That was commercialized (and, wow, btw) to some extent in the 1970s and early 1980s. I remember a bubble memory expansion card for the Apple II, basically the same advantage (the zeroes and ones stayed put when power went off), but wound up a niche product for demanding environments, usually industrial ones. The dynamic RAM density started climbing, prices fell like crazy, and bubble memory pretty much vanished.
Thanks for that update. I recall when the possibility of bubble memory was put forward, but I don’t recall anything else about it. So thanks for filling up my “memory hole!”
Best,
Doc