Interfacial strain measurements ofSrRuO3∕SrMnO3magnetic multilayers

Abstract

Magnetic multilayers of (SrRuO 3 ) m (SrM nO 3 ) n were grown artificially using the pulsed laser deposition technique on (001)-oriented SrT iO 3 substrates.The state of strain at the interfaces and the structural coherency are studied in details utilizing asymmetrical X-ray diffraction and the sin 2 ψ method.First, the evolution of the lattice parameters, the crystallinity and the epitaxy of the films are evaluated as a function of the number of SrM nO 3 unit cells using X-rays diffraction and transmission electron microscopy. Second, our results on the stress indicate that the SrRuO 3 /SrM nO 3 superlattices show a larger residual strain as compared to the single layer film of SrRuO 3 . This suggests that the lattice stiffening from interfacial strain and inhibiting the dislocation by composition modulation. Finally, these results bring insights on the interfacial stress measurements of oxide multilayers that can be used to control the physical properties at the level of the atomic scale. * prellier@ismra.fr

Effect of strain on the electrical transport and magnetization of the epitaxialPr0.5Ca0.5MnO3∕La

“…The observed negligibly small changes in the low field moments at low temperature and the increase in the paramagnetic moments with LCMO layer thickness could be due to the C-type CO state of the constituents. The well defined Curie temperature and H C of the trilayer on LAO is due to the formation of the magnetic domain at the interfaces which is evidenced from ZFC/FC magnetic properties of the multilayer structure that have more interfaces [10]. The magnetization of the trilayer on STO and LAO increases gradually with the increase in magnetic field and does not show a clear saturation.…”

“…In our earlier studies, we have found the evidence of ferromagnetic phase and the enhanced coercive field in the superlattices consisting of two antiferromagnets La 0.5 Ca 0.5 MnO 3 (LCMO) and Pr 0.5 Ca 0.5 MnO 3 (PCMO) grown on (001) oriented LaAlO 3 (LAO) [10]. In this article, we report the studies on the structure, magnetization and transport properties of the trilayer, where various thicknesses of LCMO layer sandwiched between two PCMO layers with different fixed thicknesses, simultaneously grown on (001) oriented LAO and SrTiO 3 (STO).…”

“…The details of optimized deposition conditions are described elsewhere [10,11]. The deposition rates of PCMO and LCMO were calibrated for each laser pulse of energy density ~ 3 J/cm 2 from the superlattices reflection in x-ray θ-2θ scans of the PCMO/LCMO superlattices.…”

Effect of electric/magnetic field on pinned/biased moments at the interfaces of magnetic superlattices

“…The magnetic structure based on 3d -transition metal compounds exhibit overdamped oscillatory exchange coupling [1,2,3], unidirectional magnetic anisotropy such as horizontal/vertical magnetic hysteresis loop shifts [4,5,6,7] and enhanced coercivity [8,9]. In antiferromagnetic(AFM)/ferromagnetic(FM) heterostructures the coercivity and unidirectional anisotropy are enhanced, in contrast to corresponding free magnetic multilayers.…”

“…In previous articles, the multilayer consisting of FM SrRuO 3 (SRO) and AFM SrMnO 3 (SMO) were grown to study the exchange coupling [6,7] at the interfaces of SRO and SMO.…”