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Perovskite-type manganites, which are well-known for their intriguingphysical properties such as colossal magnetoresistance (CMR) and halfmetalicity, have been considered as candidate materials for spintronics.However, their ferromagnetic (FM) properties are often suppressed in thin filmswhen the thickness is reduced down to several monolayers (MLs). In order toinvestigate how the magnetic phases evolve near the paramagnetic (PM)-to-FMphase transition boundary, we have performed temperature-dependent x-raymagnetic circular dichroism (XMCD) experiments on a La$_{1-x}$Sr$_{x}$MnO$_3$(LSMO, $x=0.4$) thin film, whose thickness (8 ML) is close to the boundarybetween the FM-metallic and the PM-insulating phases. By utilizing theelement-selectiveness of XMCD, we have quantitatively estimated the fractionsof the PM and superparamagnetic (SPM) phases as well as the FM one as afunction of temperature. The results can be reasonably described based on amicroscopic phase-separation model.

proceedings of the international conference on strongly correlated electron systems (sces2019)

Temperature evolution of magnetic phases near the thickness-dependent  metal-insulator transition in La$_{1-x}$Sr$_x$MnO$_3$ thin films observed by  XMCD