Strain dependence of antiferromagnetic interface coupling inLa0.7Sr0.3MnO3/SrRuO3superlattices

Abstract

We have investigated the magnetic response of La0.7Sr0.3MnO3/SrRuO3 superlattices to biaxial in-plane strain applied in-situ. Superlattices grown on piezoelectric substrates of 0.72PbMg 1/3 Nb 2/3 O3-0.28PbTiO3(001) (PMN-PT) show strong antiferromagnetic coupling of the two ferromagnetic components. The coupling field of µ0HAF = 1.8 T is found to change by µ0 HAF / ε ∼ -520 mT % −1 under reversible biaxial strain ( ε) at 80 K in a [La0.7Sr0.3MnO3(22Å)/SrRuO3(55Å)]15 superlattice. This reveals a significant strain effect on interfacial coupling. The applied in-plane compression enhances the ferromagnetic order in the manganite layers which are under as-grown tensile strain, leading to a larger net coupling of SrRuO3 layers at the interface. It is thus difficult to disentangle the contributions from strain-dependent antiferromagnetic Mn-O-Ru interface coupling and Mn-O-Mn ferromagnetic double exchange near the interface for the strength of the apparent antiferromagnetic coupling. We discuss our results in the framework of available models.

Giant electric field tunable magnetic properties in a Co50Fe50/lead magnesium niobate–lead titanate multiferroic heterostructure

“…The polycrystalline CoFe ilms grown on PMN-PT are likely to be under weak tensile strain. When the compressive strain induced by the E-ield is applied it will partly release the tensile strain, which may result in stronger orbital hybridization between the atoms and thus stronger interfacial coupling [36]. For example, d orbital hybridization between Ti and Fe reported in the Fe/BaTiO 3 system [38] was enhanced when the E-ield was applied.…”

“…However, there may be another potential contribution from the strain effect on interfacial coupling [36] in a system based on orbital hybridization. In the CoFe/PMN-PT heterostructure, a large lattice mismatch (~28.9%) exists due to the distinct in-plane lattice parameters of a CoFe = 2.858 Å [37] and a PMN-PT = 4.021 Å [36]. The polycrystalline CoFe ilms grown on PMN-PT are likely to be under weak tensile strain.…”

Electric field-controlled magnetization in bilayered magnetic films for magnetoelectric memory

“…Here, we think the magnitude of the compressive strains along [100] and [010] should be different, which leads a total compressive strain along a sole direction. Therefore, the uniaxial anisotropy is induced by the biaxial compressed strains 25 with an estimated total compressive strain (D E ¼ À0.07% (Refs. 5 and 32)) along [100] at applied E-field of 6 kV/cm.…”

Low-temperature anomalous spin correlations and Kondo effect in ferromagnetic SrRuO3/LaNiO3/La0.7Sr0.3MnO3Ghosh1, Tanguturi2, Pramanik3 et al. 2019Phys. Rev. B19060View full textAdd to dashboardCite

“…In recent years, research on interfaces of ferromagnetic (FM) LaSrMnO 3 (LSMO) and SrRuO 3 (SRO) layers has attracted much attention because of the artificially induced antiferromagnetic coupling across the interface 24,25 . Unlike manganites, LaNiO 3 (LNO) is another interesting perovskite material which exhibits metallic behaviour with paramagnetic property [26][27][28] .…”