In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Substances exhibiting it can be analyzed by polishing the surface with an appropriate colloidal suspension, producing Bitter patterns. These patterns provide evidence for the "domain" theory explaining this property, as does the Barkhausen effect, which holds that it increases in a series of minute jumps as the applied magnetic field is increased. Occurring below the Curie point, FTP, what is this property seen in elements like cobalt, nickel, and iron, in which substances are magnetized by weak magnetic fields
Science