[Animats]

This is so bad it's not even clear what they are spinning. Is this a memory device? A compute element? What?

Physicists have been fooling around with yttrium iron garnet for decades.[1][2] It apparently has really weird interactions between photons and magnetic fields. That's promising, because semiconductors came from studying weird interactions between electric charge and current flow in unusual solid materials. Yttrium iron garnet been tried experimentally for microwave phase-shifters and beam-forming antennas, but doesn't seem to have appeared in products yet.

So, decades of papers, but no products yet. There's real physics there, but the hype is overblown. Probably because someone needs funding and grad students to work in this obscure area.

[1] https://www.sciencedirect.com/topics/physics-and-astronomy/y...

[2] https://www.nature.com/articles/s41535-017-0067-y.pdf