Magnetic and structural properties of L11 type (Co 0.5Pt0.5)100-X-CX ordered alloy perpendicular films, fabricated on 2.5 inch size glass disks by sputter deposition, were examined as a function of C content, X. L11 type Co0.5Pt0.5-C polycrystalline films (10 nm thickness), with <111> axis (the easy axis) perpendicular to the film plane, were successfully fabricated even for a 30 vol% C content. Structural analysis indicated the segregation of C to the grain boundaries. Uniaxial magnetic anisotropy, Ku, of Co0.5Pt0.5 films without C addition was relatively low, about 1.5x107 erg/cm3 under the present deposition conditions. However, the addition of 5 vol.% C to Co-Pt films enhanced the ordering, resulting in an increase in Ku to around 2.5 x107 erg/cm3. A further increase in C content reduced Ku; however, Ku maintained a relatively large value of about 1.8x107 erg/cm3 even for a 20vol% C content, without degrading the easy axis orientation perpendicular to the film plane. Experimental results demonstrated the potential of the L11 type Co0.5Pt0.5-C films for use in granular media applications, due to their very high Ku, the relatively low fabrication temperature, and good controllability of the grain orientation.
ASJC Scopus subject areas
- Physics and Astronomy(all)