scholarly journals Controlling the propagation of dipole-exchange spin waves using local inhomogeneity of the anisotropy

2020 ◽  
Vol 102 (1) ◽  
Author(s):  
Morteza Mohseni ◽  
Burkard Hillebrands ◽  
Philipp Pirro ◽  
Mikhail Kostylev
Keyword(s):  
Spin Waves ◽  
Local Inhomogeneity ◽  
Dipole Exchange

Observation of parametric amplification of propagating dipole-exchange spin waves in yttrium iron garnet films

JETP Letters ◽  
1996 ◽  
Vol 64 (3) ◽  
pp. 171-176 ◽  
Author(s):  
B. A. Kalinikos ◽  
N. G. Kovshikov ◽  
M. P. Kostylev ◽  
H. Benner
Keyword(s):  
Yttrium Iron Garnet ◽  
Spin Waves ◽  
Parametric Amplification ◽  
Yttrium Iron ◽  
Garnet Films ◽  
Iron Garnet ◽  
Dipole Exchange

DIPOLE-EXCHANGE SPIN WAVES IN FERROMAGNETIC NANOSTRUCTURES WITH SPHERICAL GEOMETRIES

2008 ◽  
Vol 15 (06) ◽  
pp. 727-744 ◽  
Author(s):  
HOA T. NGUYEN ◽  
M. G. COTTAM
Keyword(s):  
Function Theory ◽  
Spin Waves ◽  
Microscopic Theory ◽  
Particle Sizes ◽  
Spin Hamiltonian ◽  
Spherical Shells ◽  
Dipole Interactions ◽  
Ferromagnetic Nanostructures ◽  
Dipole Exchange ◽  
Spectral Intensities

Dipole–exchange spin waves (SWs) are studied in ferromagnetic nanostructures with spherical geometries such as spheres, part spheres, and spherical shells, both individually and in finite-sized arrays. A microscopic theory is used based on a spin Hamiltonian, which incorporates the short-range exchange and long-range magnetic dipole–dipole interactions, as well as an external magnetic field applied in any direction. Our theory is advantageous for describing the dynamical properties of inhomogeneously magnetized samples, and the use of phenomenological boundary conditions is avoided. Numerical results are deduced for the frequencies of the discrete SW modes and their dependence on the radius, spacing between particles, applied field, etc. Applications are made to Permalloy Fe 19 Ni 81 and alloy Co 80 Ni 20 nanoparticles with their sizes varying from 10 to 100 nm. Through a Green function theory, the spatial distributions and spectral intensities of the SWs are also deduced. The mode-mixing (hybridization) effects on the SW branches are found to be important, depending on the particle sizes and geometries.

Dipole-exchange spin waves in magnetic thin films at zero and finite temperature: Theory and simulations

2011 ◽  
Vol 83 (17) ◽  
Author(s):  
E. Meloche ◽  
J. I. Mercer ◽  
J. P. Whitehead ◽  
T. M. Nguyen ◽  
M. L. Plumer
Keyword(s):  
Thin Films ◽  
Finite Temperature ◽  
Spin Waves ◽  
Magnetic Thin Films ◽  
Dipole Exchange
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