Giant coercivity nanodots and fractals in CoPt films grown on (001) SrTiO3 using pulsed laser deposition

RK Rakshit, SK Bose, R Sharma, RC Budhani - Applied physics letters, 2006 - pubs.aip.org
High coercivity nanoscale structures of CoPt are grown on (001) Si Ti O 3 with pulsed laser
ablation. At low growth rate (≃ 0.4 Å∕ s)⁠, the film morphology changes from a self-similar
fractal to nanodots as the deposition temperature is raised from 700 to 800 C⁠. While the
nanodots are L 1 0 ordered phase with out-of-plane c axis and coercivity H c⊥≃ 30 kOe⁠,
the fractals have a nonzero, in-plane c-axis component of the L 1 0 phase. The large lattice
mismatch between (001) Sr Ti O 3 and the ac∕ bc plane of L 1 0 imparts tensile strain to the …
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