New approach for measuring bubble collapse field of LPE garnet layers

Abstract

A new method based on the superposition of a sinusoidally varying alternating field with increasing amplitude on the constant bias magnetic field normal to the plane of an LPE garnet film is proposed for precise, objective photoelectrical determination of the bubble collapse field. The method avoids subjective errors in the determination of the collapse field, it gives information on hard bubbles, and for serial measurements it can even be implemented without a measuring microscope.