CaRuO3 thin films were synthesized on SrTiO3 substrates by pulsed laser deposition. Detailed microstructure analysis by transmission electron microscopy revealed the pseudoheterostructure in CaRuO3 films. It consists of a coherently strained cubic CaRuO3 layer contacted with substrate, as well as a strained orthorhombic CaRuO3layer. The orthorhombic CaRuO3layer is composed of two types of domains. The ferromagnetic property of the pseudoheterostructure CaRuO3was revealed by superconducting quantum interference device measurement. This is due to the cubic CaRuO3layer, which is supported by first-principle calculations. The formation mechanism of pseudoheterostructure in ultrathin CaRuO3thin films was proposed.
This paper is published on APL.
Link to the full text: http://apl.aip.org/resource/1/applab/v96/i18/p182502_s1
4 May, 2010