Ultra-thin FePd films were prepared by the sputter-deposition of Fe and Pd layers. After annealing at 500°C, they transformed to a (001) oriented L10 ordered phase from an A1 disordered phase and changed their anisotropy to perpendicular magnetic anisotropy from in-plane. The ordered parameter was about 0.7 for all thicknesses of the FePd films. The 20nm-thick FePd film exhibited the squareness of 0.3 because both the disordered phase with in-plane magnetic anisotropy and ordered phase with perpendicular magnetic anisotropy existed in the FePd film. The disordered phase was reduced, and the L10 phase became predominated as the thickness of the FePd films decreased. In particular, when the FePd films were 3 and 5nm thick, the squareness became unity while maintaining a thermal stability factor of over 60. The uniaxial magnetic anisotropy constant Ku was over 1×107erg/cm3. Those characters make ultra-thin L10 FePd films suitable for use in nano-devices for magnetic applications.
Bibliographical noteFunding Information:
This research was supported in part by the industry-university cooperation project of the SK Hynix Semiconductor Inc., and by the Basic Science Research Program (2012-009406) and the Pioneer Research Center Program (2012-0001087) funded by the Ministry of Education, Science and Technology in Korea.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)