Early self-assembled stages in epitaxial SrRuO[sub 3] on LaAlO[sub 3]

Vasco, E.; Dittmann, R.; Karthäuser, S.; Waser, R.
April 2003
Applied Physics Letters;4/14/2003, Vol. 82 Issue 15, p2497
Academic Journal
The stress-induced self-assembled growth of SrRuO[sub 3] on LaAlO[sub 3] was studied by atomic force microscopy and x-ray diffraction. SrRuO[sub 3] epitaxially grown on LaAlO[sub 3] by pulsed laser deposition shows two types of out-of-plane arrangements and four in-plane matches. The lattice mismatch (stress) produced by these arrangements was estimated and correlated with the SrRuO[sub 3] growth dynamics. After 1 nm, the SrRuO[sub 3] film surface exhibits a ripple structure, which serves as a template for the development of a nanopattern of fiat islands. These islands coalesce anisotropically resulting in a regular array of "infinite" wires. The wire coalescence for the 12-20 nm thick film nullifies the surface symmetry, while SrRuO[sub 3] keeps growing in three dimensions.


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