Magnetoelastic coupling constants in epitaxial Co80Pt20 films

Abstract

Magnetoelastic coupling constants in epitaxial hcp Co80Pt20 films with (101̄0) orientation (a axis and c axis in plane) have been measured. A magnetostrictive stress tester with magnetic field up to 18 kOe was constructed based on the bending cantilever technique. The magnetoelastic coupling constants were directly extracted from the magnetostrictive stress data and no information on the mechanical properties of the Co80Pt20 film is needed. The magnetoelastic coupling constants along the a and c axes were B1′=15×106 and B2′=−80×106 erg/cc, respectively, which are much smaller than those of pure Co.