[Cheakster]

Hello everyone.  I am fascinated by ferrofluid.  My question is there a compound that can become a true solid when a magnetic field is applied to it?  Maybe someone can point me in the direction of some good literature to read about the topic?  (Articles/books, etc with math is ok)

Disclaimer: I am not a chemist, but a software engineer by trade, but I like all kinds of science... so try to not to rip me to hard if there is an obvious answer.

Thanks everyone