Magnetic properties of some metastable Co-Ru alloys studied by ion beam mixing and ab initio calculation

摘要

Magnetic fcc-Co_(75)Ru_(25) (L1_2) phase and nonmagnetic fcc-Co_(25)Ru_(75) (L1_2) phase are obtained by ion beam mixing in the respective Co-Ru multilayered films. Interestingly, in the Co_(50)Ru_(50) multilayered films, a magnetic dual-fcc phase, identified to be a mixture consisting of a magnetic fcc-Co_(75)Ru_(25) and a nonmagnetic fcc-Co_(75)Ru_(25) phases, is observed at an irradiation dose of 3 × 10~(15) Xe~+/cm~2 and, upon further irradiation to a dose of 7 ×10~(15) Xe~+/cm~2, transformed into a nonmagnetic single-fcc phase with an alloy composition back to be Co_(50)Ru_(50).