Electronic measurement of bubble stretch-out velocity on a chevron detector

A direct measurement of bubble stretch-out velocity on a chevron detector can be performed by studying the detector signal as a function of the number of periods over which stretch-out has taken place. For about a 10% range of bias field, a long stretched out domain will shrink into a bubble without popping when the rotating field is turned off. When the rotating field is turned back on, the bubble will expand and will give a detector signal proportional to its stretched out length. A velocity can be calculated from the rate, of detector signal increase per number of chevron periods allowed for expansion. The stretch-out velocity is related to drive and bias field amplitude. An estimate of domain mobility can be made by fitting to a simple model experimental velocity dependence on drive and bias fields. Data from three different garnet materials with stretch-out velocities between 2000 and 5800 cm/s at 35 Oersted peak triangular drive show that meaningful comparisons between different materials can be made.