ◽  
Vol 05 (13) ◽  
pp. 907-914 ◽  
Author(s):  
RICHARD J. CRESWICK ◽  
CYNTHIA J. SISSON
Keyword(s):  
Monte Carlo ◽  
High Temperature ◽  
Spin Wave ◽  
Heisenberg Model ◽  
Transition Probability ◽  
Lattice Models ◽  
Wave Theory ◽  
Temperature Expansion ◽  
High Temperature Expansion ◽  
Good Agreement

The properties of the spin-1/2 Heisenberg model on 1, 2, and 3-dimensional lattices are calculated using the Decoupled Cell Method of Homma et al., and these results are compared with high temperature and spin-wave expansions, and with other numerical approaches. The DCM has advantages over other Monte Carlo methods currently in wide use in that the transition probability is positive definite, there is no need to introduce an additional imaginary time, or Trotter, dimension, and the acceptance rate for transitions is comparable to that of classical lattice models. We find very good agreement between the DCM and the high temperature expansion in the temperature region where the high temperature expansion is valid, and reasonably good agreement at low temperatures with spin wave theory. The DCM fails for temperatures T < Tc which decreases with the size of the cell.

Determination of the velocity of short electromagnetic waves by interferometry

1952 ◽  
Vol 213 (1112) ◽  
pp. 123-141 ◽  
Keyword(s):  
Phase Velocity ◽  
Electromagnetic Radiation ◽  
Free Space ◽  
Electromagnetic Waves ◽  
Wave Beam ◽  
Wave Length ◽  
Wave Frequency ◽  
Space Wave

A new measurement of the velocity of electromagnetic radiation is described. The result has been obtained, using micro-waves at a frequency of 24005 Mc/s ( λ = 1∙25 cm), with a form of interferometer which enables the free-space wave-length to be evaluated. Since the micro-wave frequency can also be ascertained, phase velocity is calculated from the product of frequency and wave-length. The most important aspect of the experiment is the application to the measured wave-length of a correction which arises from diffraction of the micro-wave beam. This correction is new to interferometry and is discussed in detail. The result obtained for the velocity, reduced to vacuum conditions, is c 0 = 299792∙6 ± 0∙7 km/s.

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