This site from the Georgia State University contains a good overview of some of the magnetic properties that are common to all materials, such as susceptibility and permeability, and then specific discussion of both diamagnetic and...

This Wikipedia site is an introduction to paramagnetism and paramagnetic materials.

This site from the Georgia State University provides a brief introduction to paramagnetism, explaining how paramagnetic materials exhibit magnetization proportional to an applied magnetic field according to Curie's law.