The Transition from Nonmagnetic State to Ferromagnetic State of Co in a Pseudobinary Alloy CoTi_1-<i>x</i>Al_<i>x</i>

Abstract

The coexistence of ferromagnetic and nonmagnetic Co is found in a pseudobinary alloy CoTi 1- x Al x by means of magnetization measurement and NMR of Co 59 . The dependence of the component of the ferromagnetic Co on external field and on composition x result in a critical field H c and a critical composition x c where the magnetic state of Co in the alloy takes place transition from nonmagnetic state to ferromagnetic one or vice versa . The nonmagnetic state of Co at x =0.6 is identified with the strongly paramagnetic and exchange enhanced state with Stoner factor of 24.