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We studied ZrO2-La2/3Sr1/3MnO3 pillar matrix thin films which were found toshow anomalous magnetic and electron transport properties controlled by theamount of ZrO2. With the application of an aberration corrected transmissionelectron microscope, structure and chemical information of the system,especially of the pillar matrix interface were revealed at atomic resolution.Minor amounts of Zr were found to occupy Mn positions within the matrix and itssolubility within the matrix was found to be less than 6 mol%. Moreover, the Zrconcentration reached minimum concentration at the pillar matrix interfaceaccompanied by oxygen deficiency. La and Mn diffusion into the pillar wasobserved along with a change of the Mn valence state. La and Mn positionsinside ZrO2 pillars were also revealed at atomic resolution. These resultsprovide detailed information for future studies of macroscopic properties ofthese materials.

Atomic-resolution TEM Studies of Pillar-Matrix Structures in Epitaxially Grown Ultrathin ZrO2-La2/3Sr1/3MnO3 Films