It’s a good candidate since it sounds like there’s no precision mechanical components like there would be in a hard drive. Does anyone have ideas for how I’d go about this? Is there a barrier I’m not considering?
I know how to make basic semiconductors already, so that’s not an issue.
Edit: I’ve got an answer written down in the comments now. TL;DR you’d still need lithography to do it the OG way, because of the patterned magnetic material that directed bubbles around the medium, but material requirements are actually pretty flexible.
Just from a quick Google search, it looks like it’s similar to tape memory, except the data moves along the tape, instead of the tape moving over the reading head. According to
diagram by TI, it looks like the bubbles are on some iron wafer and forcibly moved around by two coils. Then, on a second substrate there are some type of read & write head.
So here’s how I would go about this: first, I’d wrap some small metal plates in insulated magnet wire, place two permanent magnets on the top and bottom (sandwich style) and stick a read head on the edge of the plate. Then you push AC current through the two coils offset by 90 degrees. This should push the bubble in a circle, and that can be read by the tape head.
Keep in mind though, this is a complete guess based on a simplified diagram from the 70s. I don’t actually know if this is how they work.