The grain size and grain-size distribution of sputtered L 10 Fe50 Pt50 (300 Å thick, composition in at. %) magnetic thin films on Cu (001) single-crystal substrate were investigated using high-resolution transmission electron microscopy (HRTEM). The planar TEM results showed that the grain size was about 56 Å in diameter with a standard deviation of ~10%. The cross-sectioned TEM images indicated that the magnetic grains existed in columnar structures. The L 10 -ordered FePt films with a small grain size and narrow grain-size distribution are potential media candidates for the high-areal density magnetic recording.
Bibliographical noteFunding Information:
One of the authors (G.M.C.) thanks the support of this work by the NUS Academic Research Grant and the Office of Naval Research, USA. The authors thank Y. F. Ding for assistance with TEM sample preparation.