Study of high magnetic anisotropy Co∕Pd multilayers for patterned media

We have studied the perpendicular magnetic anisotropy of Co∕Pd multilayers for ultrahigh recording density patterned media. By using Pt as an underlayer, the magnetic anisotropy enhances significantly, which is considered to be due to a magnetostriction by inducing a tensile strain into the Co∕Pd multilayers. A patterned medium using the Co∕Pd multilayers has been successfully fabricated with the diameter of the dots and the distance between the center of the dots measuring 20 and 30nm, respectively. The coercivity of the nanopatterned medium is 9.5kOe.