That is a good point, because the way I was taught it is that ferromagnetism is one of the few purely quantum mechanical phenomena we see in everyday life. How

That is a good point, because the way I was taught it is that ferromagnetism is one of the few purely quantum mechanical phenomena we see in everyday life. However, people don't really refer to it as "quantum matter". I think you could argue that people have had some sort of heuristic description since long before quantum was known about.