Effective Mass of 180℃ Domain Wall in Single Crystal Barium Titanate

概要

論文の詳細を見る
A model is advanced for sidewise displacement of a 180° domain wall in single crystal barium titanate under field 〓 1kV. Nuclei of reversed polarization formed at the base grow and cover the wall with a population ν_i of steps of size i. Kinetic equations are written for ∂_<νi>/∂t which show how a weak oscillating field component will perturb the ν_i, enhancing susceptibility. Into these kinetic equations are substituted forces ∂S/∂_<νi>, with configurational entropy S calculated from the number of ways of stacking the steps. This substitution puts the rate equations in canonical form, to which Onsager-Casimir reciprocity relations may be applied, yielding free energy terms quadratic in ∂_<νi>/∂t. These terms determine wall inertia and possible coupling of wall motion to dielectric relaxation. For steady state wall velocity υ, one free energy term has the form 1/2m_uυ^2, giving an expression for effective mass m_w.
社団法人日本物理学会の論文
1967-06-05