Two series of perpendicular exchange coupled composites (ECC) films are prepared by dc magnetron sputtering, FePt(5)/[Co(0.2)/Pt(0.3)] N (ECC-I-N) and FePt(5)/[Co(0.2)/Pt(0.6)] N (ECC-II-N), respectively. Structure analyses reveal the epitaxial growth on (001) oriented L1 0 FePt island-like grains of [Co/Pt] N with (200) orientation. Coercivity H C and remanent coercivity H CR of both series samples decrease sharply compared to FePt, with the increase of the thickness of [Co/Pt] N. The angular dependence of H CR shows excellent angular tolerance.
Bibliographical noteFunding Information:
This work is partially supported by the NSF of China (Grant Nos. 51071046, 61078030, 11074046, 11174056, and 51171047), the National Basic Research Program of China (2009CB929201), and the Characterization Facility, University of Minnesota, a member of the NSF-funded Materials Research Facilities Network (www.mrfn.org) via the NSF MRSEC program under Award No. DMR-0819885.