scholarly journals Microscopic theory of dipole-exchange spin waves in ferromagnetic films: Linear and nonlinear processes

2000 ◽  
Vol 62 (10) ◽  
pp. 6545-6560 ◽  
Author(s):  
R. Costa Filho ◽  
M. Cottam ◽  
G. Farias
Keyword(s):  
Spin Waves ◽  
Microscopic Theory ◽  
Nonlinear Processes ◽  
Ferromagnetic Films ◽  
Linear And Nonlinear ◽  
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 Ferromagnetic Films

1970 ◽  
Vol 41 (3) ◽  
pp. 987-993 ◽  
Author(s):  
R. E. De Wames ◽  
T. Wolfram
Keyword(s):  
Spin Waves ◽  
Ferromagnetic Films ◽  
Dipole Exchange
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