Surface Torques and Their Effects on the Boundary Parameters in Ferromagnetic Insulator Thin Films.
Abstract
The analysis of the spin wave spectrum in a magnetic insulator thin film is dependent on the characterization of the interactions occurring at the surfaces of the film. From the characterization of the surfaces a model was developed that describes the behavior of the spin wave spectrum. Angular variation and frequency dependence of the boundary parameter were investigated in single crystal LPE and CVD thin films of Yttrium Iron Garnet. A uniaxial surface anisotropy energy that produces "NonParallel" ground states with the spins near the surface aligning at angles canted to the bulk spin direction is described. This "NonParallel" ground state predicts a frequency dependence and an angle dependence in the boundary parameter. Calculations are made of the magnitudes of the unixial surface anistropy energy and the isotropic boundary parameter.
 Publication:

Ph.D. Thesis
 Pub Date:
 1978
 Bibcode:
 1978PhDT........83S
 Keywords:

 Physics: Condensed Matter;
 Boundary Layers;
 Ferromagnetic Films;
 Magnons;
 Spectrum Analysis;
 Surface Reactions;
 Thin Films;
 Torque;
 Angles (Geometry);
 Data Processing;
 Frequencies;
 Ground State;
 Interfaces;
 Mathematical Models;
 Parameterization;
 Surface Energy;
 Surface Waves;
 YttriumIron Garnet;
 SolidState Physics