Misfit relaxation of La0.7Sr0.3MnO3 thin films by a nanodot segregation mechanism

作者：Abellan P; Moreno C; Sandiumenge F^*; Obradors X; Casanove M J

来源：Applied Physics Letters, 2011, 98(4): 041903.

DOI：10.1063/1.3549182

Partially segregated La0.7Sr0.3MnO3 (LSMO) nanocomposite films are shown to exhibit a thickness dependent self-assembled structure. The morphological evolution of the nanocomposite and the misfit strain of the LSMO phase are linked through the topological distribution of La-Sr oxide nanodots within the film. Misfit relaxation occurs above a critical thickness, h(c), coinciding with the nucleation of La-Sr oxide nanodots at the film-substrate interface. Below h(c), the same dots outcrop the film surface, forming islands. As a consequence of this misfit relaxation mechanism, an enhancement in the magnetoresistance with increasing thickness is measured.

• 出版日期2011-1-24