Interesting that Gadolinium was used in bubble memory as well: "Gadolinium gallium garnet ... was used for imitation diamonds and for computer bubble memory."[1

Interesting that Gadolinium was used in bubble memory as well: "Gadolinium gallium garnet ... was used for imitation diamonds and for computer bubble memory."[1] 1: https://en.wikipedia.org/wiki/Gadolinium#Applications https://en.wikipedia.org/wiki/Gadolinium#Applications