I saw a nice TEM image on this on a conference, but I can't find the reference. Do you know a paper that describes the effect of film stoichiometry on the interdiffusion and roughness?
That Mighty help you:
Tailoring magnetic interlayer coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices.
Ziese M, Vrejoiu I, Pippel E, Esquinazi P, Hesse D, Etz C, Henk J, Ernst A, Maznichenko IV, Hergert W, Mertig I.
Phys Rev Lett. 2010 Apr 23;104(16):167203. Epub 2010 Apr 21.
Thank you for this reference! It already helps. But I am still wondering how the interdiffusion would change if the A/B ratio of the perovskite was altered. As far as I remember it gives "bad" samples, so it's hard to find a reference.
Diffusion phenomeno is concentration dependent and therefore the interdiffusion coeffiicents change as a consequence of A into B or B into A. Normally when the interfacial roughness is low in the as deposited condition. as interdiffusion occurs, normally at high temperatures, there is a flux of atoms move across the interface causing a significant increase in the interface roughness.
Hi, you might find useful the following references:
PHYSICAL REVIEW B 77, 174409 2008
PHYSICAL REVIEW B 80, 155114 2009
PHYSICAL REVIEW B 77, 115103 2008
Actually the LMO/SMO superlattices have been studied in the past (cfr also PHYSICAL REVIEW B 66, 184426 2002 and APPl. PHYS LETT 79, 13 2001), but samples are not always of optimal quality. Usually the LMO/STO heterostructure is preferred (see also Probing Interfacial Electronic Structures in Atomic Layer LaMnO3 and SrTiO3 Superlattices by Shah et al. Adv Mat 2010).
I suspect that diffusion will be easier for compositions that differ from the stoichiometry (this is a general trend in ordered phases in which mobility is generaly small compared to random solid solutions). We can therefore imagine that rougthness will increase for increasing departure from the ideal stoichiometry.
That is what I remember and it definitely makes sense. But I could not find a reference that clearly shows that, i.e. a series of superlattices or interfaces where the stoichiometry is varied in a controlled way and the results are examined and compared.
This ref might help you, Growth and magnetoresistive properties of LaMnO3/SrMnO3 superlattices, APl 75 2638 (1999) where super lattice period was kept same (stoichiometry) and the thickness varied.
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