Domain wall oscillations in magnetic garnet films

High-Frequency Modulation and Deflection of Light by Oscillating Domain Lattices

“…The dependence of p on B , is nearly linear. This result shows that a small collapse induction BY1' is essential to achieve a large variation A p and thus a large modulation amplitude IFA according to (5).…”

“…All modulation amplitudes vanish at p = 0.5 according to (5). However, using the diffraction order k = 0, measurements can be carried out in this case by rotating the analyzer off the position perpendicular to the polarization of the incident light.…”

“…The dependence of the wall mass m on the in-plane induction is approximately [5] n12 ._, - A kinetic energy term has been added to the static energy term of the wall energy. N , denotes the demagnetizing factor of a single domain in the y-direction.…”

“…Thus the diffraction angles and the diffraction intensities can be controlled in this way. If in addition an rf induction is applied along the film normal the domain lattice oscillation can be excited [5]. In t b s case the difiacted light is modulated at the lattice resonance frequency which can be tuned ') Barbarastr.…”

“…To calculate the domain lattice resonance two models are considered which are approximations for Q & 1. At first the model of [5] is used that yields an analytical expression for the resonance frequency which is given by where rn is the effective wall mass per unit area and F the density of the total free energy containing the wall energy and the demagnetizing energy. While the cubic anisotropy is neglected, the uniaxial anisotropy energy and the Zeeman energy are taken into account as follows.…”