A measuring system is described which is capable of rapidly analyzing dynamic ac domain wall displacements monitored by Faraday photometric signals from bubble materials placed in a polarizing microscope. An audio modulated rf drive field used in conjunction with signal processing electronics produces a signal proportional to the derivativedx/dhₚof the displacement amplitude with respect to the peak drive field. This signal is the basis of plots produced automatically ofdx/dhₚversus frequency (10 kHz - 32 MHz),dx/dhₚversus hp, andxversus hp. Data obtained on an epitaxial garnet film of Eu0.7Y2.3Fe3.85Ga1.15O12are presented showing domain wall resonances and nonlinearities between wall velocity and drive field.
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Argyle et al. (1973) studied this question.
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