Electrodeposition of (001) oriented CoPt L1[sub 0] columns into anodic alumina films

Yasui, N.; Imada, A.; Den, T.
October 2003
Applied Physics Letters;10/20/2003, Vol. 83 Issue 16, p3347
Academic Journal
Anodic alumina films are known to have perpendicular holes normal to the film surface. This character is favorable to perpendicular magnetic recording and patterned media. L1[sub 0]-ordered CoPt columns are filled into anodic alumina nanoholes by an electrodeposition method and a subsequent thermal annealing process. Two kinds of metal (W and Pt) were used as underlayers at the bottom of nanoholes, which acts as electrode layer for electrodeposition. We show that while the embedded L1[sub 0]-ordered CoPt columns have random c-axis orientations for W underlayer samples, the c-axis orientation can be controlled by using the underlayer with Pt(001) surface. This orientation controlled sample has a perpendicular anisotropy with H[sub c]=7.4 kOe, and M[sub r]/M[sub s]=0.96. This approach has the potential to become one of the important methods for the fabrication of recording media with ultrahigh areal density. © 2003 American Institute of Physics.


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