Dynamic Bubble Array Technique to Detect Defects

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Abstract
A new technique for staining and characterizing magnetic defects in bubble domain materials is described and illustrated. A plurality of bubble domains is caused either to flow without turbulence or to be excited into random motion by a continuous train of magnetic field pulses having suitable geometry, pulse width, pulse amplitude and period. Time averages of bubble positions visible by eye or with photomicrographs using Faraday contrast reveal the positions of any magnetically active defects. These are stained according to the pattern of flow and/or the trapping times indicated by spatial variations in light intensity. The staining pattern reveals information about the defect‐to‐bubble interaction, e.g. repulsive vs attractive, wall trapping vs bubble trapping, and relative strengths of the interaction.

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