Some temperature characteristics of a bubble memory

A 28-μm period, all chevron bubble memory using 6-μm diameter domains in Y1.32Sm.38Lu.38Ca.92Fe4.08Ge.92O12was operated at 100 kHz from -45° to +100°C with suitably chosen pulse and drive field amplitudes. At high drive currents the minimum all-function bias range among 4 accessible storage loops in the major-track, minor loop organized memory increased from 12G at -45°C to 17G for a broad maximum about room temperature and then decreased to 6G at 100°C. The behavior of bias margins with temperature and drive-current amplitude is shown. The stretch, cut, and annihilation-pulse operating ranges decrease with increasing temperature. Delay tolerances for the annihilation and cut pulses are shown as a function of the temperature.