Transverse spin waves in normal and superfluid 3He

1987 ◽  
Vol 65 (11) ◽  
pp. 1330-1335 ◽  
Author(s):  
D. Candela ◽  
D. O. Edwards ◽  
A. Heff ◽  
N. Masuhara ◽  
D. S. Sherrill ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Spin Wave ◽  
Fermi Liquid ◽  
Spin Waves ◽  
Wave Spectrum ◽  
Superfluid 3He ◽  
Transverse Spin ◽  
Published Data ◽  
Normal Liquid ◽  
Spin Wave Spectrum

After a brief review of experiment and theory for transverse spin waves in normal liquid 3He, we compare previously published data at 0, 6.3, and 12.3 bar (1 bar = 100 kPa) in superfluid 3He–B with a new version of the theory of Combescot for the spin-wave spectrum. The new theory includes the Fermi-liquid parameters [Formula: see text] and [Formula: see text] (as well as [Formula: see text], which was in the old version). The equations give an excellent fit to the data at 0 bar using values of [Formula: see text] and [Formula: see text] from the normal liquid, and [Formula: see text] from the B-phase susceptibility. At 6.3 bar, the fit is not quite so good, perhaps because of nontrivial strong-coupling effects. At 12.3 bar, the experimental uncertainties make the comparison inconclusive.

Spin Waves in Multilayers with Different Magnitudes of the Magnetization, Exchange, and Anisotropy

2012 ◽  
Vol 190 ◽  
pp. 71-74 ◽  
Author(s):  
V.A. Ignatchenko ◽  
D.S. Tsikalov
Keyword(s):  
Spin Wave ◽  
Spin Waves ◽  
Wave Spectrum ◽  
Band Gaps ◽  
Sinusoidal Modulation ◽  
One Dimensional ◽  
Material Parameters ◽  
Magnetic Parameters ◽  
The Difference ◽  
Spin Wave Spectrum

The spin-wave spectrum in one-dimensional magnon crystals periodic superlattices (SLs) is investigated for the rectangular and sinusoidal modulation profile of the material parameters. The dependences of band gaps in the spectrum on both the difference of the magnetic parameters in adjacent layers and the ratio of the layer thicknesses are calculated.

VORTICITY AND ANTIVORTICITY IN SUBMICRON FERROMAGNETIC FILMS

2007 ◽  
Vol 21 (13n14) ◽  
pp. 2289-2300 ◽  
Author(s):  
HAO WANG ◽  
M. YAN ◽  
C. E. CAMPBELL
Keyword(s):  
Spin Wave ◽  
Spin Waves ◽  
Wave Spectrum ◽  
Simulation Methods ◽  
The Core ◽  
Ferromagnetic Films ◽  
Spin Wave Spectrum

The existence of stable or metastable vortex and antivortex states in submicron ferromagnetic films is reviewed. Using standard simulation methods, the dynamics of an antivortex in a permalloy asteroid geometry is explored. As in the case of the vortex in similarly sized permalloy disks and squares, there is a sub-GHz frequency gyrotropic mode of the core of the antivortices, and a rich spin wave spectrum in the multi-GHz range. The spin waves are generated in the simulations by using magnetic pulses similar to those available experimentally, which have been applied to circular and square particles of similar sizes in previous research.

scholarly journals Magnonic band spectrum of spin waves in an elliptical helix

2018 ◽  
Vol 5 (1) ◽  
pp. 172285 ◽  
Author(s):  
A. V. Golovchan ◽  
V. V. Kruglyak ◽  
V. S. Tkachenko ◽  
A. N. Kuchko
Keyword(s):  
Perturbation Theory ◽  
Band Gap ◽  
Spin Wave ◽  
Spin Waves ◽  
Wave Spectrum ◽  
Three Dimensional ◽  
Band Spectrum ◽  
Square Root ◽  
Structural Elements ◽  
Spin Wave Spectrum

We show that the spin-wave spectrum in an elliptical helix has a band character. The size of the first band gap calculated using the perturbation theory is shown to scale as square root of the eccentricity. Curved magnonic waveguides of the kind considered here could be used as structural elements of future three-dimensional magnonic architectures.

Spin-Wave Spectrum in the Sinusoidal Superlattice with Amplitude and Phase Inhomogeneities

2014 ◽  
Vol 215 ◽  
pp. 385-388
Author(s):  
Valter A. Ignatchenko ◽  
Denis S. Tsikalov
Keyword(s):  
Spin Wave ◽  
Density Of States ◽  
Wave Spectrum ◽  
The Self ◽  
One Dimensional ◽  
Consistent Approximation ◽  
Self Consistent ◽  
Greens Function ◽  
The One ◽  
Spin Wave Spectrum

Effects of both the phase and the amplitude inhomogeneities of different dimensionalities on the Greens function and on the one-dimensional density of states of spin waves in the sinusoidal superlattice have been studied. Processes of multiple scattering of waves from inhomogeneities have been taken into account in the self-consistent approximation.

Sign in / Sign up

Export Citation Format

Share Document