Magnetic Coupling in La0.7Sr0.3MnO3 / SrRuO3 Superlattices

The superlattice consisting of ferromagnetic constituents La0.7Sr0.3MnO3 (LSMO) and SrRuO3 (SRO) exhibits several interesting functionalities like antiferromagnetic coupling [1-3], magnetocaloric effect [4], magnetoresistance [5] etc.. Though there are several explanations for these physical properties, we have reported that these properties are controlled by the crystal structure of LSMO layer in LSMO/SRO superlattices [2].Interestingly, magnetic measurements of superlattices with thicker SRO layer than LSMO reveal several features including reduced magnetization, enhanced coercive field, antiferromagnetic couplingand the switching of magnetic coupling from antiferromagnetic to ferromagnetic with orientations of magnetic field from in-plane to out-of-plane [2].In addition, ultrathin layers of LSMO/SRO superlattices grown on (001)-orientation LaAlO3 (LAO) substrates showed reduced TCand absence of antiferromagnetic coupling compared to that of the simultaneously grown superlattices on STOsubstrates [6]. These properties are discussed using x-ray diffraction and Raman spectroscopy measurements. 

References
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