Switching Resonance in Crystallites of Barium Titanate
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概要
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A model is proposed for oscillation of a 180°domain boundary in a crystallite of tetragonal barium titanate under the weak field of a waveguide. The boundary moves in steps which are reversed on its surface and which have only transient existence because they are below the critical size required for growth. The rate of reversal is calculated by determining the probability that a group of T.O. modes having wavelengths long enough to move a step as a unit will give its motion sufficient amplitude to carry it over the hump separating the two states of polarization. By a formal analogy between contributions of individual modes and the steps of a random walk, the transition probability is obtained as the probability that the walk yield a displacement of the required amplitude. Numerical estimates show that the model can explain the location and width of the microwave absorption maximum in polycrystalline barium titanate.
- 社団法人日本物理学会の論文
- 1966-09-05