• Bernal-Salamanca, M.; Konstantinovic, Z.; Balcells, L.; Scepanovic, M.; Valencia, S.; Pannunzio-Miner, E.; Frontera, C.; Pomar, A.; Martínez, B.: Fractal polymer islands on top of ferromagnetic La2Ni0.6Mn1.4O6 thin films. Journal of Magnetism and Magnetic Materials 537 (2021), p. 168203/1-5

10.1016/j.jmmm.2021.168203

Abstract:
The formation of the crystalline organic polymer (OP) islands on top of double perovskite ferromagnetic La2Ni1–xMn1+xO6 (x = 0.4) thin films by RF sputtering is reported. The presence of randomly ramified organic polymer islands for film grown on top of SrTiO3 and LaAlO3 substrates suggest the fractal growth. The stability of fractal OP islands is tested by an in-situ oxygen annealing process as function of the annealing temperature. The evolution of the fractal structure of OP islands is followed in parallel with the evolution of structural and magnetic properties of LNMO thin films. The modification of the manganese valence state due to the presence of organic polymer fractals is studied by means of X-ray photoemission microscopy.