Friedrich Heusler (* 1866; † 1947) was a German mining engineer and chemist. He discovered a special group of intermetallics now known as Heusler phases which are ferromagnetic though the constituting elements are not ferromagnetic. Intermetallics is concerned with all aspects of ordered chemical compounds between two or more metals and notably with their applications. ... A Heusler alloy is a ferromagnetic metal alloy based on a Heusler phase. ...

Reference:

F. Heusler: Verh. Deutsche Physikalische Gesellschaft 5 (1903), S. 219 ff.