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 for bubble memory
From The Free On-line Dictionary of Computing (30 December 2018) :

  bubble memory
     A storage device built using materials such as gadolinium
     gallium garnet which are can be magnetised easily in only one
     direction.  A film of these materials can be created so that
     it is magnetisable in an up-down direction.  The magnetic
     fields tend to join together, some with the north pole facing
     up, some with the south.
     When a veritcal magnetic field is imposed on this, the areas
     in opposite alignment to the field shrink to circles, or
     'bubbles'.  A bubble can be formed by reversing the field in a
     small spot, and can be destroyed by increasing the field.
     Bubble memory is a kind of non-volatile storage but
     EEPROM, Flash Erasable Programmable Read-Only Memory and
     ferroelectric technologies, which are also non-volatile, are
     ["Great Microprocessors of the Past and Present", V 4.0.0,
     John Bayko , Appendix C]

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