Investigations of the structural and magnetic properties of thin Co 50-xNixPt50 (x = 0, 10, 15, 37.5) films and fabrication of magnetic tunnel junctions (MTJs) using Co50Pt 50 and Co35Ni15Pt50 electrodes were performed. X-ray diffraction analyses revealed that 20-nm-thick CoPt and CoNiPt films were epitaxially grown with (001)-orientation with an L1 0-chemical order parameter of 0.66-0.82. CoNiPt with various Ni contents magnetized perpendicularly; the saturation magnetization reduced to 157 emu/cm3 when the Ni content was increased to 37.5%. Magnetotransport measurements under a magnetic field applied perpendicular to the film plane revealed a tunnel magnetoresistance ratio of 10% and 1% at 10 K and 300 K, respectively, for MTJ using Co35Ni15Pt50 electrodes.
ASJC Scopus subject areas
- Physics and Astronomy(all)