CONTROL METHOD OF MAGNETIC BUBBLE STEADY EXISTENCE MAGNETIC FIELD FOR MAGNETIC BUBBLE MEMORY ELEMENT

摘要

PURPOSE:To ensure the control for the magnetic bubble steady existence magnetic field in a simple method and thus to increase the yield by giving the thermal treatment to the chip in which the ion implanting is given to the garnet film for bubble. CONSTITUTION:A thermal treatment of 200-500 deg.C is given to the chip into which the ion of Ne or the like is implanted to suppress the hard bubble of the magnetic bubble element. The collapse magnetic field where the steady existence is ensured for the bubble can be controlled accurately just by controlling the temperature and time of the thermal treatment. As a result, the nondefective and usable chips can be obtained through the thermal treatment among those which are hitherto decided defective at the growing stage of the crystal for the bubble material, thus increasing the yield at the material growing stage. Furthermore, the dispersion of the collapse magnetic field can be made even between chips by controlling the temperature of the thermal treatment, and as a result the active margin of the element can be increased.