Effects of B and C on the ordering of L1[sub 0]-CoPt thin films

Yamaguchi, H.; Kitakami, O.; Okamoto, S.; Shimada, Y.; Oikawa, K.; Fukamichi, K.
September 2001
Applied Physics Letters;9/24/2001, Vol. 79 Issue 13
Academic Journal
We have investigated the effects of B and C on the ordering of L1[sub 0]-CoPt films and confirmed the following quite different role between B and C in CoPt. A small amount of B considerably decreases the temperature for ordering and is interstitially incorporated into L1[sub 0]-CoPt along its c axis due to the large negative heat of solutions with Co and Pt. X-ray photoelectron spectroscopy analyses have revealed that B atoms combine with Co and Pt. In contrast, C is not incorporated into the CoPt lattice due to its positive heat of solution, resulting in no decrease in the ordering temperature. The present results reveal that CoPt films containing a small amount of B are promising for high density recording media. © 2001 American Institute of Physics.


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