The Phase Diagram and Exotic Magnetostrictive Behaviors in Spinel Oxide Co(FeAl)O System.

We report the magnetic and magnetostrictive behaviors of the pseudobinary ferrimagnetic spinel oxide system (1-)CoFeO-CoAlO [Co(FeAl)O], with one end-member being the ferrimagnetic CoFeO and the other end-member being CoAlO that is paramagnetic above 9.8 K. The temperature spectra of magnetization and magnetic susceptibility were employed to detect the magnetic transition temperatures and to determine the phase diagram of this system.